Solar Flares in Varying Perspectives

Solar Flares in Varying Perspectives

. During the early impulsive phase of a solar flare, electrons accelerated to high energies and very rapid speeds emit radio bursts and hard X-rays. The radio emission is at frequencies from 100 to 3000 MHz, or at wavelengths between 3 and 0.1 meters; the hard X-rays have photon energies greater than 30 keV. The subsequent gradual phase is detected with soft X-rays, at energies of about 10 keV or less, as an aftereffect of the impulsive radiation. The soft X-rays are the thermal radiation, or bremsstrahlung, of a gas heated to temperatures of tens of millions of degrees.

Copyright 2010, Professor Kenneth R. Lang, Tufts University