Full Breakdown
New Solar Corona Insights from India’s Aditya-L1 Mission
8/15/2026, 1:37:38 AM
Scientific Context of the Coronal Heating Problem
The Sun’s outer atmosphere, the corona, reaches temperatures of about 2 million °C and can spike to 40 million °C—far hotter than the 5,500 °C photosphere visible from Earth. This disparity, known as the coronal heating problem, has long puzzled astrophysicists because it appears to defy basic thermodynamic expectations. The corona also launches solar flares and coronal mass ejections (CMEs), which can generate auroras and, during intense events, disrupt power grids and satellite communications on Earth.
Key Findings and Quantitative Details
Researchers led by Prof R Ramesh of the Indian Institute of Astrophysics (IIA) analyzed data from Aditya-L1, India’s first solar-observation spacecraft. Their recent paper in *Astrophysical Journal Letters* reports that temperature variations across different solar regions suggest a previously unidentified mechanism that sustains the corona’s extreme heat despite the energy loss associated with frequent CMEs. In low-activity periods the Sun emits two to three CMEs per day; during the peak of the 11-year solar cycle this can rise to ten or more daily.
Official Commentary
Prof Ramesh emphasizes that, although each CME expels a large amount of solar energy, the Sun does not cool catastrophically because the corona somehow replenishes the lost heat. He argues that without such a mechanism the Sun would eventually exhaust its energy, leading to a permanent deep freeze on Earth.
Verbatim Quotes
- “Now if the Sun is losing such huge amounts of energy with each CME and it's not replenished, the star at the centre of our solar system would lose all its energy and Earth would plunge into an irreversible deep freeze,” — Prof Ramesh, of the Indian Institute of Astrophysics (IIA)
