Comparative analysis of low-altitude ENA emissions in two substorms
作者： N. Buzulukova , M.-C. Fok , E. Roelof , J. Redfern , J. Goldstein
DOI: 10.1002/JGRA.50103
关键词:
摘要: [1] We report on the dynamics of low-altitude energetic neutral atom (ENA) emissions during two substorms that occurred main phases storms: (1) a CIR-driven storm 11 October 2008 and (2) coronal mass ejection (CME)-driven 5 April 2010. For both these storms, we have complementary spacecraft ground-based observations. The dual-spacecraft Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) mission obtained ENA images containing (LAEs). Substorm is inferred from THEMIS all-sky imagers. TWINS-observed LAEs are compared with trapped/loss cone proton fluxes NOAA/MetOp constellation. We find timing intensity profiles different for selected events. event, rise substorm recovery phase phase. On 2010, tend to peak near onset. argue LAE behavior results pitch-angle distributions (PADs) ion source population. Ion PADs isotropic event empty loss 2010 event. cases, intensification marks onset activity in magnetotail precedes large conclude production starts transition region between ring current may expand/move into inner magnetosphere together formation.
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