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Journal Article

MMS Observations of Multiscale Hall Physics in the Magnetotail

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Haaland,  Stein
Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Alm, L., André, M., Graham, D. B., Khotyaintsev, Y. V., Vaivads, A., Chappell, C. R., et al. (2019). MMS Observations of Multiscale Hall Physics in the Magnetotail. Geophysical Research Letters, 46(17-18), 10230-10239. doi:10.1029/2019GL084137.


Cite as: https://hdl.handle.net/21.11116/0000-0006-6819-A
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.