Time scales for the decay of induced large-scale magnetic fields in the Venus ionosphere

Details Time scales for the decay of induced large-scale magnetic fields in the Venus ionosphere Time scales for the decay of induced large-scale magnetic fields in the Venus ionosphere

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..362l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 362-368.

Physics

46

Planetary Ionospheres, Planetary Magnetic Fields, Solar Planetary Interactions, Venus Atmosphere, Atmospheric Models, Diffusion Coefficient, Magnetic Field Configurations, Magnetosheath, Pioneer Venus 1 Spacecraft, Plasma Drift, Radiation Pressure, Solar Wind, Venus, Ionosphere, Time Dependency, Decay, Magnetic Fields, Orbiters, Pioneer Venus, Magnetometer, Dayside, Solar Wind, Pressure, Dynamics, Structure, Models, Atmosphere, Evolution, Diffusion, Convection, Pvo, Electrons, Collisions, Velocity, Plasmas,

Scientific paper

Observations made with the aid of a magnetometer on the Pioneer Venus Orbiter have shown large-scale horizontal magnetic fields in the dayside ionosphere of Venus. According to Cloutier and Daniell (1981), the observed magnetic structures may be quasi-steady features produced by an ionospheric current system driven by solar wind interaction. Russell et al. (1983) have suggested that the altitude profiles of the horizontal field on different orbits exhibit a pattern which can be interpreted as phases in the temporal evolution of an initial state in which the ionosphere was permeated with magnetosheath-like fields. The present investigation is concerned with the argument in favor of a temporal versus spatial explanation for some of the observed field structure. A calculation indicates that the diffusion time for ionospheric fields is long enough to justify attributing the observed fields to the 'memory' of the Venus ionosphere in certain regions.

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