Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..782f&link_type=abstract
Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 782-790.
Astronomy and Astrophysics
Astrophysics
8
Microwave Emission, Radar Measurement, Solar Radio Bursts, Radar Echoes, Solar Radio Emission
Scientific paper
The first solar radar experiment in microwaves, carried out with the 300-m dish in Arecibo using a 250 kW transmitter, is described. Receiving at a displaced frequency from the transmitted radar frequency makes it possible to probe the Langmuir (plasma) wave energy density of the corona in the 170-270 MHz range. No echo is found in various regions on the sun. It is pointed out that this contradicts some models of type I radio bursts and a proposed scattering mechanism of metric solar radar echos. Neither is any echo produced in an alternative experiment, in which reception is at the transmitted frequency. It is noted that the reflectivity of the sun in microwaves is more than four orders of magnitude below the reflectivity in meter waves.
Benz Arnold O.
Fitze H. R.
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