Morphology and Ionization of the Interstellar Cloud Surrounding the Solar System

Details Morphology and Ionization of the Interstellar Cloud Surrounding the Solar System Morphology and Ionization of the Interstellar Cloud Surrounding the Solar System

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994sci...265.1423f&link_type=abstract

Science, Volume 265, Issue 5177, pp. 1423-1427

Computer Science

62

Scientific paper

The first encounter between the sun and the surrounding interstellar cloud appears to have occurred 2000 to 8000 years ago. The sun and cloud space motions are nearly perpendicular, an indication that the sun is skimming the cloud surface. The electron density derived for the surrounding cloud from the carbon component of the anomalous cosmic ray population in the solar system and from the interstellar ratio of Mg^+ to Mg^0 toward Sirius support an equilibrium model for cloud ionization (an electron density of 0.22 to 0.44 per cubic centimeter). The upwind magnetic field direction is nearly parallel to the cloud surface. The relative sun-cloud motion indicates that the solar system has a bow shock.

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