Magnetic field studies of the solar wind interaction with Venus from the Galileo flyby

Details Magnetic field studies of the solar wind interaction with Venus from the Galileo flyby Magnetic field studies of the solar wind interaction with Venus from the Galileo flyby

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...253.1518k&link_type=abstract

Science (ISSN 0036-8075), vol. 253, Sept. 27, 1991, p. 1518-1522.

Physics

15

Flyby Missions, Galileo Spacecraft, Interplanetary Magnetic Fields, Shock Waves, Solar Planetary Interactions, Solar Wind, Venus (Planet), Bow Waves, Collisionless Plasmas, Extremely Low Radio Frequencies, Magnetohydrodynamic Waves, Satellite Observation, Spacecraft Trajectories

Scientific paper

During the February 10, 1990 flyby of Venus, the Galileo spacecraft skimmed the downnstream flank of the planetary bow shock. This provided an opportunity to examine both the global and the local structure of the shock in an interval during which conditions in the solar wind plasma were quite steady. The data show that the cross section of the shock in planes transverse to the flow is smaller in directions aligned with the projection of the interplanetary magnetic field than in directions not so aligned. Ultralow-frequency waves were present in the unshocked solar wind, and their amplitude peaked when the spacecraft was downstream of the foreshock. At large distances down the tail, the Mach number of the flow normal to the shock is low, thus providing the opportunity to study repeated crossings of the collisionless shock in an interesting parameter regime. Some of the shock crossings reveal structure that comes close to the theoretically predicted form of intermediate shocks, whose existence in collisionless plasmas has not been confirmed.

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