Spectral properties of backscattered solar Ly-alpha radiation in the heliosphere: A search for heliospheric boundary effectsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We explore the imprints of the solar wind interaction with the local interstellar medium on spectral properties of backscattered solar Ly-alpha radiation. We employ a newly developed effective model for the interstellar H atom velocity distribution function in the heliosphere (Katushkina and Izmodenov, 2011). The 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, intensities, line-shifts and line-widths were computed at 1 AU for the anti-solar lines-of-sight. Then the intensities, line-shifts and line-widths are compared with those calculated by using more simplified one-component and two-component hot models. The largest differences between the new model and hot models are seen in the line-width of the backscattered Ly-alpha profiles. The line-width is very sensitive to the kinetic properties of the H atom distribution function after passing the interaction region between the solar wind and the interstellar medium. (C) 2011 COSPAR. Published by Elsevier Ltd. All rights reserved.