A high charge state Coronal Mass Ejection seen through solar wind charge exchange emission as detected by XMM-Newton - Astrophysics > High Energy Astrophysical PhenomenaReportar como inadecuado




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Abstract: We present the analysis of an observation by XMM-Newton that exhibitsstrongly variable, low-energy diffuse X-ray line emission. We reason that thisemission is due to localised solar wind charge exchange SWCX, originatingfrom a passing cloud of plasma associated with a Coronal Mass Ejection CMEinteracting with neutrals in the Earth-s exosphere. This case of SWCX exhibitsa much richer emission line spectrum in comparison with previous examples ofgeocoronal SWCX or in interplanetary space. We show that emission from OVIII isvery prominent in the SWCX spectrum. The observed flux from oxygen ions of 18.9keV cm-2 s-1 sr-1 is consistent with SWCX resulting from a passing CME. Highlyionised silicon is also observed in the spectrum, and the presence of highlycharged iron is an additional spectral indicator that we are observing emissionfrom a CME. We argue that this is the same event detected by the solar windmonitors ACE and Wind which measured an intense increase in the solar wind fluxdue to a CME that had been released from the Sun two days previous to theXMM-Newton observation.



Autor: J. A Carter, S. Sembay, A. M. Read

Fuente: https://arxiv.org/







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