HR: 1340h
AN: SH43A-1094    [Abstracts]
TI: Consequences of Variations in the Galactic Environment of the Sun on the Inner Heliosphere
AU: * Frisch, P C
EM: frisch@oddjob.uchicago.edu
AF: University of Chicago Department of Astronomy and Astrophysics, 5640 South Ellis Avenue, Chicago, IL 60637
AB: The physical properties of the cloud surrounding the solar system vary over timescales of $<<10^5$ years because both the Sun and interstellar clouds move through space. Within the past $10^3$ to $10^5$ years the Sun emerged from a large void ($>$80 parsecs radius)in interstellar gas and entered an outflow of material from the Scorpius-Centaurus Association. The absence of neutral gas in the void indicates that anomalous cosmic rays (E $~<$ 0.5 GeV/nucleon) would have been absent from the inner heliosphere when the Sun was in the void. Other temporal variations in the galactic environment of the Sun as affecting the heliosphere are discussed.
UR: http://xxx.lanl.gov/abs/astro-ph/0405167
DE: 2100 INTERPLANETARY PHYSICS
DE: 2124 Heliopause and solar wind termination
DE: 2144 Interstellar gas
DE: 2151 Neutral particles
DE: 1600 GLOBAL CHANGE (New category)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting