Physics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..151s&link_type=abstract
Annales Geophysicae (ISSN 0980-8752), vol. 7, April 1989, p. 151-160.
Physics
12
Auroras, Kilometric Waves, Magnetosheath, Solar Terrestrial Interactions, Wave Propagation, Angular Distribution, International Sun Earth Explorer 3, Magnetopause, Refractivity
Scientific paper
From ISEE-3 in the night side solar wind and magnetosheath, at low frequencies f (less than about 150 kHz), the Auroral Kilometric Radiation (AKR) source is often seen very far away from earth. These effects increase with the solar wind plasma frequency to f ratio and change abruptly during a bow shock crossing. A semiquantitative interpretation of these observations is given in terms of refraction and scattering between the auroral source and the observer, thus eliminating the need for magnetosheath sources of intensity comparable to that of AKR. It is also demonstrated that part of the low frequency AKR cannot escape through the bow shock and must be guided tailward by the magnetopause and the magnetosheath density gradient.
Hoang Sang
Lacombe Catherine
Steinberg Jean-Louis
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