Solar cycle changes in the ionization sources of the nightside Venus ionosphere

Details Solar cycle changes in the ionization sources of the nightside Venus ionosphere Solar cycle changes in the ionization sources of the nightside Venus ionosphere

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9213391k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 1, 1987, p. 13391-13398.

Physics

41

Ion Sources, Planetary Ionospheres, Solar Cycles, Solar Wind, Venus Atmosphere, Electron Energy, Electron Impact, Ionopause, Knudsen Flow, Oxygen Ions, Plasma Density, Venus, Ionosphere, Ionization, Nightside, Source, Oxygen, Transport, Ions, Electrons, Impacts, Flux, Compression, Dayside, Ionopause, Altitude, Pressure, Solar Wind, Density, Data, Models, Kinetics, Experiments, Laboratory Studies, Particles

Scientific paper

Using new and previous experimental evidence, it is argued that the height-integrated flux of O(+) ions transported from the dayside Venus ionosphere into the nightside ionosphere is strongly reduced (shut off) at solar cycle minimum (SCmin) and that the electron impact source becomes the predominant nightside ionization source during this phase of the solar cycle. The height-integrated transterminator O(+) flux, which is probably the dominant nightside ionization source at solar cycle maximum (SCmax), is shut off at SCmin by compression of the dayside ionopause to low altitude. It is suggested that the ionopause is depressed because the dayside ionospheric kinetic pressure field is reduced by a factor of approximately 3 from its SCmas value and that the typical SCmin solar wind dynamic pressure, which is not less than the typical SCmax value, cannot be balanced by the ionospheric pressure field at altitudes above approximately 250 km.

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