Solar wind interactions with Comet 19P/Borrelly

Details Solar wind interactions with Comet 19P/Borrelly Solar wind interactions with Comet 19P/Borrelly

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004icar..167...80y&link_type=abstract

Icarus, Volume 167, Issue 1, p. 80-88.

Computer Science

18

Dynamics, Composition, Solar Wind

Scientific paper

The Plasma Experiment for Planetary Exploration (PEPE) made detailed observations of the plasma environment of Comet 19P/Borrelly during the Deep Space 1 (DS1) flyby on September 22, 2001. Several distinct regions and boundaries have been identified on both inbound and outbound trajectories, including an upstream region of decelerated solar wind plasma and cometary ion pickup, the cometary bow shock, a sheath of heated and mixed solar wind and cometary ions, and a collisional inner coma dominated by cometary ions. All of these features were significantly offset to the north of the nucleus-Sun line, suggesting that the coma itself produces this offset, possibly because of well-collimated large dayside jets directed 8°-10° northward from the nucleus as observed by the DS1 MICAS camera. The maximum observed ion density was 1640 ion/cm3 at a distance of 2650 km from the nucleus while the flow speed dropped from 360 km/s in the solar wind to 8 km/s at closest approach. Preliminary analysis of PEPE mass spectra suggest that the ratio of CO+/H2O+ is lower than that observed with Giotto at 1P/Halley.

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