|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
Authors Abstract: N
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.
English Abstract: Y
Pub. Type: ARTICLE
ISI Order #: KM427 (For ordering reprints from ISI)