Response of nightside ionosphere and ionotail of Venus to variations in solar EUV and solar wind dynamic pressure

Details Response of nightside ionosphere and ionotail of Venus to variations in solar EUV and solar wind dynamic pressure Response of nightside ionosphere and ionotail of Venus to variations in solar EUV and solar wind dynamic pressure

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.4075b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 4075-4084.

Physics

22

Night Sky, Planetary Ionospheres, Solar Planetary Interactions, Solar Radiation, Solar Wind, Venus Atmosphere, Extreme Ultraviolet Radiation, Pioneer Venus 1 Spacecraft, Solar Flux, Venus, Nightside, Ionosphere, Ultraviolet, Wavelengths, Solar Effects, Solar Wind, Dynamics, Pressure, Spacecraft Observations, Pvo Mission, Electrons, Density, Flux, Altitude, Flow, Ions, Solar Cycles, Oetp Instrument

Scientific paper

Pioneer Venus in situ measurements of N(e), total solar EUV flux, and solar wind dynamic pressure P(sw) are used to investigate the solar cycle and orbit-to-orbit variations of the Venus nightside ionosphere. It is found that the density of the main body of the nightside ionosphere below 600 km responds to the solar wind dynamic pressure variations in much the same way that the density of the ionotail does: both regions are depleted at times of high P(sw). Solar cycle variations in the EUV flux near solar minimum produce very large changes in the electron density in ionotail, changes that are consistent with the ionotail being supplied by nightward ion flow. However, short-term variations in the EUV flux produce a weak negative response in the density at altitudes between 150 and 600 km, at least at solar maximum. The nightside variations are consistent with enhanced solar wind scavenging of plasma from the nightside ionosphere during periods of higher P(sw).

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