Total Solar Eclipse (Geography)
Total Solar Eclipse (Geography)
Total Solar Eclipse (Geography)
Why In News:
The total solar eclipses remain valuable scientific opportunities to study the Sun's corona, even as dedicated space missions now observe it continuously.
Source: The Indian Express, Explained Page, 13 August 2026, 'Total solar eclipse: The best time to study Sun's invisible part'
Eclipse Basics
A total solar eclipse occurs when the Moon completely covers the Sun's disc as seen from Earth, possible only during a New Moon when the Moon crosses the ecliptic plane.
Eclipses are classified as total, partial, annular, and hybrid, depending on alignment and distance.
Partial Eclipse: Only a part of the Sun or Moon is covered.
Annular Eclipse: The Moon appears smaller than the Sun, leaving a bright ring of sunlight around it.
Hybrid Eclipse: It appears total from some locations and annular from others due to Earth’s curvature and the Moon’s changing apparent size.
The Saros cycle describes the roughly 18-year, 11-day and 8 hours period after which eclipses of similar geometry recur.
Why the Corona Matters
During totality, the Sun's corona (outer atmosphere) becomes visible to the naked eye, otherwise hidden by the glare of the photosphere.
The corona's temperature runs into millions of kelvin, far hotter than the Sun's visible surface, a puzzle known as the coronal heating problem.
The corona drives space weather phenomena such as coronal mass ejections (CMEs) and the solar wind, which can disrupt satellites and power grids on Earth.
Coronal mass ejections (CMEs) are giant bubbles of plasma and intense magnetic fields expelled from the Sun's corona into space.
Key Facts for Prelims
India's Aditya-L1 mission, launched in September 2023, is stationed at the Lagrange Point 1 (L1), about 1.5 million km from Earth towards the Sun.
Aditya-L1 carries the Visible Emission Line Coronagraph (VELC), allowing continuous study of the corona without waiting for eclipses.
ISRO is the nodal agency for Aditya-L1, in coordination with premier institutes such as the Indian Institute of Astrophysics (IIA).
L1 is one of the five Lagrange points in the Sun-Earth system where gravitational forces allow a spacecraft to stay in a stable position.