Solar Radio Bursts

Solar Radio Bursts

. A large solar flare can be associated with several different kinds of intense radio emission, depending of the frequency (left vertical axis) and time after the explosion (bottom axis). The impulsive, or flash, phase of the solar flare, starting at 0 hours, normally lasts about 10 minutes and is associated with a powerful microwave burst. Dynamic spectra at frequencies of about 108 Hz, show type II and type III bursts that drift from high to low frequencies as time goes on, but at different rates depending on the type of burst. The height scale (right vertical axis) is in units of the Sunís radius of 696 million meters; it is the height at which the coronal electron density yields a plasma frequency corresponding to the frequency on the left-hand side.

Copyright 2010, Professor Kenneth R. Lang, Tufts University