Determining EMIC Wave Vector Properties Through Multi-Point Measurements: The Wave Curl Analysis

被引：8

作者：

Vines, S. K. ^{[1
]}

Anderson, B. J. ^{[1
]}

Allen, R. C. ^{[1
]}

Denton, R. E. ^{[2
]}

Engebretson, M. J. ^{[3
]}

Johnson, J. R. ^{[4
]}

Toledo-Redondo, S. ^{[5
]}

Lee, J. H. ^{[6
]}

Turner, D. L. ^{[1
]}

Ergun, R. E. ^{[7
]}

Strangeway, R. J. ^{[8
]}

Russell, C. T. ^{[8
]}

Wei, H. ^{[8
]}

Torbert, R. B. ^{[9
,10
]}

Fuselier, S. A. ^{[10
,11
]}

Giles, B. L. ^{[12
]}

Burch, J. L. ^{[10
]}

机构：

[1] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 21218 USA

[2] Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA

[3] Augsburg Univ, Dept Phys, Minneapolis, MN USA

[4] Andrews Univ, Dept Engn, Berrien Springs, MI 49104 USA

[5] Univ Murcia, Dept Electromagnetism & Elect, Murcia, Spain

[6] Aerosp Corp, El Segundo, CA 90245 USA

[7] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA

[8] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA

[9] Univ New Hampshire, Space Sci Ctr, Durham, NH 03824 USA

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

[11] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA

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

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2021年 / 126卷 / 04期

关键词：

electromagnetic ion cyclotron waves; EMIC; observational technique; wave vector; 1-2 MAGNETIC PULSATIONS; ION-CYCLOTRON WAVES; VAN ALLEN PROBES; EQUATORIAL MAGNETOSPHERE; LOW-FREQUENCY; CLUSTER; PRECIPITATION; POLARIZATION; INSTABILITY; ANISOTROPY;

D O I：

10.1029/2020JA028922

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Electromagnetic ion cyclotron (EMIC) waves play important roles in particle loss processes in the magnetosphere. Determining the evolution of EMIC waves as they propagate and how this evolution affects wave-particle interactions requires accurate knowledge of the wave vector, k. We present a technique using the curl of the wave magnetic field to determine k observationally, enabled by the unique configuration and instrumentation of the Magnetospheric MultiScale (MMS) spacecraft. The wave curl analysis is demonstrated for synthetic arbitrary electromagnetic waves with varying properties typical of observed EMIC waves. The method is also applied to an EMIC wave interval observed by MMS on October 28, 2015. The derived wave properties and k from the wave curl analysis for the observed EMIC wave are compared with the Waves in Homogenous, Anisotropic, Multi-component Plasma (WHAMP) wave dispersion solution and with results from other single- and multi-spacecraft techniques. We find good agreement between k from the wave curl analysis, k determined from other observational techniques, and k determined from WHAMP. Additionally, the variation of k due to the time and frequency intervals used in the wave curl analysis is explored. This exploration demonstrates that the method is robust when applied to a wave containing at least 3-4 wave periods and over a rather wide frequency range encompassing the peak wave emission. These results provide confidence that we are able to directly determine the wave vector properties using this multi-spacecraft method implementation, enabling systematic studies of EMIC wave k properties with MMS.

引用

页数：21