Hot Ions Observed by the Giotto Ion Mass Spectrometer at the Comet p/ Halley Contact Surface

Details Hot Ions Observed by the Giotto Ion Mass Spectrometer at the Comet p/ Halley Contact Surface Hot Ions Observed by the Giotto Ion Mass Spectrometer at the Comet p/ Halley Contact Surface

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..220g&link_type=abstract

Astronomy and Astrophysics, Vol. 187, NO. 1&2/NOV(I), P. 220, 1987

Astronomy and Astrophysics

Astrophysics

15

Scientific paper

Just inside the contact surface (˜ 4700 km) the High Energy Range Spectrometer (HERS) sensor of the Giotto Ion Mass Spectrometer (IMS) detected a sudden, intense burst of ions that lasted until the HERS sensor ceased transmitting data at a distance of ˜ 3000 km from comet P/Hallley. During this brief interval ions with M/Q = 1,2, 12, 14, 16-19,24, and 28 were observed. The heavier ions appear in two populations (in the S/C frame): 1) a very low energy, almost omnidirectional distribution, and 2) a more energetic (˜ ram speed) population coming from the ram direction. In this paper we investigate the possible origin(s) of these two populations. In particular, we discuss whether the low energy ions belong to the natural Halley enviroment or are generated at the spacecraft by dust and gas bombardment.

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