Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p12c0512p&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P12C-0512
Physics
6027 Ionospheres: Evolution, 6028 Ionospheres: Structure And Dynamics, 6030 Magnetic Fields And Magnetism
Scientific paper
Plasma channels that extend downstream from the magnetic polar regions of the Venus ionosphere have been inferred from the Mariner 5 and PVO measurements of the shocked solar wind in those regions. The plasma channels result from the erosion that the shocked solar wind produces on the polar upper ionosphere through transport processes and can be used to account for the ionospheric holes observed in electron density profiles of the nightside ionosphere. Additional information that supports the existence of the plasma channels is obtained from the PVO magnetic field data which show that within the ionospheric holes the magnetic field has the same polarity than that in the ionosheath and also becomes more aligned to the solar wind direction. At the same time the magnetic field intensity becomes stronger within the holes than in the ionosheath. The electron density profiles in the nightside ionosphere show cases in which the ionopause measured near the midnight plane is seen at altitudes much lower (£ 200 km) than the (3 800 km) values that are usually seen throughout most of the nightside ionosphere. It is argued that in such cases the PVO orbit is traced across the ionosphere through the plasma channels.
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