Kodaikanal Solar Observatory provides valuable insights into the Solar Cycle | Current Affairs | Vision IAS

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In Summary

  • Supergranulations, giant convection cells on the Sun's surface, respond to solar cycles, aiding prediction.
  • The ~11-year solar cycle involves magnetic field flips, phases of solar minimum and maximum, and phenomena like sunspots, solar flares, and CMEs.
  • Kodaikanal Solar Observatory, established in 1899 in Tamil Nadu, studies solar heating of Earth's atmosphere and monsoon patterns.

In Summary

It uncovered how supergranulations respond to solar cycles, aiding cycle prediction.

  • Supergranulations are giant convection cells (or patterns) that form a vast network structure on the surface of the Sun.

About Solar Cycle 

  • The solar cycle is a periodic rhythm of magnetic activity that Sun undergoes every ~11 years.
    • Mechanism: The Sun is composed of electrically charged gas (plasma) that generates a massive magnetic field. 
    • Every 11 years, this field undergoes a flip (north-south poles switch)
  • This periodic cycle undergoes distinct phases:
    • Solar Minimum: Cycle begins at solar minimum (low activity and few sunspots)
      • Sunspots: Dark, cooler regions on the Sun caused by strong magnetic activity.  
      • Despite being cooler, more sunspots correlate with the Sun emitting more total energy.
  • Solar Maximum: As activity builds toward solar maximum, Sun becomes "stormy," featuring the highest number of sunspots and frequent eruptions. 
  • Impact on Space Weather: During the more active phases, the Sun also experiences an increase in giant eruptions, such as solar flares and coronal mass ejections (CMEs)
    • Solar Flares: Sudden bursts of X-rays and radiation (travelling at speed of light) caused by release of magnetic energy in sunspot regions. 
    • CMEs: Massive bubbles of plasma and magnetic fields flung into space
    • Impact: They can disrupt power grids, navigation systems, radio communications, and satellite operations, affect astronauts, induce geomagnetic storms affecting magnetic fields and events like Auroras etc.

About Kodaikanal Solar Observatory 

  • Established in 1899 and subsumed then Madras Observatory.
  • Aim: to obtain data on how Sun heats up Earth’s atmosphere and to understand monsoon patterns.
  • Location: under Indian Institute of Astrophysics and is located in Palani range (Tamil Nadu)
    • Chosen for its proximity to equator and its dust-free high-altitude location.
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Indian Institute of Astrophysics

An autonomous research institution under the Department of Science and Technology, Government of India, dedicated to research in astronomy and astrophysics, overseeing observatories like the Kodaikanal Solar Observatory.

Kodaikanal Solar Observatory

A solar observatory located in Tamil Nadu, established in 1899, and currently operational. It is one of India's existing solar research facilities.

Geomagnetic Storms

Disturbances in Earth's magnetosphere caused by the interaction of solar wind, often amplified by CMEs. These storms can impact satellites, power grids, navigation systems, and radio communications. Understanding these is crucial for disaster preparedness and technological resilience.

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