Modulation of interplanetary hydrogen density distribution during the solar cycle.

Details Modulation of interplanetary hydrogen density distribution during the solar cycle. Modulation of interplanetary hydrogen density distribution during the solar cycle.

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...296..248r&link_type=abstract

Astronomy and Astrophysics, v.296, p.248

Astronomy and Astrophysics

Astrophysics

45

Interplanetary Medium, Sun: Activity, Solar Neighbourhood, Methods: Numerical, Ism: General

Scientific paper

A new, time-dependent model including variation of the solar radiation pressure and ionisation rate due to solar cycle-related effects is developed for a more realistic description of the density distribution of the hot (~8000K) hydrogen gas of interstellar origin in the interplanetary space. It is shown that these temporal variabilities induce significant modulation of the hydrogen density, especially pronounced in the inner Solar System. The resulting density waves may propagate throughout a large part of the heliosphere, before being practically damped out beyond ~20AU in the upwind direction and ~60AU in the downwind region, correspondingly. The solar cycle-related density variations lead to periodic "breathing" of hydrogen cavity, whose size varies by ~15% around the mean value, reaching its maximum size during solar minimum conditions. The effect of the hydrogen density variations on the location of the maximum emissivity region (MER) contributing to the interplanetary Lyman-α glow is briefly discussed. It is also shown that the mentioned solar cycle effects induce variation of the intensity of the interplanetary Lyman-α glow as seen from the inner Solar System not only due to the modulation of the solar Lyman-α illumination but also via induced temporal modifications of the hydrogen density distribution. However, at large heliocentric distances the long-term solar variabilities affect the backscattered Lyman-α intensity practically only due to solar Lyman-α instantaneous illumination variations. Therefore possible discrepancies between the features observed by deep space probes and inferred from the conventional "hot" model cannot be ascribed to the neglect of the solar cycle effects in modelling of the hydrogen density distribution.

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