[pib] Commercial Courts (Amendment) Bill, 2024

Prelims Only | Polity | Mains Paper 2: Statutory, Regulatory & Various Quasi-Judicial Bodies

Note4Students

From UPSC perspective, the following things are important:

Prelims level: Commercial Courts (Amendment) Bill, 2024

Why in the News?

The Ministry of Law and Justice is inviting comments on the draft Commercial Courts (Amendment) Bill, 2024.

The GoI has enacted and amended the Commercial Courts Act, 2015 to ensure that commercial cases are resolved quickly, effectively, and affordably.

Amendment History:
- The original Commercial Courts Act was enacted in 2015.
- Further amendments were made in 2018 to enhance the dispute resolution system.

Key features and provisions of the Commercial Courts (Amendment) Bill, 2024:

	Details
Purpose	To enhance the speed and efficiency of resolving commercial disputes through specialized courts and procedures.
Dedicated Commercial Courts	Creation of Commercial Courts at the District level and High Court level to exclusively handle commercial disputes.
Arbitration Matters	Provisions to establish specific courts for handling arbitration-related disputes.
Electronic Communication	Includes provisions for the use of audio-video electronic means (video conferencing) for court proceedings, recording of evidence, and communications.
Pre-Institution Mediation	Mandatory mediation before filing a commercial suit, unless urgent relief is required, aimed at reducing litigation burden.
Time-bound Decisions	Judgment must be pronounced within 60 days of the conclusion of arguments. The judgment must be delivered to the parties via email or other electronic means.
Injunction Applications	Courts must dispose of injunction applications within 90 days of filing, with reasons provided for any delay.
Infrastructure	Provisions for setting up infrastructure like video conferencing facilities and other necessary resources for the functioning of Commercial Courts.
Appeals Process	New provisions for expediting appeals, requiring prior notice to the opposing party before filing.
Witness Management	Provisions to streamline the witness list format, requiring comprehensive details, including addresses and documents, and facilitating electronic submission.
Execution Proceedings	Execution proceedings must be disposed of within six months from the date of filing the application.

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Animal Husbandry, Dairy & Fisheries Sector – Pashudhan Sanjivani, E- Pashudhan Haat, etc

Project to monitor animal health launched

Prelims Only | Enviro & Biodiversity | Mains Paper 3: Economics Of Animal-Rearing

Note4Students

From UPSC perspective, the following things are important:

Mains level: Climate Change Impacts; Action related to Pandemic;

Why in the News?

The Union Minister of Fisheries, Animal Husbandry, and Dairying launched the ‘Animal Health Security Strengthening in India for Pandemic Preparedness and Response’ initiative in New Delhi.

What is the primary aim of the Animal Health Security Project?

The Animal Health Security Project aims to strengthen India’s capacity to prevent, detect, and respond to animal health threats, reducing zoonotic disease risks through enhanced surveillance, laboratory systems, and regional collaboration.

What are the objectives of the Animal Health Security Project?

Prevention, Detection, and Response: Enhance India’s ability to prevent, detect, and respond to animal health threats, minimizing risks of pathogens transmitting from animals to humans.
Strengthen Surveillance Systems: Improve and integrate animal disease surveillance and early warning systems to promptly identify potential threats.
Laboratory and Vaccine Infrastructure: Upgrade and expand laboratory networks and vaccine manufacturing facilities to ensure preparedness.
Data Systems and Analytics: Strengthen interoperable data systems and analytics capabilities to support informed decision-making and risk communication.
Cross-Border Collaboration: Promote regional cooperation for transboundary animal disease control through cross-border collaborations.

How is the project funded and what is its timeline?

The project is funded by the Pandemic Fund established by the G20 countries, which aims to help low- and middle-income countries improve their pandemic preparedness.
- The fund’s first round raised $2 billion, and India’s project received a $25 million grant.
The project will be implemented by the Asian Development Bank (ADB), the World Bank, and the Food and Agriculture Organization (FAO).
Timeline: Expected to conclude by August 2026.

Why is this project necessary for India?

