Comparison between solar wind latitude distribution derived from Lyman-alpha observations and ULYSSES measurements

Details Comparison between solar wind latitude distribution derived from Lyman-alpha observations and ULYSSES measurements Comparison between solar wind latitude distribution derived from Lyman-alpha observations and ULYSSES measurements

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...96q&link_type=abstract

Centre National de la Recherche Scientifique, International Solar Wind 8 Conference, p. 96

Physics

Lyman Alpha Radiation, Solar Wind, Solar Wind Velocity, Wind Velocity Measurement, Velocity Distribution, Latitude Measurement, Mass Flow Rate, Mass Distribution, Wind Variations, Sun, Solar Activity Effects, Solar Physics, Mathematical Models, Ulysses Mission, Sine Waves, All Sky Photography, Time Series Analysis, Prognoz Satellites, Harmonic Radiation

Scientific paper

The all-sky interplanetary Lyman-alpha pattern is sensitive to the latitude distribution of the solar wind because of destruction of neutral H by charge-exchange with solar wind protons. Lyman-alpha intensities recorded by Prognoz 5 and 6 in 1976 in a few parts of the sky were demonstrating a decrease of solar wind mass flux by about 30 % from equator to pole, when assuming a sinusoidal variation of this mass flux (harmonic distribution). A new analysis with a discrete variation with latitude has shown a decrease from 0 to 30 deg and then a plateau of constant mass flux up to the pole. This distribution bears a striking resemblance with Ulysses in-situ measurements, showing a clear similarity at 19 years interval. The Ulysses measurements were then used as a model input to calculate an all-sky Lyman-alpha pattern, either with a discrete model or with a harmonic solar wind variation with the same Ulysses equator-to-pole variation. There are conspicuous differences between the two Lyman-alpha patterns, in particular in the downwind region which are discussed in the context of future all-sky measurements with SWAN experiment on SOHO.

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