Based on observations obtained with XMM-Newton, an ESAscience mission with instruments and contributions directly fundedby ESA Member States and NASA.

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In this case, the hardening of the primary spectrum should dominate over the steepening caused by the reduced scattering probability, possibly induced by the untwisting of the magnetosphere.

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... flux

Note that no blackbody component was detected in the Chandra spectrum. However, the data are consistent with the presence of a blackbody with the same parameters as in the XMM-Newton spectra (Rea et al. 2005), which have better statistical quality.

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