Physics – Plasma Physics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1074l&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A6, pp. SMP 7-1, CiteID 1074, DOI 10.1029/2001JA900147
Physics
Plasma Physics
2
Magnetospheric Physics: Solar Wind Interactions With Unmagnetized Bodies, Ionosphere: Planetary Ionospheres (5435, 5729, 6026, 6027, 6028), Space Plasma Physics: Kinetic And Mhd Theory
Scientific paper
The planet Venus has a dense atmosphere, and hence an ionosphere, and does not possess an intrinsic magnetic field. The solar wind interacts directly with the atmosphere and ionosphere of Venus. The Pioneer Venus Orbiter (PVO) observed many small-scale magnetic rope-like structures within the ionosphere. We examine thermal pressure variations for ~2000 ropes for a wide range of altitudes and solar zenith angles. We demonstrate that flux ropes are statistically force-free at low altitudes, meaning that a decrease of thermal pressure variation across them is not needed to compensate for the magnetic pressure in these ropes. However, at higher altitudes, there is a statistical tendency for ropes to display a thermal pressure variation across them, indicating that these ropes are not fully force-free.
Cravens Thomas E.
Ledvina Stephen A.
Nunes Daniel C.
Tinker Jeremy L.
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