期刊
ASTROPHYSICAL JOURNAL
卷 532, 期 2, 页码 L153-L156出版社
IOP PUBLISHING LTD
DOI: 10.1086/312574
关键词
atomic processes; ISM : atoms; solar wind; X-rays : general
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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