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Evidence for the braking of flow bursts as they propagate toward the Earth
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.ORCID-id: 0000-0003-1270-1616
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2014 (Engelska)Ingår i: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 119, nr 11, s. 9004-9018Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this article we use energy conversion arguments to investigate the possible braking of flow bursts as they propagate toward the Earth. By using EJ data (E and J are the electric field and the current density) observed by Cluster in the magnetotail plasma sheet, we find indications of a plasma deceleration in the region -20 R-E < X < - 15 R-E. Our results suggest a braking mechanism where compressed magnetic flux tubes in so-called dipolarization fronts (DFs) can decelerate incoming flow bursts. Our results also show that energy conversion arguments can be used for studying flow braking and that the position of the flow velocity peak with respect to the DF can be used as a single-spacecraft proxy when determining energy conversion properties. Such a single-spacecraft proxy is invaluable whenever multispacecraft data are not available. In a superposed epoch study, we find that a flow burst with the velocity peak behind the DF is likely to decelerate and transfer energy from the particles to the fields. For flow bursts with the peak flow at or ahead of the DF we see no indications of braking, but instead we find an energy transfer from the fields to the particles. From our results we obtain an estimate of the magnitude of the deceleration of the flow bursts, and we find that it is consistent with previous investigations.

Ort, förlag, år, upplaga, sidor
2014. Vol. 119, nr 11, s. 9004-9018
Nyckelord [en]
bursty bulk flow, braking, energy conversion, dipolarization front, plasma sheet, flux pileup region
Nationell ämneskategori
Astronomi, astrofysik och kosmologi
Identifikatorer
URN: urn:nbn:se:kth:diva-159398DOI: 10.1002/2014JA020285ISI: 000346792100021OAI: oai:DiVA.org:kth-159398DiVA, id: diva2:784598
Forskningsfinansiär
Rymdstyrelsen, 78/11AB
Anmärkning

QC 20150130

Tillgänglig från: 2015-01-30 Skapad: 2015-01-29 Senast uppdaterad: 2019-06-18Bibliografiskt granskad

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Karlsson, TomasVaivads, Andris

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Journal of Geophysical Research - Space Physics
Astronomi, astrofysik och kosmologi

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