Computer Science
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ssrv...68..193a&link_type=abstract
Space Science Reviews, Volume 68, Issue 1-4, pp. 193-198
Computer Science
1
Solar Flares, Particle Acceleration, Radio Emission
Scientific paper
The issue whether acceleration and injection of electron beams is coherently modulated by a single quasi-periodic source, or whether the injection is driven by a stochastic process in time or (eventually fragmented) in space, is investigated by menas of a periodicity analysis of metric type III bursts. We analyze 260 continuous type III groups observed byIkarus (ETH Zurich) in the frequency range of 100 500 MHz during 359 solar flares with simultaneous ≥25 keV hard X-ray emission, in the years 1980 1983. Pulse periods have been measured between 0.5 and 10 s, and can be described by an exponential distribution, i.e.N(P) ∝e -P/1.0s. We measure the mean periodP and its standard deviation σp in each type III group, and quantify the degree of periodicity by the dimensionless parameter σp/P. The representative sample of 260 type III burst groups shows a mean periodicity of σp/P=0.37±0.12, while Monte-Carlo simulations of an equivalent set of truly random time series show a distinctly different value of σp/P=0.93±0.26. This result suggests that the injection of electron beams is periodically modulated by a particle acceleration source which is either compact or has a global organization on a time scale of seconds.
Aschwanden Markus J.
Benz Arnold O.
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