Cometary ion flow variations at Comet P/Halley as observed by the Giotto IMS experiment

Details Cometary ion flow variations at Comet P/Halley as observed by the Giotto IMS experiment Cometary ion flow variations at Comet P/Halley as observed by the Giotto IMS experiment

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..229k&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, March 1990, p. 229-238. Research supported by DFG, DOE, BMFT, and SNSF.

Physics

11

Cometary Atmospheres, Ion Distribution, Ion Temperature, Solar Wind, Giotto Mission, Halley'S Comet, International Magnetospheric Study, Plasma Temperature, Comets, Ions, Flow, Halley, Spacecraft Observations, Giotto Mission, Ims Instrument, Plasma, Distance, Temperature, Velocity, Comparisons, Theoretical Studies, Spectrometry, His Instrument, Diagrams, Charge, Calculations, Distribution, Acceleration, Spectra

Scientific paper

The moments of the cometary-ion distributions are determined through a three-dimensional analysis of the Giotto IMS high-intensity spectrometer (HIS) data. The spectrometer is described, with emphasis on its angle analyzer and mass analyzer. The method of data analysis is outlined, with ion-flow vectors and temperatures being addressed. The results of the water group ion-flow profile are presented, and it is noted that, after crossing the cometopause region, the ions become gradually colder. At cometocentric distances larger than 130,000 km, the cometary-ion temperature is found to be in the area of 100 eV or higher, and derivations of the flow parameters are uncertain. The ion temperature and the flow speed become lower by about 50 eV after crossing the magnetic pile-up boundary. It is concluded that the observed velocity and temperature profiles can be explained on the basis of charge exchange processes.

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