STEREO-1 measurements of the beam pattern of 169 MHz type I bursts on November 18, 1971

Details STEREO-1 measurements of the beam pattern of 169 MHz type I bursts on November 18, 1971 STEREO-1 measurements of the beam pattern of 169 MHz type I bursts on November 18, 1971

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....37..109s&link_type=abstract

Astronomy and Astrophysics, vol. 37, no. 1, Dec. 1974, p. 109-115. Research sponsored by the Centre National d'Etudes Spatiales

Astronomy and Astrophysics

Astronomy

20

Beams (Radiation), Mars 3 Spacecraft, Microwave Emission, Solar Observatories, Solar Radio Bursts, Astronomical Models, Directivity, Ground Stations, Radiant Flux Density, Spaceborne Astronomy, U.S.S.R. Space Program

Scientific paper

The beam pattern of Type I bursts is investigated using simultaneous 169-MHz observations from two different directions: from the Soviet probe Mars-3 and Nancay (France). The directivity factor R (ratio of the intensity at the probe to that at the earth) was measured for 380 individual bursts observed on two storm centers on November 18, 1971. The observations can be completely accounted for using a simple model: the polar diagram of Type I radiation is approximately constant in shape: only its orientation changes from burst to burst; and the distribution of the maximum intensity of Type I's is essentially independent of the beam orientation. The probability distribution of the maximum intensity, i.e. of the intensity of the sources themselves, was obtained. The most probable orientation of the center source beam is about 20 degrees east of the sun-earth line. The standard deviation is about 4 degrees.

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