Formation and dynamics of large-scale magnetic structures in the ionosphere of Venus

Details Formation and dynamics of large-scale magnetic structures in the ionosphere of Venus Formation and dynamics of large-scale magnetic structures in the ionosphere of Venus

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.2401c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, April 1, 1984, p. 2401-2405.

Astronomy and Astrophysics

Astrophysics

22

Ionospheric Currents, Magnetic Diffusion, Planetary Ionospheres, Planetary Magnetic Fields, Solar Planetary Interactions, Solar Wind, Venus Atmosphere, Convection, Kelvin-Helmholtz Instability, Magnetic Flux, Plasma Dynamics, Space Plasmas, Venus, Ionosphere, Formation, Dynamics, Magnetic Properties, Structure, Convection, Solar Wind, Plasma, Absorbtion, Atmosphere, Magnetic Fields, Currents, Patterns, Diffusion, Comparisons, Calculations, Ionopause

Scientific paper

The formation and dynamics of large-scale magnetic structures in the ionosphere of Venus are examined. It is shown that such structures must be the result of steady state convection of interplanetary field lines into the ionosphere by the small amount of solar wind plasma (less than or approximately equal to 1-5 percent) absorbed by the planetary atmosphere below the ionopause, rather than isolated remnants of large fields persisting for long periods without connection to the solar wind induced current and convection pattern. In particular, it is demonstrated that the magnetic diffusion of such structures would result in their dissipation with time scales of 1-10 min, if they were not steady state structures in convective and diffusive equilibriuim. It is shown that the equations governing the diffusion of these magnetic structures are similar to those governing diffusion of a gas out of an enclosed chamber with a porous wall, and a simple analog is illustrated. The application of these results to magnetic fields of astrophysical plasmas is discussed.

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