Small scale irregularities in Comet Halley's plasma mantle - an attempt at self-consistent analysis of plasma and magnetic field data

Details Small scale irregularities in Comet Halley's plasma mantle - an attempt at self-consistent analysis of plasma and magnetic field data Small scale irregularities in Comet Halley's plasma mantle - an attempt at self-consistent analysis of plasma and magnetic field data

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16....5v&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Jan. 1989, p. 5-8.

Physics

9

Halley'S Comet, Interplanetary Magnetic Fields, Plasma Diagnostics, Self Consistent Fields, Comet Heads, Plasma Density, Plasma Temperature, Time Series Analysis, Vega Project, Comets, Halley, Plasma, Mantle, Magnetic Fields, Vega 1 Mission, Comae, Density, Spacecraft Observations, Temperature, Pressure, Comet Nuclei, Distance, Ions, Techniques, Bd-3 Instrument, Mischa Instrument

Scientific paper

VEGA-1 measurements of the plasma density and magnetic field in the coma of Comet Halley show characteristic signatures over a significant portion of the outbound pass. It is found that the assumption that there is a balance between the thermal and magnetic pressures in these features can be used to obtain estimates of the plasma temperature as a function of distance from the nucleus. These estimates indicate that the ions cool from about 1.5 x 10 to the 6th K at 10 to the 5th km to 2 x 10 to the 5th K at 5 x 10 to the 4th km. The technique used here represents a novel approach whereby temperature measurements can be made in situations where only plasma density and magnetic field data are available.

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