Ion energetics in the inner coma of Comet Halley

Details Ion energetics in the inner coma of Comet Halley Ion energetics in the inner coma of Comet Halley

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..983c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, Oct. 1987, p. 983-986.

Astronomy and Astrophysics

Astronomy

11

Coma, Giotto Mission, Halley'S Comet, Ion Temperature, Astronomical Spectroscopy, Mathematical Models, Comets, Halley, Ions, Comae, Plasma, Comet Nuclei, Magnetic Fields, Friction, Heating, Gases, Neutral Particles, Flow, Temperature, Spacecraft Observations, Giotto Mission, Ims Instrument, Spectrometry, Chemistry, Calculations, Velocity, Theoretical Studies

Scientific paper

The cometary plasma in the magnetic barrier just outside the diamagnetic cavity which surrounds the nucleus of comet Halley is virtually stagnant. The outflowing neutral gas exerts an outward ion-neutral drag force on this plasma, which balances the inward magnetic pressure gradient force in the vicinity of the contact surface. The cometary ions are frictionally heated due to the relative motion of the ion and neutral gases. The ion flow velocity must have a few km/s non-radial component in order to explain the ion temperatures measured by the ion mass spectrometer on Giotto.

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