Sunday, April 05, 2009

Coronal Heating Problem

The temperature at surface of the sun is about 5800K, but the temperature of solar corona is millions of degrees kelvin. Why is the corona so hot? We don't yet know.
a solar coronal loop
The corona is a source for solar storms, in particular coronal mass ejections. The most powerful such storm on record was the solar storm of 1859.
Currently the sun is unusually quiet: Deep Solar Minimum.

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