MMS, Van Allen Probes, GOES 13, and Ground‐Based Magnetometer Observations of EMIC Wave Events Before, During, and After a Modest Interplanetary Shock

M. J Engebretson; J. L Posch; N. S. S Capman; N. G Campuzano; P Bělik; R. C Allen; S. K Vines; B. J Anderson; S Tian; C. A Cattell; J. R Wygant; S. A Fuselier; M. R Argall; M. R Lessard; R. B Torbert; M. B Moldwin; M. D Hartinger; H Kim; C. T Russell; C. A Kletzing; G. D Reeves; H. J Singer

doi:10.1029/2018JA025984

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MMS, Van Allen Probes, GOES 13, and Ground‐Based Magnetometer Observations of EMIC Wave Events Before, During, and After a Modest Interplanetary Shock

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MMS, Van Allen Probes, GOES 13, and Ground‐Based Magnetometer Observations of EMIC Wave Events Before, During, and After a Modest Interplanetary Shock

M. J Engebretson, J. L Posch, N. S. S Capman, N. G Campuzano, P Bělik, R. C Allen, S. K Vines, B. J Anderson, S Tian, C. A Cattell, …

Journal of geophysical research. Space physics, Vol.123(10), pp.8331-8357

10/2018

DOI: 10.1029/2018JA025984

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Abstract

The stimulation of electromagnetic ion cyclotron (EMIC) waves by a magnetospheric compression is perhaps the closest thing to a controlled experiment that is currently possible in magnetospheric physics, in that one prominent factor that can increase wave growth acts at a well-defined time. We present a detailed analysis of EMIC waves observed in the outer dayside magnetosphere by the four Magnetosphere Multiscale (MMS) spacecraft, Van Allen Probe A, and GOES 13 and by four very high latitude ground magnetometer stations in the western hemisphere before, during, and after a modest interplanetary shock on 14 December 2015. Analysis shows several features consistent with current theory, as well as some unexpected features. During the most intense MMS wave burst, which began ~ 1 min after the end of a brief magnetosheath incursion, independent transverse EMIC waves with orthogonal linear polarizations appeared simultaneously at all four spacecraft. He++ band EMIC waves were observed by MMS inside the magnetosphere, whereas almost all previous studies of He++ band EMIC waves observed them only in the magnetosheath and magnetopause boundary layers. Transverse EMIC waves also appeared at Van Allen Probe A and GOES 13 very near the times when the magnetic field compression reached their locations, indicating that the compression lowered the instability threshold to allow for EMIC wave generation throughout the outer dayside magnetosphere. The timing of the EMIC waves at both MMS and Van Allen Probe A was consistent with theoretical expectations for EMIC instabilities based on characteristics of the proton distributions observed by instruments on these spacecraft.

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Title: Subtitle: MMS, Van Allen Probes, GOES 13, and Ground‐Based Magnetometer Observations of EMIC Wave Events Before, During, and After a Modest Interplanetary Shock
Creators: M. J Engebretson - Augsburg University
J. L Posch - Augsburg University
N. S. S Capman - Augsburg University
N. G Campuzano - Augsburg University
P Bělik - Augsburg University
R. C Allen - Johns Hopkins University
S. K Vines - Johns Hopkins University
B. J Anderson - Johns Hopkins University
S Tian - University of Minnesota
C. A Cattell - University of Minnesota
J. R Wygant - University of Minnesota
S. A Fuselier - Southwest Research Institute
M. R Argall - University of New Hampshire
M. R Lessard - University of New Hampshire
R. B Torbert - University of New Hampshire
M. B Moldwin - University of Michigan
M. D Hartinger - Virginia Tech
H Kim - New Jersey Institute of Technology
C. T Russell - University of California, Los Angeles
C. A Kletzing - University of Iowa
G. D Reeves - Los Alamos National Laboratory
H. J Singer - National Oceanic and Atmospheric Administration
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.123(10), pp.8331-8357
DOI: 10.1029/2018JA025984
ISSN: 2169-9380
eISSN: 2169-9402
Grant note: DOI: 10.13039/100000104, name: National Aeronautics and Space Administration, award: NAS5‐01072, NNG04EB99C; DOI: 10.13039/100000001, name: National Science Foundation, award: OPP‐1643700, AGS‐1602560, AGS‐1547252, PLR‐1543364, AGS‐1654044, PLR‐1341677, PLR‐1341493, AGS‐1651263
Language: English
Date published: 10/2018
Academic Unit: Physics and Astronomy
Record Identifier: 9984199856502771

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