Large-scale current systems in the dayside Venus ionosphere

Details Large-scale current systems in the dayside Venus ionosphere Large-scale current systems in the dayside Venus ionosphere

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3509l&link_type=abstract

Journal of Geophysical Research, vol. 86, May 1, 1981, p. 3509-3514.

Physics

14

Atmospheric Models, Cosmic Plasma, Ionospheric Currents, Planetary Ionospheres, Planetary Magnetic Fields, Plasma-Electromagnetic Interaction, Solar Wind, Venus Atmosphere, Atmospheric Composition, Atmospheric Density, Electric Fields, Electron Energy, Ionospheric Electron Density, Magnetometers, Particle Motion, Pioneer Venus 1 Spacecraft, Venus, Ionosphere, Dayside, Magnetic Fields, Pioneer Venus Orbiter, Magnetometer, Currents, Models, Altitude, Ions, Electrons, Comparisons, Density, Temperatures, Atmosp

Scientific paper

The occasional observation of large-scale horizontal magnetic fields within the dayside ionosphere of Venus by the flux gate magnetometer on the Pioneer Venus orbiter suggests the presence of large-scale current systems. Using the measured altitude profiles of the magnetic field and the electron density and temperature, together with the previously reported neutral atmosphere density and composition, it is found that the local ionosphere can be described at these times by a simple steady state model which treats the unobserved quantities, such as the electric field, as parameters. When the model is appropriate, the altitude profiles of the ion and electron velocities and the currents along the satellite trajectory can be inferred. These results elucidate the configurations and sources of the ionospheric current systems which produce the observed large-scale magnetic fields, and in particular illustrate the effect of ion-neutral coupling in the determination of the current system at low altitudes.

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