  We describe a method for identifying XMM-Newton observations that have been
affected by Solar Wind Charge Exchange (SWCX) emission and present preliminary
results of previously unidentified cases of such emission within the XMM-Newton
Science Archive. The method is based on detecting temporal variability in the
diffuse X-ray background. We judge the variability of a low energy band, taken
to represent the key indicators of charge exchange emission. We compare this to
the variability of a continuum band, which is expected to be non-varying, even
in the case when SWCX enhancement has occurred. We discuss previously published
results with SWCX contamination that have been tested with the above method. We
present a selection of observations that we consider to show previously
unpublished SWCX enhancements, and further investigate these observations for
correlation with data from the solar wind observatory, ACE. We also consider
the geometry and viewing angle of XMM-Newton at the time of the observation to
examine the origin of the charge exchange emission, whether it be from
interactions with geocoronal neutrals in Earth's magnetosheath or from the
heliosphere and heliopause.
