Physics
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mst...........m&link_type=abstract
Masters Thesis, INPE-6382-TDI/601
Physics
5
Solar Flares, Impulses, Energy Dissipation, Dynamic Characteristics, Type 3 Bursts, Spectrometers, Broadband, Deuterium Fluorides, Digital Data, Drift Rate, Electron Density (Concentration), Frequency Ranges, Photosphere
Scientific paper
Decimetric type III bursts are generated near the region of acceleration of the particles and liberation of the energy to the flare, particularly for impulsive phase, hence their investigations will lead to a better understanding of the process of acceleration. We have analyzed dynamic spectra of decimetric bursts (100-3000 MHz) observed with the spectrometer PHOENIX (Switzerland). These bursts are classified as type III, spike, and patch, and a catalogue of these bursts is presented. From the detailed analysis of type III bursts, the major results are: most of type III bursts have less than 250 MHz frequency range; the average half power duration is tl/2 = 1.7 x 104 f-0.60; the number of bursts decreases with increasing start frequency and flux; flux decreases with increasing frequency; of all bursts, 67% are reverse slope, 36 % normal and 5 % bidirectional; the average drift rate of propagating beams is absolute value of (df/dt) = 0.09 f1.35; the mean type 3 exciter velocity is found to be upsilon3 = 0.16 c (7 keV; harmonic emission is predominantly in the decimetric range; mean electron density (nb) and total number of electrons (N) per beam are nb approx. equals 6 x 104/cc and N approx equals 6 x 1031 electrons, respectively; we infer electron densities of ne approx. equals 109 - 1011/cc at the acceleration site, at heights of 104 - 105 km above the photosphere; we infer an upper limit of (Delta)h less than or equals to 4000 km for the extension of the acceleration site and an acceleration time of (Delta)t less than or equals to 5 ms. Also, software is presented for the detection of type III and spike bursts which will be used for studies of solar flares observed by the Wide Band Decimeter Spectroscope at INPE, and the FITS format for the digital data.
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