Zoonotic Disease Threat: About two-thirds of infectious diseases in humans are zoonotic (transmitted from animals), with recent examples including COVID-19. India’s large population of 536 million livestock makes it vulnerable to zoonotic outbreaks.
Public Health Impact: With five of the six major global public health emergencies in recent decades being zoonotic, the project is crucial for India’s pandemic prevention and public health security.
Vulnerable Population Protection: By addressing animal health threats, the project aims to protect the health, nutritional security, and livelihoods of vulnerable populations reliant on livestock.

Way forward:

Strengthen Coordination Across Sectors: Enhance collaboration between animal health, public health, and environmental sectors to create an integrated response to zoonotic threats, ensuring swift data sharing and response mechanisms.
Sustain Capacity Building and Infrastructure Investments: Ensure continued investment in laboratory networks, vaccine production, and training to maintain preparedness, and bolster resilience against emerging animal-to-human diseases beyond the project’s timeline.

Mains PYQ:

Q COVID-19 pandemic has caused unprecedented devastation worldwide. However, technological advancements are being availed readily to win over the crisis. Give an account of how technology was sought to aid management of the pandemic. (UPSC IAS/2020)

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Innovations in Sciences, IT, Computers, Robotics and Nanotechnology

How climate change is bringing back the idea of Airships?

Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

Note4Students

From UPSC perspective, the following things are important:

Prelims level: Airships

How climate change is bringing back the idea of Airships?

Why in the News?

Some companies have been working to solve the buoyancy challenge of Airships, a longstanding issue that has hindered their use for cargo transportation.

What are Airships?

Airships are lighter-than-air aircraft capable of controlled powered flight.
They were the first aircraft to achieve this and were considered the future of travel in the early 20th century.
However, as aeroplane technology advanced, the popularity of airships declined due to their technological limitations.
Today, airships are used mainly for:
- Advertising platforms
- Aerial observation for research and military purposes
- Tourism and scenic flights

Note: Buoyancy is the force that makes things float. It acts in the opposite direction to gravity. When an object is placed in a fluid (like air or water), the fluid pushes up against the object, helping it to stay afloat.

How do Airships work?

Airships achieve lift by using lighter-than-air gases within their structure, much like helium balloons.
Early airships used hydrogen due to its lightweight and low cost.
- However, hydrogen is highly flammable, leading to tragic incidents such as the Hindenburg disaster of 1937, which damaged public trust in airships.
Most airships today use helium, a non-flammable gas that is safer than hydrogen.
However, helium is scarce and expensive, costing about $35 per cubic meter (enough to lift just 1 kg).
Challenge with varying Buoyancy:
- Airships require the ability to vary their buoyancy to adjust for weight changes when picking up or dropping off loads.
- Solutions such as releasing and refilling helium are impractical due to helium’s high cost and scarcity.

How Airships are a Promising Solution?

Airships hold potential as low-emission cargo vehicles due to their unique design:

Airships have a high lift-to-drag ratio, meaning they consume far less fuel than aeroplanes for moving the same load.
Companies are exploring the use of ballast to regulate airship buoyancy, a method common in hot air balloons and submarines.
A French company has created a 200-meter “flying crane” airship called LCA60T, which can pick up water as ballast mid-flight, avoiding the need for specialized ground infrastructure.
With concerns about climate change and the aviation industry’s carbon footprint, airships offer a less polluting alternative. They do not burn fossil fuels to lift, making them an eco-friendly choice.

PYQ:

[2017] Examine the development of Airports in India through joint ventures under Public–Private Partnership (PPP) model. What are the challenges faced by the authorities in this regard?

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Foreign Policy Watch: India-Africa

Horn of Africa

Prelims Only | International Relations | Mains Paper 2: Important International Institutions

Note4Students

From UPSC perspective, the following things are important:

Prelims level: Horn of Africa and adjacent region

Horn of Africa

Why in the News?

According to a joint report by the UN and the Intergovernmental Authority on Development (IGAD), at least 65 million people are food insecure in the Horn of Africa.

Food Insecurity in Horn of Africa Region:

Of the 65 million affected, 36 million reside in IGAD member states: Djibouti, Eritrea, Ethiopia, Kenya, Somalia, South Sudan, Sudan, and Uganda.

