Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pazh...12..388e&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 12, May 1986, p. 388-392) Soviet Astronomy Letters (ISSN 0360-0327), vol. 12, May-June
Astronomy and Astrophysics
Astronomy
Plasma Frequencies, Solar Corona, Type 3 Bursts, Echoes, Solar Radio Emission, Solar Storms, Solar Wind Velocity
Scientific paper
In the frame of the mechanism of generation of the fundamental mode of type III solar radio bursts suggested by Eremin and Zajtsev (1985) the formation of an echo event in the corona at plasma frequency is shown to be possible. Examples of events are given which were observed during the type IIIb-III radio storm in July, 1974 and may be identified as radio echos. A regular "violet" (in comparison with the primary burst) frequency shift of the echo burst has been detected that results from the radiation reflection from moving inhomogeneities of the solar wind. An estimate of the mean velocity of the solar wind of VSW ≅ 107cm/s at the distance R_sun; from the photosphere is obtained.
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