English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report the discovery of a geocoronal solar wind charge exchange (SWCX)event corresponding to the well-known 2006 December 13th coronal mass ejection(CME) event. Strong evidence for the charge exchange origin of this transientdiffuse emission is provided by prominent non-thermal emission lines atenergies of $\rm O^{7+}$, $\rm Ne^{9+}$, $\rm Mg^{11+}$, $\rm Si^{12+}$, $\rmSi^{13+}$. Especially, a 0.53 keV emission line that most likely arises fromthe $\rm N^{5+}$ $1s^1 5p^1 \to 1s^2$ transition is detected. Previously, theforecastability of SWCX occurrence with proton flares has been disputed. Inthis particular event, we found that the SWCX signal coincided with the arrivalof the magnetic cloud inside CME, triggered with a time delay after the protonflux fluctuation as the CME shock front passed through the Earth. Moreover, aspacecraft orbital modulation in SWCX light curve suggests that the emissionarises close to the Earth. The line of sight was found to always pass throughthe northern magnetospheric cusp. The SWCX intensity was high when the line ofsight passed the dusk side of the cusp, suggesting an azimuthal anisotropy inthe flow of solar-wind ions inside the cusp. An axisymmetric SWCX emissionmodel is found to underestimate the observed peak intensity by a factor ofabout 50. We suggest this discrepancy is related to the azimuthal anisotropy ofthe solar-wind flow in the cusp.

Geocoronal Solar Wind Charge Exchange Process Associated with the 2006-December-13 Coronal Mass Ejection Event