Intermediate transition in the Venus ionosheath

Details Intermediate transition in the Venus ionosheath Intermediate transition in the Venus ionosheath

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10014523p&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A8, p. 14523-14536

Physics

Plasma Physics

15

Planetology: Comets And Small Bodies: Magnetic Fields And Magnetism, Planetology: Comets And Small Bodies: Plasma And Mhd Instabilities, Space Plasma Physics: Discontinuities

Scientific paper

We present the results of an analysis of Pioneer Venus Orbiter (PVO) plasma and electric and magnetic field data with evidence of a plasma transition along the flanks of the Venus ionosheath for 8 PVO passes near the terminator. This transition occurs between the bow shock and the ionopause and represents a stationary change in the properties of the shocked solar wind that streams around the Venus ionosphere. We find that the intermediate transition is characterized by three concurrent features: (1) A noticeable electric field burst measured with the 30 kHz channel of the electric field detector of the PVO; (2) a severe drop of the magnetic field intensity accompanied by a strong rotation of the magnetic field orientation to a direction closer to the Sun-Venus axis in the inner ionosheath; and (3) substantially enhanced plasma fluxes detected at the time when these changes in the electric and magnetic fields are measured. The peak particle flux and the peak magnetic field intensity measured at this transition in the data of the 17 PVO orbits are also presented. It is found that large values of the enhanced particle fluxes occur mostly when the peak magnetic field intensity is large.

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