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Substorm-Related Near-Earth Reconnection Surge: Combining Telescopic and Microscopic Views
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2019 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 46, no 12, p. 6239-6247Article in journal (Refereed) Published
Abstract [en]

A strong ~11-min-long surge of the lobe reconnection was observed during a substorm on the tailward side of the near-Earth neutral line. In the southern lobe near the reconnection separatrix the MMS spacecraft observed short-duration earthward electron beams providing the local Hall current, tailward propagating Alfven wave (AW) bursts with Poynting flux up to 10−4 W/m2, and large-amplitude E field spikes (e-holes) and low hybrid waves. The reconnection surge was accompanied by substorm current wedge formation and fast poleward expansion of auroral bulge-related westward electrojet in the conjugate ionosphere. During its meridional crossing above the expanding bulge the Metop-2 spacecraft observed an intense energetic precipitation spike near the expected X line foot point and confirmed the dipolarized character of magnetic field lines inside of the bulge. Globally the observed average reconnection rate (<Ey > ~3.3 mV/m) was sufficient to produce the magnetic flux increase in the bulge, associated with observed fast poleward expansion (about 6° latitude in 5 min).

Place, publisher, year, edition, pages
Blackwell Publishing, 2019. Vol. 46, no 12, p. 6239-6247
Keywords [en]
magnetic reconnection, magnetotail, plasma sheet, poleward expansion, precipitation, substorms
National Category
Geophysics
Identifiers
URN: urn:nbn:se:kth:diva-262615DOI: 10.1029/2019GL083057ISI: 000477616300010Scopus ID: 2-s2.0-85068169133OAI: oai:DiVA.org:kth-262615DiVA, id: diva2:1361990
Note

QC 20191017

Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-17Bibliographically approved

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Lindqvist, Per-Arne

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