Main Causes:

Extreme weather and climate change are primary drivers of food insecurity, leading to severe conditions.
Conflict has also destroyed infrastructure and sources of food and income, worsening the situation.

About the Horn of Africa:

	Details
Location	A peninsula in northeastern Africa, extending into the Arabian Sea.
Geographical Composition	Comprises the countries of Djibouti, Eritrea, Ethiopia, and Somalia.
Population	Approximately 115 million people.
Area	Covers about 2 million square kilometers.
Geographical Features	Includes mountains, plateaus, deserts, and coastlines. Significant areas include the Ethiopian Plateau, Ogaden Desert, and Eritrean and Somalian coasts.
Historical Name	Known as Bilad al Barbar or Berber Land in ancient times.
Significance	Known for diverse landscapes and unique biodiversity. Strategic importance due to proximity to oil-producing regions in the Middle East.
Key Bodies of Water	Lies to the south of the Gulf of Aden and along the southern boundary of the Red Sea. Grand Renaissance Dam: Under construction by Ethiopia on the Nile River, impacting regional water dynamics.
Shipping Routes	Major shipping routes pass through the Red Sea, with Djibouti serving as a critical maritime hub for international trade.
Climate	Characterized by a mix of arid, semi-arid, and temperate climates, influencing agriculture and livelihoods in the region.

Geopolitical and strategic importance for India:

The Horn of Africa is located near the Middle East, a region vital for global oil production.
- Around 40% of Middle Eastern oil flows through the Red Sea shipping lanes adjacent to the Horn, making it a critical point for energy security.
Djibouti and the surrounding areas control access to the Bab el Mandeb Strait, which links the Red Sea to the Gulf of Aden and is one of the world’s busiest maritime chokepoints.
Several countries, including the US, France, and China, have established military bases in Djibouti to secure their interests in this strategic region.
China’s presence in Djibouti and other Horn of Africa nations aligns with its “string of pearls” strategy, which aims to secure military and economic footholds around India.
The Horn region serves as a gateway to Africa for Indian investments in infrastructure, energy, and mining sectors.
The region, particularly Somalia, poses threats from Pirates and terrorist groups like Al-Shabaab.

PYQ:

[2016] Consider the following statements:

The India-Africa Summit
held in 2015 was the third such Summit
was actually initiated by Jawaharlal Nehru in 1951

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

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ISRO Missions and Discoveries

Europe’s Proba-3 Mission to arrive in India

Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

Note4Students

From UPSC perspective, the following things are important:

Prelims level: Proba-3 Mission

Europe's Proba-3 Mission to arrive in India

Why in the News?

India is set to launch the European Space Agency’s (ESA) PROBA-3 Mission in December from the Sriharikota spaceport.
- The mission will use ISRO’s PSLV rocket to place two satellites in orbit, designed to study the Sun’s corona, or outer atmosphere.

About Proba-3 Mission:

	Details
Mission Name	PROBA-3 (Project for On-Board Autonomy-3)
Objective	Study the Sun’s corona by creating an artificial eclipse with precision formation flying of two satellites
Launch Date and Location	December 4, 2024, from Sriharikota spaceport, India, via ISRO’s PSLV-XL rocket
Orbit	Highly elliptical orbit, ranging from 600 km to 60,000 km, with a 19.7-hour orbital period
Satellites	Two satellites: Coronagraph spacecraft (340 kg) and Occulter spacecraft (200 kg)
Alignment Precision	Millimeter-level alignment to block the Sun’s light and allow continuous corona observation
Key Scientific Goals	Observe solar phenomena, such as solar flares and coronal mass ejections, to improve space weather forecasting
Unique Features	First ESA mission dedicated to precision formation flying, using smaller, agile satellites for cost-effective observation
International Collaboration	Jointly developed by ESA and ISRO, with contributions from France, Belgium, and the Netherlands
Communication Support	Managed via antenna in Santa Maria (Azores) and ground station in Redu (Belgium)
Significance	Advances solar research and international collaboration; enhances space weather insights, supporting infrastructure on Earth

PYQ:

[2016] What is ‘Greased Lightning-10 (GL-10)’, recently in the news?

