the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Thermal electron anisotropy driven by kinetic Alfven waves in the Earth's magnetotail
Abstract. Thermal and subthermal electron populations in the Earth's magnetotail are usually characterized by pronounced field-aligned anisotropy that contributes to generation of strong electric currents within the magnetotail current sheet. Formation of this anisotropy requires electron field-aligned acceleration, and thus likely involves field-aligned electric fields. Such fields can be carried by various electromagnetic waves generated by fast plasma flows interacting with ambient magnetotail plasma. In this paper we consider one of the most intense observed wave emissions, kinetic Alfven waves, that often accompany fast plasma flows in the magnetotail. Using two tail seasons (2017, 2018) of MMS observations we have collected statistics of 80 fast plasma flows (or bursty bulk flows) events with distinctive enhancement of intensity of broadband electromagnetic waves (kinetic Alfven waves). We show correlation the intensity of electric fields of kinetic Alfven waves and characteristics of electron anisotropy distributions: the parallel electron anisotropy increases with magnitude of the wave parallel electric field. Also the energy range of this electron anisotropic population is well within the expected acceleration range for assumed kinetic Alfven waves. Our results indicate an important role of KAWs in production of thermal field-aligned electron population typically observed in the Earth's magnetotail.
- Preprint
(6110 KB) - Metadata XML
- BibTeX
- EndNote
-
RC1: 'Review for angeo-2020-76', Anonymous Referee #1, 08 Jan 2021
- AC2: 'Reply on RC1', Alexander Lukin, 01 Mar 2021
-
RC2: 'Thermal electron anisotropy driven by kinetic Alfven waves in the Earth's magnetotail', Anonymous Referee #2, 12 Jan 2021
- AC1: 'Reply on RC2', Alexander Lukin, 01 Mar 2021
-
RC1: 'Review for angeo-2020-76', Anonymous Referee #1, 08 Jan 2021
- AC2: 'Reply on RC1', Alexander Lukin, 01 Mar 2021
-
RC2: 'Thermal electron anisotropy driven by kinetic Alfven waves in the Earth's magnetotail', Anonymous Referee #2, 12 Jan 2021
- AC1: 'Reply on RC2', Alexander Lukin, 01 Mar 2021
Viewed
HTML | XML | Total | BibTeX | EndNote | |
---|---|---|---|---|---|
752 | 191 | 56 | 999 | 55 | 56 |
- HTML: 752
- PDF: 191
- XML: 56
- Total: 999
- BibTeX: 55
- EndNote: 56
Viewed (geographical distribution)
Country | # | Views | % |
---|
Total: | 0 |
HTML: | 0 |
PDF: | 0 |
XML: | 0 |
- 1