Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a..35n&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 35-41 (SEE N87-2
Physics
5
Cavities, Halley'S Comet, Ionopause, Magnetic Fields, Plasma-Electromagnetic Interaction, Cometary Atmospheres, Giotto Mission, Magnetic Measurement, Solar Wind
Scientific paper
Investigations of the inner plasma boundaries in the magnetoplasma surrounding comet Halley during the encounter of the GIOTTO spacecraft have revealed the following information: (a) The magnetic pile-up region boundary had a stand-off distance in the direction opposite to the aberrated solar wind between 143000 km and 215000 km depending on the assumed flaring. The axis of symmetry had an offset of 80000 km from the nucleus. (b) The ionopause, i.e. the outer boundary of the magnetic cavity region, had either a smooth surface of radius 4600 km displaced from the nucleus by 1400 km or, alternatively, it had no average displacement but strong ripples aligned with the aberrated solar wind direction, a wavelength of at least 200 km and a radius of approximately 4300 km.
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