(a) Electric plane tested by NASA

(b) Solar-powered two-seater aircraft designed by Japan

(d) Reusable rocket designed by ISRO

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Innovations in Biotechnology and Medical Sciences

How Vitamin D deficiency can trigger autoimmune conditions?

Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

Note4Students

From UPSC perspective, the following things are important:

Prelims level: Autoimmune Conditions, Vitamin D

Why in the News?

Recent research conducted by scientists at McGill University has shed light on the critical role of vitamin D in maintaining thymus health and its implications for immune function.

About Autoimmune Conditions:

Autoimmune conditions refer to disorders where the immune system mistakenly attacks the body’s own healthy tissues, viewing them as foreign.
Vitamin D plays a role in regulating immune responses and promoting immune tolerance—the body’s ability to avoid attacking its own cells.
It influences T-cells (a type of immune cell) to recognize and tolerate the body’s own tissues rather than attacking them.
The thymus gland trains T-cells to avoid attacking healthy cells. A deficiency in Vitamin D may cause the thymus to age prematurely, reducing its ability to regulate T-cells properly.
- Vitamin D affects certain genetic pathways related to immune function.
- Variations in the vitamin D receptor (VDR) gene may also predispose some individuals to autoimmune diseases, and these individuals might be more sensitive to Vitamin D levels.

What is Vitamin D?

Vitamin D is a fat-soluble vitamin crucial for the body’s ability to absorb calcium, magnesium, and phosphate, which are essential for bone health.
It supports muscle movement, nerve function, and immune system responses. Due to its synthesis in the skin upon exposure to sunlight, it is often called the ‘sunshine vitamin’.
The body naturally produces Vitamin D when skin is exposed to ultraviolet B (UVB) rays from sunlight.
Sources of Vitamin D:
- Fish: Salmon, mackerel, tuna, and sardines are rich in Vitamin D.
- Cod liver oil: A concentrated source, providing 400–1,000 IU per teaspoon.
- Mushrooms: Varieties like portobello contain Vitamin D if exposed to UV light.
- Fortified Foods: Milk, yogurt, orange juice, and cereals often have added Vitamin D.
- Egg yolks: Contain a small amount of Vitamin D.
- Common forms include Vitamin D2 (ergocalciferol) and Vitamin D3 (cholecalciferol), especially useful in autumn and winter when sunlight exposure is limited.

Significance of Vitamin D

Bone Health: Essential for calcium absorption, which strengthens bones and prevents osteoporosis.
Muscle and Nerve Function: Supports muscle contractions and nerve signaling between the brain and body.
Immune System: Enhances immune defenses, helping to fight off infections by viruses and bacteria.
Brain Health: May play a role in maintaining cognitive health, especially with aging.
Inflammation and Pain: Helps regulate the body’s response to inflammation and pain.
Blood Pressure: Linked to regulating blood pressure; deficiency is associated with hypertension.

Impacts of Vitamin D Deficiency

Increases the risk of rickets in children (softening of bones) and osteoporosis in adults.
Low levels of Vitamin D are linked to autoimmune conditions like rheumatoid arthritis, lupus, and multiple sclerosis.
Recent studies indicate that Vitamin D deficiency can accelerate thymus aging, leading to immune dysfunction and a higher risk of autoimmune diseases.
Deficiency has been associated with cancer, cardiovascular disease, diabetes, depression, and chronic pain.
Can include fatigue, muscle weakness, bone pain, and depression.
In severe cases, deficiency may cause impaired bone growth and fracture susceptibility.

PYQ:

[2011] Regular intake of fresh fruits and vegetables is recommended in the diet since they are a good source of antioxidants. How do antioxidants help a person maintain health and promote longevity?

(a) They activate the enzymes necessary for vitamin synthesis in the body and help prevent vitamin deficiency.

(b) They prevent excessive oxidation of carbohydrates, fats and proteins in the body and help avoid unnecessary wastage of energy.

(d) They activate certain genes in the cells of the body and help delay the ageing process.

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Animal Husbandry, Dairy & Fisheries Sector – Pashudhan Sanjivani, E- Pashudhan Haat, etc

[pib] Development of Tuna Cluster in Andaman and Nicobar Islands

Prelims Only | Agriculture | Mains Paper 3: Economics Of Animal-Rearing

Note4Students

From UPSC perspective, the following things are important:

Prelims level: Tuna Fish, PMMSY

Why in the News?

