Physics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...95..167w&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 95, Jan. 1985, p. 167-179. Sponsorship: Swiss National Science Foundation.
Physics
40
Decimeter Waves, Solar Radio Bursts, Time Constant, Drift Rate, Radio Spectroscopy, Synchrotron Radiation, Trapped Particles
Scientific paper
Between 1980, January 1 and 1981, December 31 a total of 664 'decimetric pulsation' events (DCIM) were observed with the Zürich spectrometers in the frequency range 100 to 1000 MHz. The class of DCIM bursts can be divided into two groups depending on their duration and thus reflecting different physical mechanisms. Each of the two groups can be further divided into small and large bandwidth subgroups. Short decimetric events (⪉1 s) are most abundant in this frequency range. They may be caused by fast transients in the solar atmosphere. The half-power bandwidth of the shortest DCIM bursts, the millisecond spikes, were found to be 6 to 12 MHz. The long lasting DCIM bursts (5 s to 300 s) exhibit a gradual and smooth time profile. Such long lasting events indicate the presence of trapped particles in magnetic fields.
Aschwanden Markus J.
Benz Arnold O.
Wiehl H. J.
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