Type II Solar Radio Bursts
Abstract
Solar radio bursts of type II are thought to be caused by MHD shock waves propagating through the corona and interplanetary medium. They are identified as slowly drifting features in the dynamic spectra recorded by ground based and spaceborne radio instruments. The radio emission itself occurs as a final step in a series of physical processes: initiation of the shock, particle acceleration, generation of plasma waves and finally, conversion of the plasma waves into electromagnetic waves. Type II bursts play an important role in understanding the Sun-Earth connection, because of their association with flares and coronal mass ejections (CMEs). Images of type II bursts made by radioheliographs are crucial to understand the physical relationship between shocks, CMEs and solar flares. Observations of a new type of coronal waves by the EIT instrument on board the SOHO mission and long-decametric and hectometric type II bursts by the WIND/WAVES experiment have added new dimensions to the study of type II radio bursts. In this review, I summarize the basic properties and associated solar activities of type II bursts and discuss some of the current issues.
- Publication:
-
Geophysical Monograph Series
- Pub Date:
- 2000
- DOI:
- 10.1029/GM119p0123
- Bibcode:
- 2000GMS...119..123G