Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248.1132w&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Sept. 15, 1981, p. 1132-1143. NSF-supported research.
Astronomy and Astrophysics
Astronomy
12
Plasma Waves, Radar Astronomy, Solar Corona, Solar Radar Echoes, Solar Radio Emission, Solar Wind, Bandwidth, Plasma Interactions, Radar Scattering, Solar Activity
Scientific paper
In the surprisingly large-bandwidth and high-intensity solar radar echoes observed by James (1968, 1970) at 38 MHz, the radar beam is scattered by density fluctuations high in the corona, typically at 2.2 solar radii. At such heights, the plasma wave mode most suitable for interaction with the radar is the lower hybrid mode, whose waves are driven at sites of steep density gradients and associated electrical currents in the corona. The hypothetical coherence of the lower-hybrid waves makes the required coronal activity and energy supply reasonable, so that the radar may be considered as a probe for coherent plasma waves in the corona. Alternative explanations for the radar echoes are shown to be improbable, and it is pointed out that unusually intense radar echoes also require a suitable geometrical alignment of the density gradients with the large-scale coronal structure.
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