SM007-05
The association between slot-filling injections and subauroral (STEVE) emissions

Monday, 7 December 2020: 05:46
Virtual
Christopher M Cully1, Jean-Francois Ripoll2, Drew L Turner3, Geoffrey D Reeves4, Hilde Nesse Tyssøy5, Jared Pitzel1, D. Megan Gillies1, Eric Donovan1 and Emma Spanswick1, (1)University of Calgary, Calgary, AB, Canada, (2)CEA/DAM- ILE DE FRANCE, Arpajon, France, (3)Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States, (4)Los Alamos National Laboratory, Los Alamos, NM, United States, (5)University of Bergen, Birkeland Centre for Space Science (BCSS), Department of Physics and Technology, Bergen, Norway
Recorded Presentation
Abstract:
Driven by large-scale electric fields in the inner magnetosphere, energetic electrons have been observed to be injected into the slot region at L<4, reaching energies up to roughly 250 keV [e.g. Turner et al., 2015]. Persistent, narrow, poleward-directed electric fields (Sub-Auroral Polarization Streams, SAPS) are associated with the injection [Lejosne et al., 2018], and are also thought to drive characteristic optical emissions known as STEVE (Strong Thermal Emission Velocity Enhancement) events [e.g. Gallardo-Lacourt et al., 2018].

Using data from the Van Allen Probes in conjunction with ground-based data from TREx, THEMIS and the Canadian Geospace Observatory, we find a very strong association between deep (L<4) electron injections and STEVE emissions. We examine the spatial and temporal relationship between the injection and the STEVE emissions, and discuss the implications for electric field structure in the inner magnetosphere.

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