Doppler measurements of the H2O(+) ion velocity in the plasma tail of Comet Levy 1990c

Details Doppler measurements of the H2O(+) ion velocity in the plasma tail of Comet Levy 1990c Doppler measurements of the H2O(+) ion velocity in the plasma tail of Comet Levy 1990c

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..102..117r&link_type=abstract

Icarus (ISSN 0019-1035), vol. 102, no. 1, p. 117-133.

Computer Science

15

Comet Tails, Ion Motion, Ion Production Rates, Space Plasmas, Velocity Measurement, Water, Doppler Effect, Emission Spectra, Ionized Gases, Comets, Doppler Shift, Water, Ions, Velocity, Comet Tail, Plasma, Levy, Earth-Based Observations, Ccd Methods, Emissions, Interferograms, Optical Properties, Production Rate, Concentration, Comparisons, Flux, Equipment, Analysis, Ionization, Interferometry, Structure, Hypotheses, Motion, Distribution, Momentum

Scientific paper

2D ion velocity fields have been obtained for the first time from measurements of the Doppler shift of ion emission lines in the plasma tail of the Comet Levy 1990c. Images of the comet obtained alternating with interferograms show the appearance of the plasma tail. Velocities from about 10 to 70 km/s are measured. The velocity fields show variations in speed and distribution of velocity values during the observing period. A clear correlation of velocity and ion distribution, as expected from momentum exchange with a stationary solar wind, could not be found in most cases. The flux of H2O(+) ion in the tail is calculated and shows variations from night to night. The mean production rate of 1.5 x 10 exp 27/s corresponds to only 18 percent of the expected value assuming photoionization to be the main ionization process.

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