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University of Southern California


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Database: Current Contents(tm) from ISI
Copyright 1992, 1995 Institute for Scientific Information, all rights reserved.

    Author: FAHR-H-J*; RUCINSKI-D; JUDGE-D-L

    Title: TIME-VARIABLE AND SPACE-VARIABLE STRUCTURES OF INTERSTELLAR GAS PASSING OVER THE HELIOSPHERE - CONSEQUENCES FOR THE INTERPLANETARY UV RESONANCE GLOW

    Source: ASTRONOMY AND ASTROPHYSICS, vol. 268, issue 2, (FEB, 1993) : pp. 792-804.

    Abstract: It has been known for two decades that neutral interstellar gases penetrate into the inner heliosphere and, in correspondence with their spatial distribution there, give rise to specific interplanetary resonance glows, e.g. of hydrogen and helium. In theoretical modellings of this scenario so far only a stationary and homogeneous inflow of neutral gases has been treated. However, there are several good reasons to expect that the solar system, since propagating through the ambient interstellar medium with a peculiar velocity of about 23 km s-1, may in reality be swept over by an inhomogeneous gaseous medium resulting in time-variable inflow parameters at its border. Here we are going to theoretically study for the first time such a situation in terms of resulting, time-dependent heliospheric density distributions and associated resonance glow structures. We are presenting quantitative theoretical results for a large number of LISM fluctuation periods and amplitudes by which time- and space-variable LISM conditions are described. It is especially evident that fluctuation periods of between 20 to 100 years may give noticeable imprints on the upwind/downwind glow structures. Finally we are going to show that effects of time-dependent LISM boundary conditions at least may be partly responsible for presently unexplained inconsistencies at the attempt to give a synoptic interpretation of distant upwind and downwind glow data as obtained by PROG-NOZ, PIONEER and VOYAGER Lyman-Alpha photometers and spectrometers, respectively.

Authors Abstract: N
English Abstract: Y
Language: eng
Pub. Type: ARTICLE
References: 45
ISSN: 0004-6361
ISI Order #: KM427 (For ordering reprints from ISI)
 
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