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Tiny flashes of radio light emanating from the sun discovered

Part of: GS-Prelims and GS-III – Space

In News:

A group of scientists working at the Pune-based National Centre for Radio Astrophysics (NCRA) have recently discovered tiny flashes of radio light emanating from all over the sun.
These flashes could help in explaining the long-pending coronal heating problem.

Important value additions

Coronal heating problem

The solar corona is the outer layer of the Sun’s atmosphere.
It is composed of extremely high temperature gas, known as plasma
Its temperature could reach upto millions of degrees Celsius.
It is farthest from the core where the nuclear reactions powering the Sun occur.
It would logically be expected to be the coolest part of the Sun.
However, corona is 200 times hotter than the photosphere which is the layer beneath it.
This contradiction is dubbed as the coronal heating problem.
It has puzzled astrophysicists ever since the temperature of the corona was first measured over 70 years ago.

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