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Whistler mode waves atmagnetotail dipolarization fronts
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
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2014 (English)In: J GEOPHYS RES-SPACE, ISSN 2169-9380, Vol. 119, no 4, 2605-2611 p.Article in journal (Refereed) Published
Abstract [en]

We report the statistics of whistler mode waves observed in relation to dipolarization fronts (DFs) in Earth's magnetotail using data from the four Cluster spacecraft spanning a period of 9 years, 2001-2009. We show that whistler mode waves are common in a vicinity of DFs: between 30 and 60% of all DFs are associated with whistlers. Whistlers are about 7 times more likely to be observed near a DF than at any random location in the magnetotail. Therefore, whistlers are a characteristic signature of DFs. We find that whistlers are most often detected in the flux pileup region (FPR) following the DF, close to the center of the current sheet (B-x approximate to 0) and in association with anisotropic electron distributions (T>T-vertical bar). This suggests that we typically observe emissions in the source region where they are generated by the anisotropic electrons produced by the betatron process inside the FPR.

Place, publisher, year, edition, pages
2014. Vol. 119, no 4, 2605-2611 p.
Keyword [en]
whistler waves, dipolarization fronts, statistics, magnetic reconnection, wave-particle interactions
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-227898DOI: 10.1002/2014JA019892ISI: 000336218600018OAI: oai:DiVA.org:uu-227898DiVA: diva2:731724
Available from: 2014-07-02 Created: 2014-07-01 Last updated: 2014-11-12Bibliographically approved

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Viberg, HenrikVaivads, A.

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