Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.6103l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. E4, April 25, 1992, p. 6103-6121.
Physics
9
Pioneer Venus Spacecraft, Planetary Ionospheres, Planetary Magnetic Fields, Solar Wind, Venus Atmosphere, Atmospheric Models, Dynamic Pressure, Lines Of Force, Magnetic Field Configurations, Night
Scientific paper
When the solar wind dynamic pressure at Venus was extraordinarily high during the primary mission of the Pioneer Venus Orbiter (PVO), 'disappearing ionospheres' occurred on the nightside, with accompanying pervasive near-periapsis magnetic fields of tens of nanoteslas. These nightside counterparts of the generally horizontal large-scale magnetic fields in the dayside ionosphere are found to exhibit some dependence of field magnitude on the solar wind pressure but not on solar zenith angle. Their statistical behavior suggests a global configuration in which the low-altitude field wraps around the planet, while the field at higher altitudes is draped like the induced magnetotail field. The toroidal low-altitude field geometry implies the possible existence of magnetic x points in the low-altitude wake.
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