Venus dayside ionospheric conditions - Effects of ionospheric magnetic field and solar EUV flux

Details Venus dayside ionospheric conditions - Effects of ionospheric magnetic field and solar EUV flux Venus dayside ionospheric conditions - Effects of ionospheric magnetic field and solar EUV flux

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..124e&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, Feb. 1984, p. 124-127.

Physics

32

Extreme Ultraviolet Radiation, Ionospheric Electron Density, Planetary Ionospheres, Planetary Magnetic Fields, Solar Planetary Interactions, Solar Radiation, Venus Atmosphere, Cyclotron Frequency, Electron Energy, Ionic Collisions, Pioneer Venus Spacecraft, Pioneer Venus 1 Spacecraft, Solar Wind, Venus, Dayside, Ionosphere, Magnetic Fields, Magnetic Effects, Flux, Solar Radiation, Ultraviolet, Wavelengths, Solar Wind, Modulation, Pvo, Pioneer Venus, Orbiters, Langmuir Probe Experiment, Altitude, Models, Tec

Scientific paper

On the basis of in situ measurements of solar EUV flux, an investigation is conducted on the extent of EUV-contributed Venus dayside condition modulation as found in the Pioneer Venus Orbiter's Langmuir probe experiment. In addition, a novel method for Venus EUV flux measurement is introduced which relies on the Langmuir probe sensor's photoelectron emission in regions far above the ionosphere. It is found that while EUV flux strongly affects ionospheric number density, its electron temperature effects are minor. An examination of the role of ionospheric magnetic fields in dayside condition modulation shows that large scale horizontal field presence or absence has no effect on electron number density or temperature at these altitudes, due to the collision domination of ions and the fact that vertical diffusive transport is unimpeded by magnetic fields of the observed magnitudes.

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