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Author: BLUM-P; GANGOPADHYAY-P; OGAWA-H-S; JUDGE-D-L
Authors Abstract: N
Title: SOLAR-DRIVEN NEUTRAL DENSITY WAVES
Source: ASTRONOMY AND ASTROPHYSICS, vol. 272, issue 2, (MAY, 1993)
: pp. 549-554.
Abstract: Interstellar neutral hydrogen atoms flowing into the solar
system are attracted by the solar gravitational force, repelled
by solar hydrogen Ly-alpha radiation pressure, and are ionized,
primarily, through charge exchange with the solar wind protons.
The solar cycle variation of the radiation pressure causes the
net central solar force to fluctuate between attraction and
repulsion resulting in the modulation of the neutral hydrogen
density about the usual time independent model. The calculation
presented here shows that the time dependent downstream density
is strongly modulated by a large number of travelling neutral
density waves. The waves possess a continuous range of
wavelengths as is to be expected for a Maxwellian gas subjected
to several eleven year solar cycle variations during its journey
through the solar system. The amplitudes of the density
modulation were found to be quite large. The backscattered glow
was found to depend on the position of the detector and the
phase of the solar cycle. At the most favorable condition a
deviation of the order of 25% from the time independent glow
might be observed.
English Abstract: Y
Pub. Type: ARTICLE
Subject Cat: BU: ASTRONOMY AND ASTROPHYSICS. ISI Order #: LC646 (For ordering reprints from ISI)