ROSAT X-ray Observations of the Primary and Secondary Streams of Interstellar Neutral Atoms

Details ROSAT X-ray Observations of the Primary and Secondary Streams of Interstellar Neutral Atoms ROSAT X-ray Observations of the Primary and Secondary Streams of Interstellar Neutral Atoms

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh11c1123c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH11C-1123

Physics

5757 Remote Sensing, 7554 X Rays, Gamma Rays, And Neutrinos, 7837 Neutral Particles

Scientific paper

Heavy neutral atoms entering the heliosphere from the interstellar wind are focused downstream of the Sun into a focusing cone, creating a region of enhanced neutral density. Solar wind high charge state ions charge exchange with these neutrals and, in the process, emit soft X-rays ( ˜0.25 keV). In this presentation, we discuss ROSAT X-ray observations of both the primary and secondary streams of interstellar neutral atoms [Collier et al., Adv. Space Res., in press, 2003]. Results of the analysis indicate a value of α consistent with about 6x10-16 eV cm2 (e.g. Cravens, T.E., Ap. J., 532:L153, 2000, eq. 2), a heliospheric contribution to the total X-ray flux ranging from about 18% at about five-ten degrees off the downstream axis to about 40% directly above the downstream axis viewing southward, and a secondary stream entering the heliosphere from above the ecliptic plane which may contain 3-4 times more neutral density at 1 AU than the primary stream, at least during the time of the ROSAT All-Sky Survey. The origin, properties and implications of this secondary stream need to be examined before we can have any confidence that our understanding of the heliosphere is not flawed.

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