The Department of Fisheries has notified the creation of a Tuna Cluster in the Andaman and Nicobar Islands as part of the Pradhan Mantri Matsya Sampada Yojana (PMMSY).

The A&N Islands offer significant opportunities for fisheries development with approximately 6.0 lakh square km of Exclusive Economic Zone (EEZ).
This region has rich sea resources, particularly Tuna and Tuna-like species, with an estimated potential of 60,000 metric tons.
The islands’ location near Southeast Asia enables efficient sea and air trade, and the pristine waters support sustainable fishing.

About Tuna Species and its Significance

Tuna are large, fast-swimming fish belonging to the Thunnini tribe within the Scombridae family.
Known for their streamlined bodies and remarkable agility, tuna are found in tropical and temperate oceans worldwide.
There are over 15 species of tuna, with some of the most well-known being Bluefin, Yellowfin, Albacore, Bigeye, and Skipjack.
Tuna can grow quickly and live for several decades, with species like Bluefin reaching over 450 kg in weight.
It is one of the most popular and valuable fish in the global seafood market, highly sought after for its flavor, texture, and nutritional value.
Species like Bluefin tuna are particularly valuable, often fetching high prices in markets, especially in Japan for dishes like sushi and sashimi.
It is rich in protein, low in saturated fat, and packed with omega-3 fatty acids, which support heart health, brain function, and inflammation reduction.
It also provides essential vitamins and minerals like Vitamin D, B12, iron, and selenium.

PYQ:

[2013] The most important fishing grounds of the world are found in the regions where

(a) Warm and cold atmospheric currents meet

(b) Rivers drain out large amounts of freshwater into the sea

(d) Continental shelf is undulating

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Festivals, Dances, Theatre, Literature, Art in News

Jagannath Puri Temple

Prelims Only | History | Mains Paper 1: Arts & Culture

Note4Students

From UPSC perspective, the following things are important:

Prelims level: Jagannath Puri Temple

Why in the News?

Odisha’s law minister recently clarified that there was no secret chamber inside the treasury of the Jagannath Temple in Puri.

About Jagannath Puri Temple

The Jagannath Temple is an important Vaishnavite temple dedicated to Jagannath, a form of Sri Krishna in Puri in Odisha.
The present temple was rebuilt from the 10th century onwards, on the site of an earlier temple, and begun by Anantavarman Chodaganga Deva, the first king of the Eastern Ganga dynasty.
The Puri temple is famous for its annual Ratha Yatra, or chariot festival, in which the three principal deities are pulled on huge and elaborately decorated temple cars.

It’s Architecture:

With its sculptural richness and fluidity of the Oriya style of temple architecture, it is one of the most magnificent monuments of India.
The huge temple complex covers an area of over 400,000 square feet and is surrounded by a high fortified wall.
This 20 feet high wall is known as Meghanada Pacheri.
Another wall known as kurma bedha surrounds the main temple.

The temple has four distinct sectional structures, namely:

Deula, Vimana or Garba griha (Sanctum sanctorum) where the triad deities are lodged on the ratnavedi (Throne of Pearls). In Rekha Deula style;
Mukhashala (Frontal porch);
Nata mandir/Natamandapa, which is also known as the Jagamohan (Audience Hall/Dancing Hall), and
Bhoga Mandapa (Offerings Hall)

PYQ:

[2012] The Nagara, the Dravida and the Vesara are the:

(a) Three main racial groups of the Indian subcontinent

(b) Three main linguistic divisions into which the languages of India can be classified

(d) Three main musical Gharanas prevalent in India

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Festivals, Dances, Theatre, Literature, Art in News

First Asian Buddhist Summit

Prelims Only | History | Mains Paper 1: Arts & Culture

Note4Students

From UPSC perspective, the following things are important:

Prelims level: First Asian Buddhist Summit

Why in the News?

The Government of India, in collaboration with the International Buddhist Confederation (IBC), held the first Asian Buddhist Summit (ABS) in New Delhi.

