Exponential decay and exciter profile of fast pulses in type IV events

Details Exponential decay and exciter profile of fast pulses in type IV events Exponential decay and exciter profile of fast pulses in type IV events

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..104...51a&link_type=abstract

(CNR, Workshop on Radio Continua during Solar Flares, Duino, Italy, May 27-31, 1985) Solar Physics (ISSN 0038-0938), vol. 104, M

Physics

2

Decay Rates, Radiant Flux Density, Sawtooth Waveforms, Temporal Distribution, Type 4 Bursts, Decametric Waves, Exponential Functions, Fourier Transformation, Plasma Waves, Polarization Characteristics, Type 3 Bursts

Scientific paper

Some fast bursts occurring at 237 MHz during type IV events in association with sawtooth pulsations have been studied. These bursts, when occurring in sufficient isolation from the adjacent pulsating activity, appear to have an exponential decay phase similar to that of fast type II bursts. A computational procedure, based on Fourier transform techniques, has been applied; it allows the computation, for every observed point in the time profile, of the corresponding value for the logarithmic derivative and for the exciter function. The results so far obtained show that the time decay value is of the same order observed for normal type III's. As the bursts studied appear clearly not to be type III's, but rather isolated components of pulsation groups, this result may be an interesting indicator of the emission mechanism (plasma waves excitation and its abrupt stop) involved in type IV decimetric pulsations.

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