Out-of-ecliptic Lyman-alpha observations with Pioneer-Venus - Solar wind anisotropy degree in 1986

Details Out-of-ecliptic Lyman-alpha observations with Pioneer-Venus - Solar wind anisotropy degree in 1986 Out-of-ecliptic Lyman-alpha observations with Pioneer-Venus - Solar wind anisotropy degree in 1986

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..600l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 2, Jan. 1990, p. 600-608.

Astronomy and Astrophysics

Astrophysics

19

Halley'S Comet, Lyman Alpha Radiation, Pioneer Venus Spacecraft, Solar Activity Effects, Solar Wind, Anisotropy, Hydrogen Atoms, Interstellar Matter, Resonance Scattering, Solar System, Pvo Mission, Spacecraft Observations, Lyman-Alpha Radiation, Solar Wind, Ouvs Instrument, Ionization, Latitude, Solar Radiation, Diagrams, Models, Parameters, Scattering, Distribution, Venus

Scientific paper

Measurements of interplanetary Lyman-alpha were made over a wide range of ecliptic latitudes by the Pioneer Venus Orbiter Ultraviolet Spectrometer during the tracking of Halley's comet from December 1985 to March 1986. By comparisons with models of the interstellar/interplanetary hydrogen wind, the total solar ionization lifetime at 1 AU is found to be 1.25-1.5 x 10 to the 6th sec, and its variation with solar latitude is found to be 30 + or - 5 percent. The solar wind mass flux variation with solar latitude is found to be very weak (0 + or - 10 percent). These values are appropriate to solar minimum. Comparison of the latitudinal variation with earlier measurements from 1973 to 1977 suggest that the asphericity of the solar wind may increase as solar activity passes through its minimum.

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