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Whistler-mode waves inside flux pileup region: Structured or unstructured?
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
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2014 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 119, no 11, p. 9089-9100Article in journal (Refereed) Published
Abstract [en]

During reconnection, a flux pileup region (FPR) is formed behind a dipolarization front in an outflow jet. Inside the FPR, the magnetic field magnitude and Bz component increase and the whistler-mode waves are observed frequently. As the FPR convects toward the Earth during substorms, it is obstructed by the dipolar geomagnetic field to form a near-Earth FPR. Unlike the structureless emissions inside the tail FPR, we find that the whistler-mode waves inside the near-Earth FPR can exhibit a discrete structure similar to chorus. Both upper band and lower band chorus are observed, with the upper band having a larger propagation angle (and smaller wave amplitude) than the lower band. Most chorus elements we observed are rising-tone type, but some are falling-tone type. We notice that the rising-tone chorus can evolve into falling-tone chorus within <3s. One of the factors that may explain why the waves are unstructured inside the tail FPR but become discrete inside the near-Earth FPR is the spatial inhomogeneity of magnetic field: we find that such inhomogeneity is small inside the near-Earth FPR but large inside the tail FPR.

Place, publisher, year, edition, pages
Blackwell Publishing, 2014. Vol. 119, no 11, p. 9089-9100
Keywords [en]
flux pileup region, dipolarization front, whistler, chorus, structure, magnetic field inhomogeneity
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-253247DOI: 10.1002/2014JA020204ISI: 000346792100026Scopus ID: 2-s2.0-84995595753OAI: oai:DiVA.org:kth-253247DiVA, id: diva2:1324668
Note

QC 20190625

Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2019-06-25Bibliographically approved

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Khotyaintsev, Yuri V.Vaivads, AndrisAndré, Mats

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