Physics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988rpsct...3...21k&link_type=abstract
In its JPRS Report: Science and Technology. USSR: Space p 21 (SEE N88-30498 24-88) Transl. into ENGLISH from Kosmicheskiye Issle
Physics
Magnetic Fields, Solar Wind, Stability, Venus Atmosphere, Ionopause, Kelvin-Helmholtz Instability, Pioneer Venus Spacecraft, Plasma Flux Measurement
Scientific paper
The Pioneer-Venus spacecraft discovered in 1979 that although Venus does not have its own magnetic field, under conditions of low dynamic pressure of the solar wind, regions with a relatively strong magnetic field with a strength of 50 to 100 gamma could be detected. Characterized by field bursts of several seconds, and therefore having an extent of tens of kilometers, these regions were interpreted as plaits of magnetic lines of force. The nature of this phenomenon has remained unclear. One of the suggested mechanisms is ionopause destruction due to instability caused by a marked change in the velocity of plasma flow near the ionopause with transition from the moving plasma of the solar wind transition region to the at-rest plasma of the ionosphere and the transport of the magnetic plaits forming in the nonlinear stage of instability into the depths of the ionosphere due to plasma convection. Research has shown that Kelvin-Helmholtz instability develops in the region of small zenith angles. During periods of low solar wind dynamic pressure the Venus ionopause is stable relative to perturbations with a characteristic dimension 50 km (size of the magnetic plaits) in the region of zenith angles of 10 deg or less.
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