Magnetic field and plasma wave observations in a plasma cloud at Venus

Details Magnetic field and plasma wave observations in a plasma cloud at Venus Magnetic field and plasma wave observations in a plasma cloud at Venus

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9...45r&link_type=abstract

Geophysical Research Letters, vol. 9, Jan. 1982, p. 45-48.

Physics

35

Planetary Magnetic Fields, Plasma Waves, Venus Clouds, Cold Plasmas, Interplanetary Magnetic Fields, Magnetic Field Configurations, Pioneer Venus Spacecraft, Venus, Plasmas, Clouds, Waves, Magnetic Fields, Observations, Structure, Pioneer Venus, Data, Longitude, Latitude, Acceleration, Ionosphere, Temperatures, Geometry, Flows, Velocity, Solar Wind, Interactions, Amplitude

Scientific paper

Pioneer Venus magnetic field and plasma wave data are examined in a particularly clear example of a plasma cloud above the Venus ionosphere. The magnetic configuration is suggestive of acceleration of the plasma cloud by magnetic tension. If the plasma is at rest at the subsolar point, it could be accelerated to approximately 90 km/sec by the observed stress at the location of the measurement. This far exceeds the escape velocity and suggests that plasma clouds do form a significant loss mechanism for the Venus ionosphere but does not necessarily indicate that the plasma cloud is detached from the ionosphere proper. The plasma cloud is accompanied by strong plasma wave activity and is significantly hotter than the ionospheric plasma encountered later on the same pass. A loss rate of the order of 2 x 10 to the 25th ions/sec is estimated during this event. The geometry suggested by these observations is one of a ridge of dense cold plasma starting in the subsolar regions and flowing over the poles of the planet. Thus, these plasma clouds may be the planetary analog of cometary tail rays.

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