Physics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..517l&link_type=abstract
Geophysical Research Letters, vol. 8, May 1981, p. 517-520.
Physics
31
Near Wakes, Planetary Ionospheres, Planetary Magnetic Fields, Venus Atmosphere, Magnetic Field Configurations, Night, Pioneer Venus 1 Spacecraft, Steady State, Zenith, Venus, Observations, Magnetic Fields, Nightside, Ionosphere, Geometry, Wakes, Pioneer Venus Orbiter, Magnetometer, Solar Wind, Pressure, Magnitude, Altitude, Data, Distribution, Frequencies, Magnetotails
Scientific paper
Based on an analysis of a large sample of Pioneer Venus Orbiter magnetometer data, characteristics of the magnetic fields near nightside periapsis are discussed. The observations generally indicate a weak average field of less than 10 gammas between 200 km and the periapsis altitude of 150 km, except when (1) the local solar wind dynamic pressure is high or (2) the spacecraft is in a 70 deg wide solar zenith angle range, which includes the midnight meridian and is centered west of it at 1 hr local time. The presence of radial field of alternating sign at low altitudes and in the nightside ionosphere suggests that the antiparallel magnetotail fields can terminate very close to the planet.
Elphic Richard C.
Luhmann Janet G.
Mihalov John D.
Russell Christopher T.
Slavin James Arthur
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