Statistical analysis of high-frequency decimetric type III bursts

Details Statistical analysis of high-frequency decimetric type III bursts Statistical analysis of high-frequency decimetric type III bursts

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..187...77m&link_type=abstract

Solar Physics, v. 187, Issue 1, p. 77-88 (1999).

Physics

27

Scientific paper

Here we report the statistical analysis of 160 isolated decimetric type III bursts, a majority of them (74%) having central frequency above 1000 MHz, observed in 8 flares by the spectrometer Phoenix. The most important finding of the detailed analysis is: 67% of all the bursts are reverse slope, 38% normal and 5% bi-directional. Also, we obtained the following results: (a) the best fits for the average half power duration and for the average drift rate as a function of frequency are given by t_1/2=1.7x10^4f^-0.60 and |df/dt|=(0.09+/-0.03)f^(1.35 +/- 0.10), respectively; (b) the frequency range of most of the type III bursts is less than 250 MHz (c) the number of bursts decreases with increasing starting frequency and flux; (d) peak flux decreases with increasing frequency. The relations obtained fit well for higher frequency observations. Assuming an improved density model and type III emission at 2^nd harmonic, the beam parameters of type III bursts are determined.

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