Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm32d02l&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM32D-02
Physics
2780 Solar Wind Interactions With Unmagnetized Bodies, 6025 Interactions With Solar Wind Plasma And Fields, 6295 Venus
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. At low altitudes most of these flux ropes are force-free, meaning that a dip in the thermal pressure is not needed to compensate for the magnetic pressure in the rope. However, many ropes at higher altitudes are not fully force-free and exhibit thermal pressure drops. We examine thermal pressure variations for many ropes and at various altitudes. We demonstrate that flux ropes are statistically force-free at low altitudes, and that there is no significant pressure variation across these ropes. However, at higher altitudes many ropes do display a thermal pressure variation across them and are not entirely force-free.
Cravens Thomas E.
Ledvina Stephen A.
Nunes Daniel C.
Tinker Jeremy L.
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