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Evidence for the braking of flow bursts as they propagate toward the Earth
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 119, nr 11, s. 9004-9018Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2014. Vol. 119, nr 11, s. 9004-9018
Emneord [en]
bursty bulk flow, braking, energy conversion, dipolarization front, plasma sheet, flux pileup region
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-99391DOI: 10.1002/2014JA020285ISI: 000346792100021OAI: oai:DiVA.org:umu-99391DiVA, id: diva2:790301
Tilgjengelig fra: 2015-02-24 Laget: 2015-02-07 Sist oppdatert: 2018-06-07bibliografisk kontrollert

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