Global characteristics of magnetic flux ropes in the Venus ionosphere

Details Global characteristics of magnetic flux ropes in the Venus ionosphere Global characteristics of magnetic flux ropes in the Venus ionosphere

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.2993e&link_type=abstract

Journal of Geophysical Research, vol. 88, Apr. 1, 1983, p. 2993-3003.

Physics

15

Magnetic Field Configurations, Magnetic Flux, Planetary Ionospheres, Planetary Magnetic Fields, Synoptic Measurement, Venus Atmosphere, Field Aligned Currents, Ionospheric Currents, Polar Regions, Spatial Distribution, Zenith, Venus, Ionosphere, Flux Ropes, Magnetic Properties, Characteristics, Structure, Features, Pioneer Venus Orbiter, Pvo, Altitudes, Radii

Scientific paper

An examination is undertaken of global characteristics of Venus ionosphere magnetic flux ropes, whose maximum spatial occurrence at 165-km altitude occupies more than half of the ionospheric volume. Ropes above 200 km altitude in the low zenith angle regions appear to have quasi-horizontal orientations, while those below that altitude tend to be quasi-vertical. High zenith angle cases tend to be horizontal above 300 km, and randomly oriented below that altitude. Ropes may be more tightly 'twisted' at low than at high altitudes, especially in the low zenith angle regions. Rope field strengths are highest near the altitudes where their occurrence is greatest, and scale with the square root of the ambient thermal pressure. The global polarities of flux rope field-aligned currents seem to be random and do not support a steady, nonturbulent global formation mechanism.

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