SAPS-associated explosive brightening on the dusk-side: A new type of onset-like disturbance: A new type of onset-like disturbance

Henderson, M. G.; Morley, S. K.; Kepko, L. E.

doi:10.1002/2017JA024472

Title: SAPS-associated explosive brightening on the dusk-side: A new type of onset-like disturbance: A new type of onset-like disturbance

Journal Article · 05 December 2017 · Journal of Geophysical Research. Space Physics

DOI: https://doi.org/10.1002/2017JA024472 · OSTI ID:1412861

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Nonlinear Studies (CNLS)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)

Quasi-periodic energetic particle injections have been observed at geosynchronous orbit on the dusk-side during a steady magnetospheric convection event. Here, we examine high resolution auroral imager data and ground magnetometer data associated with the first of these injections and conclude that it was not associated with classical substorm signatures. It is proposed that these injections are caused by the explosive non-linear growth of a shear-flow-ballooning instability in the region where sub-auroral polarization streams (SAPS) also occur. It is suggested that interchange will occur preferentially in the low-conductivity SAPS region since the magnetic Richardson number is lowest there and the ‘line-tying’ effect will also be least stabilizing there. We also propose that the observed particle injection signatures and auroral morphology constitute a new type of SAPS-associated explosive ‘onset-like’ disturbance that can occur during intervals of strong convection.

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Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1412861

Report Number(s):: LA-UR-17-24956

Journal Information:: Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 1 Vol. 123; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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