Comet plasma densities deduced from refraction of occulted radio sources

Details Comet plasma densities deduced from refraction of occulted radio sources Comet plasma densities deduced from refraction of occulted radio sources

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...38..123w&link_type=abstract

Icarus, vol. 38, Apr. 1979, p. 123-135.

Astronomy and Astrophysics

Astronomy

9

Comet Tails, Kohoutek Comet, Plasma Density, Radio Occultation, Radio Wave Refraction, Atmospheric Refraction, Data Reduction, Density Distribution, Electron Density (Concentration), Error Analysis, Ionospheric Propagation, Radio Sources (Astronomy), Comets, Plasmas, Occultations, West, Comet, Comet Tails, Flux, Observations, Megahertz, Electrons, Plasma Sheet, Radio Occultations, Asymmetry, Ions, Density, Refraction, Reduction

Scientific paper

Observations of the occultation of radio sources by comet plasma tails are used to derive the electron density and density gradients in the tails. Occultations of source Culgoora-1 0300+16 by Comet Kohoutek and of Culgoora-1 2313-14 by Comet West were measured by radioheliograph at 80 MHz. After corrections for ionospheric refraction, a 2 arcmin anomaly was observed in the declination of 0300+16, attributed to refraction by the tail of Comet Kohoutek, while none was observed for Comet West. The maximum electron density in the tail of Comet Kohoutek is calculated to be 2 x 10 to the 4th/cu cm, while that of Comet West is 5 x 10 to the 4th/cu cm, with density gradients of about 0.05 per cu cm per km. The direction of refraction observed suggests that the tail of Kohoutek is either highly asymmetric about its axis or has the form of a hollow, cylindrical plasma sheath. The high electron densities observed in Kohoutek may indicate the presence of undetected ion species or a low ionization loss rate.

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