Site of Radio Burst

Site of Radio Burst

. Electrons are rapidly accelerated just above the tops of coronal loops during the early stages of the flare, emitting the powerful loop-like radio signals mapped here with white contours. The underlying hydrogen-alpha (Ha) emission is shown in the accompanying photographs. These 10-second snapshot radio maps were obtained with the Very Large Array (VLA) at a wavelength of 20 centimeters, or a frequency of 1,420 MHz. The angular extent of each 20-cm flaring loop is about one minute of arc, or one thirtieth of the angular width of the visible solar disk. (Courtesy of Ken Lang.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University