Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...532l.153c&link_type=abstract
The Astrophysical Journal, Volume 532, Issue 2, pp. L153-L156.
Astronomy and Astrophysics
Astronomy
109
Atomic Processes, Ism: Atoms, Sun: Solar Wind, X-Rays: General
Scientific paper
X-rays should be generated throughout the heliosphere as a consequence of charge transfer collisions between heavy (Z>2) solar wind ions and interstellar neutrals. The high charge state solar wind ions resulting from these collisions are left in highly excited states and emit extreme ultraviolet or soft X-ray photons. This solar wind charge exchange mechanism applied to cometary neutrals has been used to explain the soft X-ray emission observed from comets. A simple model demonstrates that heliospheric X-ray emission can account for about 25%-50% of the observed soft X-ray background intensities. The spatial and temporal variations of heliospheric X-ray emission should reflect variations in the solar wind flux and composition as well as variations in the distribution of interstellar neutrals within the heliosphere. The heliospheric X-ray ``background'' can perhaps be identified with the ``long-term enhancements'' in the soft X-ray background measured by ROSAT.
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