Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.4408f&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #44.08; Bulletin of the American Astronomical Society, Vol. 28, p.893
Astronomy and Astrophysics
Astronomy
2
Scientific paper
A model for the small scale structure, kinematics and origin of interstellar gas near the Sun is presented. The salient feature of this model is that the LISM properties can be explained if a fragment of an expanding superbubble shell, due to stellar activity in the Scorpius-Ophiuchus Association (SCA), has encompassed the Sun. For instance, the observed small scale structure ( ~ 1 velocity component per 1.5 pc), kinematics (consistent with superbubble shell models), and magnetic field (consistent with field embedded in superbubble shell) support the view that the Sun is at the edge of, or embedded in, the fragmenting shell. The expansion of the Loop I shock front was halted by collision with the Aquila Rift molecular cloud, as is seen by comparing the low latitude radio continuum extension of the North Polar Spur with CO maps. This collision appears to have ablated material from the molecular cloud, accounting for the larger nearby column densities in the longitude interval 0(o}-60({o)) compared to the opposite direction towards CMa. The fragmenting superbubble shell is a likely site for the location of dense ( ~ 10(5) cm(-3) ) small (<100 au) features found to contain up to 15% of diffuse ISM. Thus, an encounter between the Sun and a dense interstellar cloud fragment within the next 10(5) years becomes a possibility. Such an encounter would have a dramatic effect on the galactic environment of the Sun, the physical properties of the heliosphere, the physical properties of the Earth's magnetosphere, mesosphere chemistry, and possibly also the terrestrial climate.
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