Solar type III burst profiles at decametre-wave frequencies. I - Observations. II - Exciter

Details Solar type III burst profiles at decametre-wave frequencies. I - Observations. II - Exciter Solar type III burst profiles at decametre-wave frequencies. I - Observations. II - Exciter

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...45..459b&link_type=abstract

Solar Physics, vol. 45, Dec. 1975, p. 459-465, 467-476.

Astronomy and Astrophysics

Astronomy

6

Short Wave Radiation, Solar Corona, Solar Electrons, Solar Spectra, Type 3 Bursts, Radio Astronomy, Solar Magnetic Field

Scientific paper

The papers report and analyze observations of solar type III bursts which were made at fixed frequencies of 18, 22, 26, and 36 MHz. Average values of the half-intensity duration, the total duration of the exciter, the decay-time constant, and the peak-to-peak frequency drift rate are calculated for each frequency on the basis of 103 burst profiles. The decay-time constant is found to have approximately the same linear relationship with total exciter duration at each of the four frequencies. The form of the exciter function is then computed by treating the burst profiles as convolutions of an exciter function and an exponential decay function. The results show that over the frequency range from 18 to 36 MHz, (1) the exciter function possesses negative skewness, (2) the shapes of exciter and burst profiles are approximately constant, and (3) burst peak times vary linearly with source height in the corona. The nonlinear behavior of certain other parameters with respect to source height and frequency is attributed to the passage of the exciting electron streams through magnetic-field-dominated and flow-dominated coronal regions.

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