Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9303f&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #93.03; Bulletin of the American Astronomical Society, Vol. 24, p.1268
Astronomy and Astrophysics
Astronomy
Scientific paper
The solar system is embedded in the edge of a low density interstellar cloud which is part of an evolved superbubble due to stars in the Scorpius-Centaurus constellations. The physical properties of this cloud set the boundary conditions of the solar system. The range of viable pressures for the present day ambient interstellar cloud is presented as a function of the cloud model, giving a relatively large radius for the heliopause. The pressure in this warm low density ambient interstellar cloud is dominated by magnetic and cosmic ray pressures, suggesting that the neglect of these terms in ISM models is not justified. In addition, the absense of regions with high interstellar pressure in the third galactic quadrant suggests the solar system has a historically large heliopause radius (greater than 75 au). This research has been supported by NASA grant NAGW-2610.
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