Radio and X-ray observations of a multiple impulsive solar burst with high time resolution

Details Radio and X-ray observations of a multiple impulsive solar burst with high time resolution Radio and X-ray observations of a multiple impulsive solar burst with high time resolution

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...71...91k&link_type=abstract

Solar Physics, vol. 71, May 1981, p. 91-105.

Astronomy and Astrophysics

Astronomy

18

Electron Acceleration, Microwave Emission, Radio Astronomy, Solar Electrons, Solar Radio Bursts, Solar X-Rays, Microwave Spectra, Radio Interferometers, Radio Sources (Astronomy), Spikes, Type 3 Bursts

Scientific paper

A detailed comparison of three classes of emissions (microwave, X-ray, and type III) with a time resolution of approximately 0.5 sec reveals that individual type III bursts coincide in time with corresponding elementary X-ray and microwave spike bursts. This coincidence is considered to suggest that a nonthermal electron pulse generating a type III spike burst is produced simultaneously with those responsible for the corresponding hard X-ray and microwave spike bursts. The rise and decay characteristic time scales of the elementary spike burst are much less than 1 sec (for type III emissions), approximately 1 sec (for hard X-ray), and approximately 3 sec (for microwave). Radio interferometric observations made at 17 GHz show that the spatial structure varies between subgroups while it remains unchanged within a subgroup. It is noted that the spectral evolution of the microwave burst appears to be closely related to the spatial evolution. The spatial evolution, together with the spectral evolution, indicates that the electron-accelerating region shifts to a different location after it stays at one location for several tens of seconds, the duration of a subgroup of elementary spike bursts.

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