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Magnetic forces associated with bursty bulk flows in Earth's magnetotail
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0003-1270-1616
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0002-0349-0645
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2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, no 9, 3122-3128 p.Article in journal (Refereed) 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 RE 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 RE, 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. Key Points Direct measurements of magnetic force acting on BBF plasma BBF plasma is accelerated toward Earth until it reaches 15 RE, then braked Knowledge of the forces on BBFs provides clue to their fate close to Earth.

Place, publisher, year, edition, pages
2015. Vol. 42, no 9, 3122-3128 p.
Keyword [en]
bursty bulk flows, Cluster, curlometer, multipoint measurements
National Category
Geophysics
Identifiers
URN: urn:nbn:se:kth:diva-170293DOI: 10.1002/2015GL063999ISI: 000355878300008Scopus ID: 2-s2.0-84930477445OAI: oai:DiVA.org:kth-170293DiVA: diva2:830590
Funder
Swedish National Space Board, 78/11A-B
Note

QC 20150630

Available from: 2015-06-30 Created: 2015-06-29 Last updated: 2017-12-04Bibliographically approved

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Karlsson, TomasKullen, Anita

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