Physics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8219125k&link_type=abstract
Unknown
Physics
Delay, Microwaves, Millimeter Waves, Radio Emission, Solar Physics, Solar Radio Bursts, Time Lag, Antennas, Atmospheric Effects, Dynamic Characteristics, Maxima, Radio Frequencies, Time Measurement, X Rays
Scientific paper
Various solar bursts were analysed with high sensitivity (0.03 s.f.u., r.m.s.) and high time resolution (1 ms) at two frequencies in the millimeter wave range (22 GHz and 44 GHz) and with moderate time resolution (100 ms) by a patrol telescope at a frequency in the microwave range (7 GHz). It was found that in most cases burst maximum emission is not coincident in time at those frequencies. Preceding maximum emission can be either at the higher or at the lower frequency. Time delays ranged from about 3 sec to near coincidence, defined within 10 ms. Some complex bursts presented all kinds of delays among different time structures, and sometime nearly uncorrelated time structures. Directional particle accelerations in complex magnetic configurations could be considered to explain the variety of the dynamic effects. Fastest burst rise times observed of 10ms at 44GHz and 40 ms at 22 GHz, might be associated to limiting formation times of emission sources combined to various absorption mechanisms at the source and surrounding plasma.
Costa Joaquim E. Rezende
Kaufmann Patrik
Strauss Federico M.
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