Observations of a shock and a recombination layer at the contact surface of Comet Halley

Details Observations of a shock and a recombination layer at the contact surface of Comet Halley Observations of a shock and a recombination layer at the contact surface of Comet Halley

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9417251g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 17251-17257. Research supported by BMFT and SNSF.

Physics

22

Cometary Atmospheres, Energetic Particles, Giotto Mission, Halley'S Comet, Mass Spectrometers, Shock Waves, Ion Temperature, Wave Propagation

Scientific paper

Results are presented on observations in the vicinity of the contact surface of the Comet Halley, obtained by the Giotto ion mass spectrometer, with emphasis placed on two specific events observed in this region on the inbound pass. One was a burst of energized ions (about 20 eV) of 2-sec duration observed two seconds before the contact surface was encountered, which coincided with a pulse in magnetic field strength interpreted by Neubauer (1988) as a fast-mode shock traveling away from the contact surface. The second was a sharp spike in ion densities observed at the contact surface by the mass analyzer, centered approximately at the inner edge of the contact surface. This ion-density spike is interpreted as a boundary layer into which the radial ionospheric flow enters and piles up; the density increase is limited by recombination.

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