Statistics – Computation
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...158..102a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 158, no. 1-2, April 1986, p. 102-112.
Statistics
Computation
52
Drift Rate, Solar Corona, Solar Oscillations, Solar Radio Bursts, Type 3 Bursts, Computational Astrophysics, Decimeter Waves, Point Sources, Solar Atmosphere
Scientific paper
A set of 1270 digitally recorded type III bursts and pulsations in the frequency range of 100 - 1000 MHz was analyzed by a structure recognizing program. Numerical fitting methods determined the drift rate with much higher accuracy than previous analysis of analog data. The analysis of the drift of solar radio bursts in frequency vs. time provides information not only about the dynamical parameters of the source but also reveals atmospherical properties. Type III events and pulsations are clearly distinguished in their drift distribution. Pulsations statistically exhibit 3 times higher drift rates than type III events, thus requiring considerably shorter local scale heights. The source direction of the type III bursts is preferentially upwards oriented, the pulsations show a downwards oriented anisotropy. Evidence is given that the pulsations have a different origin than the common type III burst, concerning the coronal environment as well as the emission mechanism. Outlines to construct models of decimetric pulsations are discussed.
Aschwanden Markus J.
Benz Arnold O.
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