From UPSC perspective, the following things are important :
Prelims level: Aditya L1 Mission, CMEs
Why in the News?
India’s first solar mission, Aditya-L1, has made a significant scientific observation—a flareless Coronal Mass Ejection (CME) using the Visible Emission Line Coronagraph (VELC) Payload.
About Flareless Coronal Mass Ejection (CME)
- A Flareless CME is a solar eruption that occurs without an associated solar flare.
- Unlike typical CMEs, which are often linked to intense bursts of electromagnetic radiation, flareless CMEs result from magnetic instabilities in the solar corona without sudden energy releases.
Key Features of Flareless CMEs:
- No Solar Flare Trigger: Unlike most CMEs, they do not originate from an intense energy burst.
- Magnetic Instability Driven: Plasma ejection occurs due to internal rearrangements in the Sun’s magnetic field.
- Gradual Energy Release: These CMEs may expand more slowly compared to CME-flare events.
- Scientific Significance: Helps differentiate CME mechanisms from flare activities, improving space weather forecasts.
About the Aditya-L1 Mission
- Aditya-L1 is India’s first space-based observatory dedicated to solar studies.
- Launched by ISRO, it is positioned at Lagrange Point 1 (L1), about 1.5 million km from Earth.
- It takes 125 days to reach L1, where gravitational equilibrium allows continuous solar observation.
- It is India’s second space observatory after AstroSat (2015).
- Mission Objectives:
- Study the solar corona, photosphere, chromosphere, and solar wind dynamics.
- Monitor solar activity, flares, and CMEs to predict space weather events.
- Provide early warnings for geomagnetic storms affecting Earth’s satellites and power grids.
- Scientific Instruments:
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- Visible Emission Line Coronagraph (VELC): Observes the solar corona and tracks CMEs.
- Solar Ultraviolet Imaging Telescope (SUIT): Captures images of the Sun’s lower atmosphere.
- Solar Low Energy X-ray Spectrometer (SoLEXS): Measures soft X-ray emissions from the Sun.
- High Energy L1 Orbiting X-ray Spectrometer (HEL1OS): Detects high-energy solar X-rays.
- Aditya Solar Wind Particle Experiment (ASPEX): Studies solar wind particles and their impact on space weather.
- Plasma Analyser Package for Aditya (PAPA): Analyzes plasma properties in the solar wind.
- Magnetometer: Measures magnetic field variations at L1.
PYQ:[2022] If a major solar storm (solar flare) reaches the Earth, which of the following are the possible effects on the Earth ? 1. GPS and navigation systems could fail. 2. Tsunamis could occur at equatorial regions. 3. Power grids could be damaged. 4. Intense auroras could occur over much of the Earth. 5. Forest fires could take place over much of the planet. 6. Orbits of the satellites could be disturbed. Select the correct answer using the code given below: (a) 1 and 2 only (b) 3 and 4 only (c) 1, 3, 4 and 6 only (d) 2, 5 and 6 only |
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