The location of the dayside ionopause of Venus - Pioneer Venus Orbiter magnetometer observations

Details The location of the dayside ionopause of Venus - Pioneer Venus Orbiter magnetometer observations The location of the dayside ionopause of Venus - Pioneer Venus Orbiter magnetometer observations

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..561e&link_type=abstract

Geophysical Research Letters, vol. 7, Aug. 1980, p. 561-564.

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Daytime, Magnetometers, Planetary Ionospheres, Venus Atmosphere, Ionospheric Temperature, Isothermal Processes, Pioneer Venus 1 Spacecraft, Plasma Dynamics, Pressure Effects, Solar Wind, Terminator Lines, Venus, Ionopause, Dayside, Magnetometer, Position (Location), Data, Pioneer Venus Orbiter, Pressure, Ionosphere, Temperatures, Altitude, Solar Wind, Distribution, Parameters, Ionosheath

Scientific paper

The location of the dayside Venus ionopause, as observed by the Pioneer Venus Orbiter, is shown to depend on the magnetic pressure in the shocked, highly compressed solar wind plasma just outside the ionopause. Assuming a balance exclusively between this external magnetic pressure and internal ionospheric thermal pressure, invariance of ionospheric conditions, and an isothermal ionosphere, it is possible to determine pressure scale heights for various solar zenith angle intervals. These scale heights yield ionospheric temperatures which agree with direct measurements obtained independently. Not surprisingly, the average ionopause altitude is higher near the terminator, where the average external magnetic pressure is lower. The near-terminator ionopause has much greater positional variability than that at lower solar zenith angles; this appears to be due principally to concomitant variations in the external magnetic pressure, presumably related to solar wind pressure changes.

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