Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140...39s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. 39-48. Research supported by the Centre National d'E
Astronomy and Astrophysics
Astrophysics
72
Interplanetary Medium, Plasma Waves, Type 3 Bursts, Wave Propagation, Brightness Temperature, Distance, International Sun Earth Explorer 3, Ion Density (Concentration), Plasma Radiation
Scientific paper
Interplanetary type III radio burst observations are analyzed in order to ascertain the role played by propagation effects between the true source and the observer. Large source altitudes are noted, together with an increasing angular size of sources with increasing angular distance from the sun's center. These and other observations furnish strong evidence for the theory that propagation effects, group delays, ducting and/or scattering significantly affect the observed heights, sizes, and brightness temperatures of interplanetary type III bursts. This would be true irrespective of whether the bursts are due to plasma radiation at the fundamental or at the harmonic, and the effects would extend to the arrival times of the radiation to a greater or lesser extent, depending on the path from the source to the observer.
Aubier M. G.
Dulk George A.
Hoang Sang
Lecacheux Alain
Steinberg Jean-Louis
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