Journal article
Lower Hybrid Drift Waves and Electromagnetic Electron Space‐Phase Holes Associated With Dipolarization Fronts and Field‐Aligned Currents Observed by the Magnetospheric Multiscale Mission During a Substorm
Journal of geophysical research. Space physics, Vol.122(12), pp.12,236-12,257
12/2017
DOI: 10.1002/2017JA024550
Abstract
We analyze two ion scale dipolarization fronts associated with field‐aligned currents detected by the Magnetospheric Multiscale mission during a large substorm on 10 August 2016. The first event corresponds to a fast dawnward flow with an antiparallel current and could be generated by the wake of a previous fast earthward flow. It is associated with intense lower hybrid drift waves detected at the front and propagating dawnward with a perpendicular phase speed close to the electric drift and the ion thermal velocity. The second event corresponds to a flow reversal: from southwward/dawnward to northward/duskward associated with a parallel current consistent with a brief expansion of the plasma sheet before the front crossing and with a smaller lower hybrid drift wave activity. Electromagnetic electron phase‐space holes are detected near these low‐frequency drift waves during both events. The drift waves could accelerate electrons parallel to the magnetic field and produce the parallel electron drift needed to generate the electron holes. Yet we cannot rule out the possibility that the drift waves are produced by the antiparallel current associated with the fast flows, leaving the source for the electron holes unexplained.
Key Points
Dipolarization fronts associated with field‐aligned currents are observed at the plasma sheet edge with a few ion inertial length scale
Intense lower hybrid drift waves are detected at the front and can accelerate electrons parallel to B
Electromagnetic electron phase‐space holes are detected near the lower hybrid drift waves and could be a latter by‐product of these
Details
- Title: Subtitle
- Lower Hybrid Drift Waves and Electromagnetic Electron Space‐Phase Holes Associated With Dipolarization Fronts and Field‐Aligned Currents Observed by the Magnetospheric Multiscale Mission During a Substorm
- Creators
- O Le Contel - Laboratoire de Physique des PlasmasB. J Anderson - Johns Hopkins UniversityA. N Jaynes - University of Colorado BoulderR Nakamura - Austrian Academy of SciencesH Breuillard - University of Paris-SudM. R Argall - University of New HampshireD. B Graham - Swedish Institute of Space PhysicsD Fischer - Austrian Academy of SciencesA Retinò - University of Paris-SudM Berthomier - University of Paris-SudR Pottelette - University of Paris-SudL Mirioni - University of Paris-SudT Chust - University of Paris-SudF. D Wilder - University of Colorado BoulderD. J Gershman - Goddard Space Flight CenterA Varsani - Austrian Academy of SciencesP.‐A Lindqvist - KTH Royal Institute of TechnologyYu. V Khotyaintsev - Swedish Institute of Space PhysicsC Norgren - Swedish Institute of Space PhysicsK. A Goodrich - University of Colorado BoulderR. E Ergun - University of Colorado BoulderJ. L Burch - Southwest Research InstituteR. B Torbert - University of New HampshireJ Needell - University of New HampshireM Chutter - University of New HampshireD Rau - University of New HampshireI Dors - University of New HampshireC. T Russell - University of California, Los AngelesW Magnes - Austrian Academy of SciencesR. J Strangeway - University of California, Los AngelesK. R Bromund - Goddard Space Flight CenterH. Y Wei - University of California, Los AngelesF Plaschke - Austrian Academy of SciencesG Le - Goddard Space Flight CenterT. E Moore - Goddard Space Flight CenterB. L Giles - Goddard Space Flight CenterW. R Paterson - Goddard Space Flight CenterC. J Pollock - Goddard Space Flight CenterJ. C Dorelli - Goddard Space Flight CenterL. A Avanov - Goddard Space Flight CenterY Saito - Institute for Space and Astronautical Science Sagamihara JapanB Lavraud - Université Toulouse III - Paul SabatierS. A Fuselier - Southwest Research InstituteB. H Mauk - Johns Hopkins UniversityI. J Cohen - Johns Hopkins UniversityD. L Turner - The Aerospace CorporationJ. F Fennell - The Aerospace CorporationT Leonard - University of Colorado Boulder
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.122(12), pp.12,236-12,257
- DOI
- 10.1002/2017JA024550
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 22
- Grant note
- CNES
- Language
- English
- Date published
- 12/2017
- Academic Unit
- Physics and Astronomy; University College Courses
- Record Identifier
- 9984199763202771
Metrics
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