Two Classes of Equatorial Magnetotail Dipolarization Fronts Observed by Magnetospheric Multiscale Mission: A Statistical Overview

被引：2

作者：

Alqeeq, S. W. ^{[1
]}

Le Contel, O. ^{[1
]}

Canu, P. ^{[1
]}

Retino, A. ^{[1
]}

Chust, T. ^{[1
]}

Mirioni, L. ^{[1
]}

Chuvatin, A. ^{[1
]}

Nakamura, R. ^{[2
]}

Ahmadi, N. ^{[3
]}

Wilder, F. D. ^{[4
]}

Gershman, D. J. ^{[5
]}

Khotyaintsev, Yu. V. ^{[6
]}

Lindqvist, P. -A. ^{[7
]}

Ergun, R. E. ^{[3
]}

Burch, J. L. ^{[8
,9
]}

Torbert, R. B. ^{[10
,11
]}

Fuselier, S. A. ^{[8
,9
]}

Russell, C. T. ^{[12
]}

Wei, H. Y. ^{[12
]}

Strangeway, R. J. ^{[12
]}

Bromund, K. R. ^{[5
]}

Fischer, D. ^{[2
]}

Giles, B. L. ^{[5
]}

Saito, Y. ^{[13
]}

机构：

[1] Univ Paris Saclay, Inst Polytech Paris, UMR7648, Lab Phys Plasmas LPP,CNRS,Sorbonne Univ,Observ Par, Paris, France

[2] Austrian Acad Sci, Space Res Inst, Graz, Austria

[3] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO USA

[4] Univ Texas Arlington, Dept Phys, Arlington, TX USA

[5] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

[6] Swedish Inst Space Phys, Uppsala, Sweden

[7] Royal Inst Technol, Stockholm, Sweden

[8] Southwest Res Inst, San Antonio, TX USA

[9] Univ Texas San Antonio, San Antonio, TX USA

[10] Univ New Hampshire, Space Sci Ctr, Durham, NH USA

[11] Univ New Hampshire, Dept Phys, Durham, NH USA

[12] Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA

[13] Inst Space & Astronaut Sci, Sagamihara, Japan

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2023年 / 128卷 / 10期

关键词：

dipolarization fronts; energy conversion; Earth's magnetotail; Earth's magnetosphere; plasma transport; ELECTROMAGNETIC ENERGY-CONVERSION; ELECTRIC-FIELD; RECONNECTION; DISSIPATION; DYNAMICS; FLOWS; DIPS;

D O I：

10.1029/2023JA031738

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We carried out a statistical study of equatorial dipolarization fronts (DFs) detected by the Magnetospheric Multiscale mission during the full 2017 Earth's magnetotail season. We found that two DF classes are distinguished: class I (74.4%) corresponds to the standard DF properties and energy dissipation and a new class II (25.6%). This new class includes the six DF discussed in Alqeeq et al. (2022, ) and corresponds to a bump of the magnetic field associated with a minimum in the ion and electron pressures and a reversal of the energy conversion process. The possible origin of this second class is discussed. Both DF classes show that the energy conversion process in the spacecraft frame is driven by the diamagnetic current dominated by the ion pressure gradient. In the fluid frame, it is driven by the electron pressure gradient. In addition, we have shown that the energy conversion processes are not homogeneous at the electron scale mostly due to the variations of the electric fields for both DF classes.

引用

页数：20

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