Radiation mode and coronal propagation of solar type III radio bursts observed on 14 November 1971 during Stereo-1 experiment

Details Radiation mode and coronal propagation of solar type III radio bursts observed on 14 November 1971 during Stereo-1 experiment Radiation mode and coronal propagation of solar type III radio bursts observed on 14 November 1971 during Stereo-1 experiment

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97...36p&link_type=abstract

Astronomy and Astrophysics, vol. 97, no. 1, Apr. 1981, p. 36-42.

Astronomy and Astrophysics

Astronomy

7

Propagation Modes, Radiation Distribution, Solar Corona, Solar Wind, Spaceborne Astronomy, Type 3 Bursts, Harmonic Radiation, Magnetic Field Configurations, Plasma Frequencies, Plasma Waves, Space Probes, Stereoscopy, Time Lag

Scientific paper

On 14 November 1971, during STEREO-1 experiment, we have observed many solar type III bursts at 169 MHz simultaneously on the Earth and on the Soviet space probe Mars 3. Seen from the Sun, the probe was at θ=33° east of the Earth; the active center was at 68° E.
In two preceding papers, we have shown that the 6 characteristic pairs recorded on that day, with a first component shorter and more directive than the second, were probably fundamental (F) - harmonic (H) pairs, and that isolated bursts could be identified either as F or H bursts.
Here we compare the time difference t of bursts between the probe and the Earth to their position p seen at the Earth. We find a relation t = ap + b, very different between the 2 families: αF = 0.00; αH = 0.16 (s/'). The theoretical slope for a simple model is just in between. This confirms the identification of F and H modes, and provides evidence that they experience very different propagation effects:
F bursts have an apparent image much higher and larger than their actual sources; the position variations are due to variable propagation conditions which have only very small effects on the propagation time.
H bursts are seen without much deformation but experience some group delay.

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