First results from the Giotto magnetometer experiment during the P/Grigg-Skjellerup encounter

Details First results from the Giotto magnetometer experiment during the P/Grigg-Skjellerup encounter First results from the Giotto magnetometer experiment during the P/Grigg-Skjellerup encounter

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268l...5n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 2, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

48

Giotto Mission, Grigg-Skjellerup Comet, Interplanetary Magnetic Fields, Bow Waves, Magnetometers, Photoionization, Shock Waves, Solar Wind, Comet, Grigg-Skjellerup, Magnetic Field, Interaction, Giotto Mission, Spacecraft Observations, Mag Instrument, Waves, Bowshock, Distance, Neutral Particles, Gases, Production Rate, Gem Mission

Scientific paper

The Giotto magnetic field experiment has provided the first magnetic field data on the interaction between the solar wind and a low gas production comet, P/Grigg-Skjellerup. Waves produced by ion pick-up instabilities have been observed throughout the interaction region with particularly simple waveforms at large distances and a rich phenomenology. A bow shock has been observed outbound only, whereas inbound a change in the character of the wave fields occurred without a jump in the magnetic field vector. The inbound and outbound crossings of the bow wave and shock at 19,900 km and 25,400 km from the nucleus, respectively, imply a neutral gas production rate of (6.7 +/- 1.6) x 10 exp 27/sec. A magnetic field cavity of the comet was not crossed. The pile-up region of 2500 km width along the trajectory showed a magnetic field peak of 88.7 nT.

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