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Solar cycle modulation of the interstellar hydrogen density distribution in the heliosphere

  • Session 5: Interstellar Gas and Cosmic Dust
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Abstract

A new approach taking explicitly into account time dependent variations of the solar radiation pressure and ionisation rate is developed for more realistic description of the distribution of the hot (∼800 K) interstellar hydrogen gas within the heliosphere. It is shown that the solar cycle-related variabilities cause temporal modulation of the hydrogen density patterns, manifested by propagation of density waves smearing out only beyond about 20 AU and 60 AU in the upwind and downwind directions, respectively. Density variations induce modulation of the size of hydrogen cavity by ∼15% around the mean value, affect (mainly in the antiapex direction) the location of the maximum emissivity region (MER) contributing to the Lyman-α backseattered glow, and lead to a significant temporal modulation of the upwind-todownwind Lyman-α intensity ratio as seen from the inner Solar System.

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Authors and Affiliations

  1. Space Research Centre of the Polish Academy of Sciences, Bartycka 18A, 00-716, Warsaw, Poland

    M. Bzowski & D. Rucinski

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  1. M. Bzowski
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  2. D. Rucinski
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Bzowski, M., Rucinski, D. Solar cycle modulation of the interstellar hydrogen density distribution in the heliosphere. Space Sci Rev 72, 467–470 (1995). https://doi.org/10.1007/BF00768821

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  • DOI: https://doi.org/10.1007/BF00768821

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