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Observed perturbations of the velocity distribution of interstellar hydrogen atoms in the solar system with Prognoz Lyman-alpha measurements

The interplanetary Lyman-alpha emission detected at five different points in the solar system by the Prognoz 5 and 6 satellites is due to resonance scattering of solar photons by H atoms of the local interstellar medium that are flowing at a negative relative velocity vector. A hydrogen absorption c...

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Published in:	Astronomy and astrophysics (Berlin) 1984-11, Vol.140 (2), p.243-250
Main Authors:	LALLEMENT, R, BERTAUX, J. L, KURT, V. G, MIRONOVA, E. N
Format:	Article
Language:	English
Subjects:	Astronomy Astrophysics Earth, ocean, space Exact sciences and technology Interplanetary space Sciences of the Universe Solar system
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container_title	Astronomy and astrophysics (Berlin)
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creator	LALLEMENT, R BERTAUX, J. L KURT, V. G MIRONOVA, E. N
description	The interplanetary Lyman-alpha emission detected at five different points in the solar system by the Prognoz 5 and 6 satellites is due to resonance scattering of solar photons by H atoms of the local interstellar medium that are flowing at a negative relative velocity vector. A hydrogen absorption cell is used to analyze spectral profiles, and a purely geometrical method is applied for data analysis. It is noted that when averaged along a line-of-sight, both the bulk velocity and the thermal velocity spread of H atoms are changing with position in the solar system; this confirms previously predicted effects of solar gravitation and the ionization of H atoms by solar wind and EUV radiation. Apparent heating is greater in the downwind direction.
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subjects	Astronomy Astrophysics Earth, ocean, space Exact sciences and technology Interplanetary space Sciences of the Universe Solar system
title	Observed perturbations of the velocity distribution of interstellar hydrogen atoms in the solar system with Prognoz Lyman-alpha measurements
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