Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1327i&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 13, July 6, 1992, p. 1327-1330.
Physics
3
Comet Tails, Halley'S Comet, Particle Acceleration, Current Sheets, Giotto Mission, Interplanetary Magnetic Fields, Magnetic Field Configurations, Magnetohydrodynamic Flow
Scientific paper
The possible contribution from current sheet acceleration in the near-tail region of Comet Halley is discussed. If the transformation of the tear-drop shape of the magnetic field free boundary of the ionospheric contact surface to an elongated current sheet is accompanied by the formation of a magnetic neutral line, the introduction of a cross-tail electric field could be effective in generating keV ions near the neutral line and the current sheet. The beaming of these accelerated ions toward the inner coma will likely result in the production of a secondary hot ion component with degraded energies from collisional thermalization. Such an 'auroral' activity could play an important role in the energetics, ionization and dynamics of cometary ionospheres.
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