Sequential Observations of Flux Transfer Events, Poleward‐Moving Auroral Forms, and Polar Cap Patches
Name
JGR Space Physics - 2020 - Hwang - Sequential Observations of Flux Transfer Events Poleward‐Moving Auroral Forms and.pdf
Description
Published version
Size
5.76 MB
Format
Adobe PDF
Checksum (MD5)
7791a5ae4800fcc030e388534dfaa374
Author(s)
Hwang, K‐J
Nishimura, Y
Coster, AJ
Gillies, RG
Fear, RC
Fuselier, SA
Petrinec, SM
Burch, JL
Dokgo, K
Sibeck, DG
Date Issued
May 20, 2020
Journal
Journal of Geophysical Research: Space Physics
Publisher
American Geophysical Union
Citation
Hwang, K.-J., Nishimura, Y., Coster, A. J., Gillies, R. G., Fear, R. C., Fuselier, S. A., et al. (2020). Sequential observations of flux transfer events, poleward-moving auroral forms, and polar cap patches. Journal of Geophysical Research: Space Physics, 125, e2019JA027674.
Version
Final published version
Abstract
We report the observation of solar wind‐magnetosphere‐ionosphere interactions using a series of flux transfer events (FTEs) observed by Magnetospheric MultiScale (MMS) mission located near the dayside magnetopause on 18 December 2017. The FTEs were observed to propagate duskward and either southward or slightly northward, as predicted under duskward and southward interplanetary magnetic field (IMF). The Cooling model also predicted a significant dawnward propagation of northward‐moving FTEs. Near the MMS footprint, a series of poleward‐moving auroral forms (PMAFs) occurred almost simultaneously with those FTEs. They propagated poleward and westward, consistent with the modeled FTE propagation. The intervals between FTEs, relatively consistent with those between PMAFs, strongly suggest a one‐to‐one correspondence between the dayside transients and ionospheric responses. The FTEs embedded in continuous reconnection observed by MMS and corresponding PMAFs individually occurred during persistent auroral activity recorded by an all‐sky imager strongly indicate that those FTEs/PMAFs resulted from the temporal modulation of the reconnection rate during continuous reconnection. With the decay of the PMAFs associated with the FTEs, patch‐like plasma density enhancements were detected to form and propagate poleward and then dawnward. Propagation to the dawn was also suggested by the Super Dual Auroral Radar Network (SuperDARN) convection and Global Positioning System (GPS) total electron content data. We relate the temporal variation of the driving solar‐wind and magnetospheric mechanism to that of the high‐latitude and polar ionospheric responses and estimate the response time.
MIT Department
Haystack Observatory
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Creative Commons Attribution-NonCommercial-NoDerivatives
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DOI of Published Version
https://doi.org/10.1029/2019ja027674