About the Asian Buddhist Summit (ABS)

ABS is a high-level conference organized to bring together Buddhist leaders, scholars, and practitioners from across Asia.
The theme of the first summit was ‘Role of Buddha Dhamma in Strengthening Asia’.
It aligns with India’s Act East Policy, aiming to deepen cultural and spiritual ties across Asian nations.
Key topics discussed at the summit include:
- The role of Buddhist art, architecture, and heritage.
- The dissemination of Buddha Dhamma and its cultural influence across Asia.
- The significance of holy Buddhist relics and their societal impact.
- The relevance of Buddhist philosophy and literature in the 21st century.
- Exploring the relationship between Buddhism and scientific research for health and well-being.

About Buddhism:

	Details
Origin of Buddhism	• Originated in India over 2,600 years ago. • Founded by *Siddhartha Gautama (the Buddha)* around 563 BCE. • Born into the royal family of the *Sakya clan* in Lumbini, near the Indo-Nepal border. • At age 29, Gautama renounced a life of luxury and embraced *asceticism.* • Attained Bodhi (enlightenment) after 49 days of meditation under a pipal tree in Bodhgaya, Bihar. • Delivered his first sermon in Sarnath, known as Dharma-Chakra-Pravartana. • Died at 80 in Kushinagara (Mahaparinirvana) in 483 BCE.
Tenets of Buddhism	• Advocated the Madhyam Marg (Middle Path) between indulgence and asceticism. • Emphasized individual responsibility for happiness. • Four Noble Truths (ariya-sachchani): 1. Dukkha: Suffering is inherent. 2. Samudya: Every suffering has a cause. 3. Nirodha: Suffering could be extinguished. 4. Atthanga Magga: Achieved through the Eightfold Path. • Eightfold Path (astangika marg): Right view, intention, speech, action, livelihood, mindfulness, effort, concentration. • Ultimate goal: Attaining Nirvana (Nibbana). • Five Precepts (Panchasil): Prohibitions against violence, stealing, sexual misconduct, lying, and intoxicants.
Major Buddhist Texts	• Initially oral teachings, memorized by the Sangha. • Written down around 25 BCE in Pali. • Three Pitakas: 1. Vinaya Pitaka: Monastic rules. 2. Sutta Pitaka: Main teachings, divided into five Nikayas (Digha, Majjhima, Samyutta, Anguttara, Khuddaka). 3. Abhidamma Pitaka: Philosophical analysis of teachings. • Other important texts: Divyavadana, Dipavamsa, Mahavamsa, Milind Panha.
Role of the Buddhist Councils	• Important turning points in early Buddhism, leading to sectarian clashes and the Great Schism. • Four Major Councils: 1. First Council (483 BCE): Presided by Mahakasyapa, aimed to preserve teachings. 2. Second Council (383 BCE): Addressed monastic discipline. 3. Third Council (250 BCE): Under Ashoka, focusing on spreading Buddhism. 4. Fourth Council (72 CE): Led to division into Mahayana and Hinayana.
Different Schools of Buddhism	• Mahayana: “Great Vehicle,” emphasizes Bodhisattva ideal and idol worship; spread to Central and East Asia. • Hinayana: “Lesser Vehicle,” focuses on individual salvation and original teachings; Theravada is a major branch. • Theravada: Closest to original teachings; dominant in Cambodia, Laos, Myanmar, Sri Lanka, and Thailand. • Vajrayana: “Vehicle of the Thunderbolt,” complex rituals; developed around 900 CE. • Zen: Focuses on meditation, developed in China and Japan.
Spread of Buddhism in Ancient India	• Monastic organization through Sangha for spreading teachings. • Rapid growth during Buddha’s lifetime. • Ashoka’s influence post-Kalinga conquest; adopted Dhamma conquest, sending missions to various regions, including Gandhara, Kashmir, Greece, Sri Lanka, Burma (Myanmar), Egypt, and Thailand.

PYQ:

[2020] With reference to the religious history of India, consider the following statements:

1. Sthaviravadins belong to Mahayana Buddhism.

2. Lokottaravadin sect was an offshoot of Mahasanghika sect of Buddhism.

3. The deification of Buddha by Mahasanghikas fostered the Mahayana Buddhism.

Which of the statements given above is/are correct?

