Determination of Comet Halley gas emission characteristics from mass loading of the solar wind

Details Determination of Comet Halley gas emission characteristics from mass loading of the solar wind Determination of Comet Halley gas emission characteristics from mass loading of the solar wind

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95...21h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Jan. 1, 1990, p. 21-30. Research supported by SERC, DOE, CNR, and Swe

Physics

41

Halley'S Comet, Solar Activity Effects, Solar Wind Velocity, Bow Waves, Giotto Mission, Shock Waves, Solar Protons, Comets, Halley, Gases, Emissions, Mass Loading, Solar Wind, Velocity, Spacecraft Observations, Giotto Mission, Models, Neutral Particles, Ions, Distribution, Production Rate, Ionization, Flux, Bow Shock, Comparisons, Calculations, Diagrams, Jpa Instrument

Scientific paper

The velocity profile of the solar wind during Giotto's approach to Comet Halley is fitted with the mass loading produced by a simple model of the neutral particle distribution. The model is used to calculate the implanted ion flux at Giotto for any given time and position along the spacecraft trajectory. Comparing the added flux with Giotto's solar wind proton data from the inbound leg outside the bow shock, the ratio of the total mass-loaded ion flux to the solar wind flux at the spacecraft is computed. Hence, using equations given by Galeev et al. (1985) values of the solar wind velocity, u-infinity, far upstream from the comet are inferred. Imposing the condition that u-infinity should be as nearly as possible constant in time, values of gas production rate and the ratio between radial expansion velocity and ionization rate required to fit the model to data are derived. The values obtained are consistent with those derived by more direct methods.

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