期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 402, 期 2, 页码 867-878出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15985.x
关键词
Sun: coronal mass ejections (CMEs); solar-terrestrial relations; interplanetary medium; X-rays: diffuse background; X-rays: general
资金
- Science and Technology Facilities Council, UK
- UK Space Agency [ST/G008647/1] Funding Source: researchfish
We present the analysis of an observation by XMM-Newton that exhibits strongly variable, low-energy diffuse X-ray line emission. We reason that this emission is due to localized solar wind charge exchange (SWCX), originating from a passing cloud of plasma associated with a Coronal mass ejection (CME) interacting with neutrals in the Earth's exosphere. This case of SWCX exhibits a much richer emission-line spectrum in comparison with previous examples of geocoronal SWCX or in interplanetary space. We show that emission from O-VIII is very prominent in the SWCX spectrum. The observed flux from oxygen ions of 18.9 keV cm(-2) s(-1) sr(-1) is consistent with SWCX resulting from a passing CME. Highly ionized silicon is also observed in the spectrum, and the presence of highly charged iron is an additional spectral indicator that we are observing emission from a CME. We argue that this is the same event detected by the solar wind monitors Advanced Composition Explorer and Wind which measured an intense increase in the solar wind flux due to a CME that had been released from the Sun 2 d previous to the XMM-Newton observation.
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