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Whistler mode waves at magnetotail dipolarization fronts

Abstract : 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 (Bx ∼ 0) and in association with anisotropic electron distributions (Tperp>T∥). 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.
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Submitted on : Monday, October 11, 2021 - 4:51:37 PM
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H. Viberg, Y. V. Khotyaintsev, A. Vaivads, M. André, H.S. Fu, et al.. Whistler mode waves at magnetotail dipolarization fronts. Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2014, 119, pp.2605-2611. ⟨10.1002/2014JA019892⟩. ⟨hal-01552032⟩

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