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Event study combining magnetospheric and ionospheric perspectives of the substorm current wedge modeling

Event study combining magnetospheric and ionospheric perspectives of the substorm current wedge modeling
Event study combining magnetospheric and ionospheric perspectives of the substorm current wedge modeling

Unprecedented spacecraft and instrumental coverage and the isolated nature and distinct step-like development of a substorm on 17 March 2010 has allowed validation of the two-loop substorm current wedge model (SCW2L). We find a close spatiotemporal relationship of the SCW with many other essential signatures of substorm activity in the magnetotail and demonstrate its azimuthally localized structure and stepwise expansion in the magnetotail. We confirm that ground SCW diagnostics makes it possible to reconstruct and organize the azimuthal spatiotemporal substorm development pattern with accuracy better than 1 h magnetic local time (MLT) in the case of medium-scale substorm. The Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE)-based study of global field-aligned current distribution indicates that (a) the SCW-related field-aligned current system consists of simultaneously activated R1- and R2-type currents, (b) their net currents have a R1-sense, and (c) locations of net current peaks are consistent with the SCW edge locations inferred from midlatitude variations. Thanks to good azimuthal coverage of four GOES and three Time History of Events and Macroscale Interactions during Substorms spacecraft, we evaluated the intensities of the SCW R1- and R2-like current loops (using the SCW2L model) obtained from combined magnetospheric and ground midlatitude magnetic observations and found the net currents consistent (within a factor of 2) with the AMPERE-based estimate. We also ran an adaptive magnetospheric model and show that SCW2L model outperforms it in predicting the magnetic configuration changes during substorm dipolarizations.

current system, dipolarization, magnetosphere, modeling, plasma injection, substorm
2169-9380
9714-9728
Sergeev, V. A.
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Nikolaev, A. V.
4d9ff5ec-4686-415d-bb1c-a36f3ceac696
Kubyshkina, M. V.
7b462eab-aab7-4745-b9ea-c85dbf93446f
Tsyganenko, N. A.
8746985b-0e39-49e4-a896-ae749e1fdb23
Singer, H. J.
f56d6367-71ed-4c8e-8d6c-53ba05394770
Rodriguez, J. V.
37b4fabc-8a25-401a-aee8-8a6924b85b21
Angelopoulos, V.
a55b4dce-28b1-40de-8ea9-70b32aeb17e8
Nakamura, R.
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Milan, S. E.
b6dd5367-b0c4-4f30-953a-f2d13078d656
Coxon, J. C.
566baea5-6a30-4855-bde3-a09c115efde4
Anderson, B. J.
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Korth, H.
47ef62e1-890c-46c6-8d1f-b715ba2b1cca
Sergeev, V. A.
d7ce5103-cddb-4de3-a2d3-f14ffb9a3fd8
Nikolaev, A. V.
4d9ff5ec-4686-415d-bb1c-a36f3ceac696
Kubyshkina, M. V.
7b462eab-aab7-4745-b9ea-c85dbf93446f
Tsyganenko, N. A.
8746985b-0e39-49e4-a896-ae749e1fdb23
Singer, H. J.
f56d6367-71ed-4c8e-8d6c-53ba05394770
Rodriguez, J. V.
37b4fabc-8a25-401a-aee8-8a6924b85b21
Angelopoulos, V.
a55b4dce-28b1-40de-8ea9-70b32aeb17e8
Nakamura, R.
32e21fb4-3867-4da1-8d1a-657b26a11bae
Milan, S. E.
b6dd5367-b0c4-4f30-953a-f2d13078d656
Coxon, J. C.
566baea5-6a30-4855-bde3-a09c115efde4
Anderson, B. J.
18c481f1-c4c7-4a45-9eb4-1e093b8d8390
Korth, H.
47ef62e1-890c-46c6-8d1f-b715ba2b1cca

Sergeev, V. A., Nikolaev, A. V., Kubyshkina, M. V., Tsyganenko, N. A., Singer, H. J., Rodriguez, J. V., Angelopoulos, V., Nakamura, R., Milan, S. E., Coxon, J. C., Anderson, B. J. and Korth, H. (2019) Event study combining magnetospheric and ionospheric perspectives of the substorm current wedge modeling. Journal of Geophysical Research: Space Physics, 119 (12), 9714-9728. (doi:10.1002/2014JA020522).

Record type: Article

Abstract

Unprecedented spacecraft and instrumental coverage and the isolated nature and distinct step-like development of a substorm on 17 March 2010 has allowed validation of the two-loop substorm current wedge model (SCW2L). We find a close spatiotemporal relationship of the SCW with many other essential signatures of substorm activity in the magnetotail and demonstrate its azimuthally localized structure and stepwise expansion in the magnetotail. We confirm that ground SCW diagnostics makes it possible to reconstruct and organize the azimuthal spatiotemporal substorm development pattern with accuracy better than 1 h magnetic local time (MLT) in the case of medium-scale substorm. The Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE)-based study of global field-aligned current distribution indicates that (a) the SCW-related field-aligned current system consists of simultaneously activated R1- and R2-type currents, (b) their net currents have a R1-sense, and (c) locations of net current peaks are consistent with the SCW edge locations inferred from midlatitude variations. Thanks to good azimuthal coverage of four GOES and three Time History of Events and Macroscale Interactions during Substorms spacecraft, we evaluated the intensities of the SCW R1- and R2-like current loops (using the SCW2L model) obtained from combined magnetospheric and ground midlatitude magnetic observations and found the net currents consistent (within a factor of 2) with the AMPERE-based estimate. We also ran an adaptive magnetospheric model and show that SCW2L model outperforms it in predicting the magnetic configuration changes during substorm dipolarizations.

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More information

Accepted/In Press date: 8 November 2014
e-pub ahead of print date: 13 November 2014
Published date: December 2019
Keywords: current system, dipolarization, magnetosphere, modeling, plasma injection, substorm

Identifiers

Local EPrints ID: 430691
URI: https://eprints.soton.ac.uk/id/eprint/430691
ISSN: 2169-9380
PURE UUID: 5d9e7ace-8063-41bb-9c16-734d9eb72d21
ORCID for J. C. Coxon: ORCID iD orcid.org/0000-0002-0166-6854

Catalogue record

Date deposited: 08 May 2019 16:30
Last modified: 03 Dec 2019 01:34

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Contributors

Author: V. A. Sergeev
Author: A. V. Nikolaev
Author: M. V. Kubyshkina
Author: N. A. Tsyganenko
Author: H. J. Singer
Author: J. V. Rodriguez
Author: V. Angelopoulos
Author: R. Nakamura
Author: S. E. Milan
Author: J. C. Coxon ORCID iD
Author: B. J. Anderson
Author: H. Korth

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