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The Dynamics of the Alfvénic Oval
The auroral oval is a well-established concept, introduced more than five decades ago. The Alfvénic oval, on the other hand, is a very recent concept, which has been revealed in both observational and numerical studies. This is the first review of the global Alfvénic oval, while also defining primary, secondary and tertiary layers of the Alfvénic oval. The focus lies on the large-scale dynamic properties of the global Alfvénic oval in relation to the AE index, substorm phases, storm phases and solar wind/IMF conditions. ...
Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: aug
YEAR: 2021   DOI: 10.1016/j.jastp.2021.105616
AURORA; Alfven wave; Energy transport; geomagnetic activity; magnetosphere-ionosphere coupling; Wave-particle interaction
Temporal evolution of substorm-driven global Alfv\ en wave power above the auroral acceleration region
The onset of substorms is associated with bursty enhancements of Alfv\ en wave power throughout the magnetotail. While impossible to assess the total Alfv\ en wave power in the entire magnetotail, we have instead monitored waves that are funneled into the auroral acceleration region, in order to assess the temporal evolution of Alfv\ en wave power above the nightside auroral zone in relation to substorm phases. The substorms were grouped by three conditions: nonstorm periods, storm periods, and all (unc ...
Keiling, Andreas; Thaller, Scott; Dombeck, John; Wygant, John;
Published by: Journal of Geophysical Research: Space Physics Published on: 03/2020
YEAR: 2020   DOI: 10.1029/2019JA027444
Alfven wave; Alfvenic electron; AURORA; auroral acceleration; magnetotail; Substorm