Temporal variations of geocoronal and heliospheric X-ray emission associated with the solar wind interaction with neutrals

Details Temporal variations of geocoronal and heliospheric X-ray emission associated with the solar wind interaction with neutrals Temporal variations of geocoronal and heliospheric X-ray emission associated with the solar wind interaction with neutrals

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10624883c&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A11, p. 24883-24892

Physics

50

Atmospheric Composition And Structure: Airglow And Aurora, Interplanetary Physics: Interstellar Gas, Interplanetary Physics: Solar Wind Plasma, Magnetospheric Physics: Magnetosheath

Scientific paper

X-ray emission due to charge transfer collisions between heavy solar wind ions and neutrals has been predicted to exist both in the heliosphere and in the geocorona. The heliospheric X-ray emission can account for roughly half of the observed soft X-ray background intensity. It was also suggested that temporal variations in the heliospheric and geocoronal soft X-ray intensities will result from solar wind variations. In this paper, a simple model of the charge exchange X-ray emission mechanism is combined with measured solar wind parameters as a function of time and used to generate predictions of the temporal variation of the X-ray intensity observed at Earth for the time periods 1990-1993 and 1996-1998. Measured solar wind proton fluxes are also directly compared with the ``long-term enhancement'' part of the soft X-ray background measured by the Röntgen Satellite (ROSAT). A significant positive correlation exists, which supports the existence of X-ray emission associated with the solar wind interaction with either interstellar neutrals and/or with geocoronal neutral hydrogen.

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