Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...48..321d&link_type=abstract
Solar Physics, vol. 48, June 1976, p. 321-337.
Astronomy and Astrophysics
Astronomy
10
Noise Storms, Radio Astronomy, Solar Radio Bursts, Solar Storms, High Frequencies, Noise Spectra, Radio Spectra
Scientific paper
The paper investigates chains of solar type I noise-storm bursts appearing on spectra obtained with a 60-channel radiospectrograph over the frequency range between 160 and 320 MHz with an effective time resolution of 20 msec. The bandwidth and starting-frequency distributions of the chains are determined, and it is found that the overall distribution of starting frequencies is rather flat on the low-frequency side but slopes down to 10% between 240 and 280 MHz, indicating the width of the cutoff band for noise storms. Analysis of the chain duration distribution indicates an exponential fit, a fairly constant characteristic time, and a smooth decrease in characteristic time with increasing frequency. Evidence is presented in support of the idea that chains and single type I bursts are actually the same phenomenon, and the probability that a type I storm burst will be followed by another is estimated to be 90% for frequencies below 250 MHz and 70% to 80% for 300 MHz. The burst density in chains is examined along with frequency drift rates and a possible correlation between duration and drift rate.
de Groot T.
Loonen J.
Slottje C.
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