Long-Term Variation of the Interplanetary H Ly alpha Glow: Voyager Measurements and Implications for the Solar H Ly alpha Irradiance

Details Long-Term Variation of the Interplanetary H Ly alpha Glow: Voyager Measurements and Implications for the Solar H Ly alpha Irradiance Long-Term Variation of the Interplanetary H Ly alpha Glow: Voyager Measurements and Implications for the Solar H Ly alpha Irradiance

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...491..980d&link_type=abstract

Astrophysical Journal v.491, p.980

Astronomy and Astrophysics

Astronomy

10

Interplanetary Medium, Sun: Fundamental Parameters, Sun: Uv Radiation

Scientific paper

In this paper we study interplanetary (IP) Ly alpha data taken with the Voyager 1 and Voyager 2 spacecraft from 1980 to 1995. The coverage in time is equal to about 156 and 220 points yr-1 for Voyager 1 and Voyager 2, respectively, with almost no gaps. The IP Ly alpha data are normalized for spatial changes in the emissivity, which arise from variations in observing geometry, by using a radiative transfer model. The normalized data show the variation of the solar H Ly alpha line-center flux during the solar cycle. We compare this variation with the solar H Ly alpha irradiance measurements of integrated flux from the Solar Mesosphere Explorer and the Upper Atmosphere Research Satellite/Solar-Stellar Irradiance Comparison Experiment (SOLSTICE), and, when direct solar measurements are not available, we use estimated irradiances from magnesium and helium indices. The comparison between Voyager IP data and solar data shows that the best agreement is found with the SOLSTICE set of measurements, when no differences in the variation of the line-center flux and the integrated flux are taken into account.

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