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- Title
MMS Observations of Multiscale Hall Physics in the Magnetotail.
- Authors
Alm, Love; André, Mats; Graham, Daniel B.; Khotyaintsev, Yuri V.; Vaivads, Andris; Chappell, Charles. R.; Dargent, Jérémy; Fuselier, Stephen A.; Haaland, Stein; Lavraud, Benoit; Li, Wenya; Tenfjord, Paul; Toledo‐Redondo, Sergio; Vines, Sarah K.
- Abstract
We present Magnetospheric Multiscale mission (MMS) observations of Hall physics in the magnetotail, which compared to dayside Hall physics is a relatively unexplored topic. The plasma consists of electrons, moderately cold ions (T∼1.5 keV) and hot ions (T∼20 keV). MMS can differentiate between the cold ion demagnetization region and hot ion demagnetization regions, which suggests that MMS was observing multiscale Hall physics. The observed Hall electric field is compared with a generalized Ohm's law, accounting for multiple ion populations. The cold ion population, despite its relatively high initial temperature, has a significant impact on the Hall electric field. These results show that multiscale Hall physics is relevant over a much larger temperature range than previously observed and is relevant for the whole magnetosphere as well as for other astrophysical plasma. Key Points: MMS multispacecraft observation of Hall electric fields during a deep partial plasma sheet crossingMixing of hot (20 keV) and moderately cold (1.5 keV) ions generate multiscale Hall electric fieldsElectron and cold/hot ion demagnetization boundaries are observed near their predicted locations
- Subjects
DEMAGNETIZATION; OHM'S law; PHYSICS; PLASMA astrophysics; ELECTRIC fields
- Publication
Geophysical Research Letters, 2019, Vol 46, Issue 17/18, p10230
- ISSN
0094-8276
- Publication type
Article
- DOI
10.1029/2019GL084137