(a) 1 and 2 only

(b) 2 and 3 only

(d) 1, 2 and 3

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ISRO Missions and Discoveries

Does the Sun rotate?

Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

Note4Students

From UPSC perspective, the following things are important:

Prelims level: Sun’s Rotation

sun

Why in the News?

Indian astronomers at the Kodaikanal Solar Observatory (KSO) have achieved a groundbreaking feat by mapping, for the first time, the variation in the Sun’s rotation speed from its equator to its poles.

Sun’s Rotation: Key Facts

Unlike a solid body, the Sun exhibits differential rotation, meaning different parts of the Sun rotate at different speeds.
The rotation speed varies depending on latitude, with faster rotation near the equator and slower rotation toward the poles.
This variation is primarily due to the Sun’s composition of gaseous plasma rather than solid material.

Rotation Period Variation by Latitude:

Equatorial Regions: The rotation period at the equator is the fastest, around 24.47 days (sidereal rotation).
Sunspot Zones (about 16 degrees latitude): Rotation slows slightly, with a period of about 27.3 days.
Higher Latitudes (up to 75 degrees): Rotation slows significantly; for example, at 75 degrees latitude, the rotation period is about 33.4 days.
Poles: The slowest rotation occurs at the poles, with a period around 31.1 days.

Sidereal vs. Synodic Rotation Periods:

Sidereal Rotation Period: The time taken for the Sun to complete one full rotation relative to distant stars. It varies by latitude, from 24.47 days at the equator to around 33.4 days at higher latitudes.
Synodic Rotation Period: This is the time for a fixed feature on the Sun to appear in the same position when observed from Earth. It is longer than the sidereal period due to Earth’s own movement around the Sun, averaging around 26.24 days.

Why Differential Rotation Occur?

Gaseous Plasma Composition: The Sun is composed of plasma—a hot, ionized state of matter—which allows its different regions to rotate at different speeds.
Convective Zone Dynamics: The outer convective layer of the Sun contributes to differential rotation. Plasma circulates, rising and sinking, which influences the rotational speed at different latitudes.

Scientific Implications

Solar Dynamo Theory: The differential rotation of the Sun is central to theories about the solar dynamo—the process that generates the Sun’s magnetic field.
Mystery of Differential Rotation: Despite extensive research, the exact mechanism behind the Sun’s differential rotation remains an active area of investigation in solar physics.

PYQ:

[2013] Consider the following phenomena

1. Size of the sun at dusk

2. Colure of the sun at dawn

3. Moon being visible at dawn

4. Twinkle of stars in the sky

5. Polestar being visible in the sky

Which of the above are optical illusions?

(a) 1, 2 and 3

(b) 3, 4 and 5

(d) 2, 3 and 5

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Type: Prelims Only

Why in the News?

Key features and provisions of the Commercial Courts (Amendment) Bill, 2024:

Why in the News?

What is the primary aim of the Animal Health Security Project?

What are the objectives of the Animal Health Security Project?

How is the project funded and what is its timeline?

Why is this project necessary for India?

Way forward:

Mains PYQ:

Why in the News?

What are Airships?

How do Airships work?

How Airships are a Promising Solution?

PYQ:

Why in the News?

Food Insecurity in Horn of Africa Region:

About the Horn of Africa:

Geopolitical and strategic importance for India:

PYQ:

Why in the News?

About Proba-3 Mission:

PYQ:

Why in the News?

About Autoimmune Conditions:

What is Vitamin D?

Significance of Vitamin D

Impacts of Vitamin D Deficiency

PYQ:

Why in the News?

About Tuna Species and its Significance

PYQ:

Why in the News?

About Jagannath Puri Temple

It’s Architecture:

The temple has four distinct sectional structures, namely:

PYQ:

Why in the News?

About the Asian Buddhist Summit (ABS)

About Buddhism:

PYQ:

Why in the News?

Sun’s Rotation: Key Facts

Rotation Period Variation by Latitude:

Sidereal vs. Synodic Rotation Periods:

Why Differential Rotation Occur?

Scientific Implications

PYQ: