Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-02-26
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Prepared for submission to Advances in Space Research
Scientific paper
We explore imprints of the solar wind interaction with the local interstellar medium on spectral properties of the backscattered solar Ly-alpha radiation. We employ newly developed effective model for the interstellar H atom velocity distribution function in the heliosphere (Katushkina and Izmodenov 2010, 2011). This model takes into account both global effects of H atom perturbations at the heliospheric boundaries and local (i.e. within 10-20 AU from the Sun) effects of the solar ionization, charge exchange, solar gravitation and radiation pressure. Backscattered solar Ly-alpha profiles and their zero, first and second moments were computed at 1 AU for the anti-solar directions of line-of-sight. Then the moments are compared with the moments calculated by using more simplified one-component and two-component hot models. The comparison shows that the Ly-alpha intensities calculated in the frame of new model are somewhat smaller than those calculated by means of the simplified models. Small differences in the first moment (i.e. line-shift) are also observed in the downwind direction. The largest difference between new model and hot models is seen in the second moment of the backscattered Ly-alpha profile. This moment is also called as line-of-sight temperature or line-width of the backscattered spectra. The spectral width depends on the width of the H atom velocity distribution function within few AU from the Sun. We show that the line-widths calculated on the basis of the our model is qualitatively different from those of simplified models.
Izmodenov Vladislav V.
Katushkina Olga A.
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