Herringbone bursts associated with type II solar radio emission.
Abstract
We report detailed observations of the herringbone (HB) fine structure on type II solar radio bursts. Data from the Culgoora radiospectrograph, radiometer and radioheliograph are analyzed. We determine the characteristic spectral profiles, frequency drift rates and exciter velocities, fluxes, source sizes, brightness temperatures, and polarizations of individual HB bursts. Correlations between individual bursts within the characteristic groups of bursts and the properties of the associated type II bursts are examined. Our data are compatible with HB bursts being radiation at multiples of the plasma frequency generated by electron streams accelerated by the type II shock. We conclude that HB bursts are physically distinct phenomena from type II and type III bursts, differing significantly in emission processes and/or source conditions; this conclusion indicates that many of the presently available theoretical ideas for HB bursts are incorrect.
- Publication:
-
Solar Physics
- Pub Date:
- September 1987
- DOI:
- 10.1007/BF00148526
- Bibcode:
- 1987SoPh..111..365C
- Keywords:
-
- Electron Beams;
- Plasma Frequencies;
- Solar Flares;
- Solar Radio Emission;
- Type 2 Bursts;
- Electromagnetic Radiation;
- Shock Waves;
- Solar Physics;
- Brightness Temperature;
- Radio Emission;
- Plasma Frequency;
- Source Condition;
- Characteristic Group;
- Solar Radio Bursts:Fine Structure