Plasma flow in the cometosheath of P/Halley during the encounter of Suisei

Details Plasma flow in the cometosheath of P/Halley during the encounter of Suisei Plasma flow in the cometosheath of P/Halley during the encounter of Suisei

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187...94t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 94-96.

Astronomy and Astrophysics

Astrophysics

1

Flyby Missions, Halley'S Comet, Japanese Spacecraft, Magnetohydrodynamic Flow, Plasma Sheaths, Solar Wind, Charge Transfer, Plasma Cooling, Plasma Interactions

Scientific paper

The authors estimate proton and alpha particle bulk parameters within the cometosheath. They observed that the density of proton was almost constant (≡200 cm-3) except near the bow shock and that of alpha particle was almost constant (≡7 cm-3) in the cometosheath. Temperature of protons seems to decrease from bow shock to about 2×105km, and increase thereafter sligthly, but that of alpha particle seems to be almost constant. This decrease is likely caused by the cooling effect accompanying with the charge exchange process as well as with the mass addition of cold pickup ions. On the contrary, the observed temperature of alpha particles stayed almost constant throughout the cometosheath. This is because there is no effective cooling process for alpha particles within the cometosheath.

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