Metric spikes and electron acceleration in the solar corona.

Details Metric spikes and electron acceleration in the solar corona. Metric spikes and electron acceleration in the solar corona.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309..291b&link_type=abstract

Astronomy and Astrophysics, v.309, p.291-300

Astronomy and Astrophysics

Astrophysics

29

Sun: Flares, Sun: Radio Radiation, Sun: Particle Emission

Scientific paper

Short and narrowband spikes near the starting frequency of metric type III bursts have been searched and analyzed in Zurich radio spectrometer data. We find that the probability for the occurrence of metric spikes is related to the starting frequency of type III bursts; the association rate increases to 34% for groups of type III bursts with starting frequencies below 500MHz. The frequency channel containing most of spikes has been cross-correlated in time with the frequency channels of type III bursts. The correlation is significant in all selected cases and is caused by the association of individual type III bursts with groups of spikes, proving beyond doubt that spikes and type III bursts are physically related. The cross-correlation also defines the average drift rate of the type III maximum and its relation to spikes. In the average, the peak time of metric spikes coincides with the correlated type III burst, extrapolated to the same frequency. This may be interpreted as the spike radiation being emitted at the same characteristic frequency as the type III emission. The generally higher polarization of spikes helps to distinguish them from type III bursts. Contrary to spikes at higher (decimetric) frequencies, 60% of metric spike events have the same sign of circular polarization as the associated type III bursts, 33% are opposite, while the polarization was not measurable for the rest of the type III bursts. Some of the metric spike events are associated with weak flare activity in Halpha_, but none has been found to be closely associated with a hard X-ray burst or a microwave event. Metric spikes are consistent with energy release at high altitudes producing low energy electron beams. If the spikes are caused by the same electron population as the type III bursts, its acceleration site must be below or in close proximity to the spike source.

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