S. L. Snowden et al. 2009 ApJ 691 372 doi:10.1088/0004-637X/691/1/372
S. L. Snowden1, M. R. Collier2, T. Cravens3, K. D. Kuntz4, S. T. Lepri5, I. Robertson3 and L. Tomas6
Show affiliationsA long XMM-Newton exposure is used to observe solar wind charge exchange (SWCX) emission from exospheric material in and outside Earth's magnetosheath. The light curve of the O VII (0.5-0.62 keV) band is compared with a model for the expected emission, and while the emission is faint and the light curve has considerable scatter, the correlation is significant to better than 99.9%. This result demonstrates the validity of the geocoronal SWCX emission model for predicting a contribution to astrophysical observations to a scale factor of order unity (1.5). In addition, an average value of the SWCX O VII emission from the magnetosheath over the observation of 2.6 ± 0.5 LU is derived. The results also demonstrate the potential utility of using X-ray observations to study global phenomena of the magnetosheath which currently are only investigated using in situ measurements.
interplanetary medium; solar system: general; solar wind; X-rays: general; X-rays: ISM
Issue 1 (2009 January 20)
Received 2008 May 13, accepted for publication 2008 September 17
Published 2009 January 14
S. L. Snowden et al. 2009 ApJ 691 372
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