Change search
ReferencesLink to record
Permanent link

Direct link
Dipolarization fronts as a consequence of transient reconnection: in situ evidence
Show others and affiliations
2013 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 40, no 23, 6023-6027 p.Article in journal (Refereed) Published
Abstract [en]

Dipolarization fronts (DFs) are frequently detected in the Earth's magnetotail from X-GSM=-30 R-E to X-GSM=-7 R-E. How these DFs are formed is still poorly understood. Three possible mechanisms have been suggested in previous simulations: (1) jet braking, (2) transient reconnection, and (3) spontaneous formation. Among these three mechanisms, the first has been verified by using spacecraft observation, while the second and third have not. In this study, we show Cluster observation of DFs inside reconnection diffusion region. This observation provides in situ evidence of the second mechanism: Transient reconnection can produce DFs. We suggest that the DFs detected in the near-Earth region (X-GSM>-10 R-E) are primarily attributed to jet braking, while the DFs detected in the mid- or far-tail region (X-GSM<-15 R-E) are primarily attributed to transient reconnection or spontaneous formation. In the jet-braking mechanism, the high-speed flow pushes the preexisting plasmas to produce the DF so that there is causality between high-speed flow and DF. In the transient-reconnection mechanism, there is no causality between high-speed flow and DF, because the frozen-in condition is violated.

Place, publisher, year, edition, pages
American Geophysical Union , 2013. Vol. 40, no 23, 6023-6027 p.
Keyword [en]
dipolarization front, unsteady reconnection, ion diffusion region, high-speed flow, jet braking, spontaneous formation
National Category
URN: urn:nbn:se:umu:diva-85795DOI: 10.1002/2013GL058620ISI: 000329141900002OAI: diva2:695923
Available from: 2014-02-12 Created: 2014-02-10 Last updated: 2014-03-04Bibliographically approved

Open Access in DiVA

fulltext(2185 kB)82 downloads
File information
File name FULLTEXT01.pdfFile size 2185 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Hamrin, Maria
By organisation
Department of Physics
In the same journal
Geophysical Research Letters

Search outside of DiVA

GoogleGoogle Scholar
Total: 82 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 46 hits
ReferencesLink to record
Permanent link

Direct link