Comparison of observed plasma and magnetic field structures in the wakes of Mars and Venus

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Mars (Planet), Planetary Magnetic Fields, Space Plasmas, Venus (Planet), Phobos, Pioneer Venus Spacecraft, Planetary Magnetotails, Wakes

Scientific paper

Notable similarities in the structure of the low-altitude magnetotails at Mars and Venus are pointed out based on Phobos 2 and Pioneer Venus data. When conditions in the interplanetary medium are steady and other orbit sampling geometry is appropriate, two magnetic tail lobes with an intervening 'plasma sheet' or 'central tail ray' in the approximate location of the dividing current sheet are present. In the Phobos 2 data, the tail ray is found to be composed primarily of antisunward streaming oxygen plasma with a bulk velocity consistent with an energy close to that of the upstream solar wind plasma. The Pioneer probe experiment detected two more more additional cold plasma structures flanking the central feature; Phobos 2 data, on the other hand, show a proton plasma 'boundary layer' flanking the central tail ray or plasma sheet, with sporadic fluxes or rays of O(+) ions.

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