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Magnetic forces associated with bursty bulk flows in Earth's magnetotail
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
Vise andre og tillknytning
2015 (engelsk)Inngår i: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, nr 9, s. 3122-3128Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We present the first direct measurements of magnetic forces acting on bursty bulk flow plasma in the magnetotail. The magnetic forces are determined using Cluster multispacecraft measurements. We analyze 67 bursty bulk flow (BBF) events and show that the curvature part of the magnetic force is consistently positive, acting to accelerate the plasma toward Earth between approximately 10 and 20 R-E geocentrical distances, while the magnetic field pressure gradient increasingly brakes the plasma as it moves toward Earth. The net result is that the magnetic force accelerates the plasma at distances greater than approximately 14 R-E, while it acts to decelerate it within that distance. The magnetic force, together with the thermal pressure gradient force, will determine the dynamics of the BBFs as they propagate toward the near-Earth tail region. The determination of the former provides an important clue to the ultimate fate of BBFs in the inner magnetosphere.

sted, utgiver, år, opplag, sider
2015. Vol. 42, nr 9, s. 3122-3128
Emneord [en]
bursty bulk flows, multipoint measurements, Cluster, curlometer
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-106026DOI: 10.1002/2015GL063999ISI: 000355878300008OAI: oai:DiVA.org:umu-106026DiVA, id: diva2:839949
Tilgjengelig fra: 2015-07-06 Laget: 2015-07-03 Sist oppdatert: 2018-06-07bibliografisk kontrollert

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Hamrin, MariaPitkänen, Timo

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