Physics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9012047l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Dec. 1, 1985, p. 12,047-12,056.
Physics
16
Dynamo Theory, Magnetic Field Configurations, Magnetic Flux, Planetary Ionospheres, Venus Atmosphere, Convective Flow, Ionopause, Vertical Distribution, Venus, Ionosphere, Dynamo Theory, Formation, Flux Ropes, Magnetic Fields, Magnetic Properties, Kinematics, Convection, Flux, Ionopause, Plasma, Velocity, Collisions, Gravity Waves, Atmosphere, Altitude, Features
Scientific paper
Small scale (≡10 km) magnetic field structures or "flux ropes" observed in the ionosphere of Venus can be interpreted as the result of a kinematic dynamo process acting on weak seed fields. The seed fields result from the prevailing downward convection of magnetic flux from the vicinity of the ionopause, while small scale fluctuations in the velocity of the ionospheric plasma, which can be caused by collisional coupling to gravity waves in the neutral atmosphere, provide the mechanism by which the field is twisted and redistributed into features of similar scale. This mechanism naturally explains some of the average properties of flux ropes such as the variation of their characteristics with altitude and solar zenith angle. It also elucidates the relationship between the large scale and small scale ionospheric magnetic fields.
Elphic Richard C.
Luhmann Janet G.
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