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Directed network of substorms using SuperMAG ground‐based magnetometer data
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Orr, Lois, Chapman, Sandra C. and Gjerloev, J. W. (2019) Directed network of substorms using SuperMAG ground‐based magnetometer data. Geophysical Research Letters . doi:10.1029/2019gl082824 ISSN 1944-8007.
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WRAP-directed-network-substorms-SuperMAG-magnetometer-Chapman-2019.pdf - Accepted Version - Requires a PDF viewer. Download (2546Kb) | Preview |
Official URL: https://doi.org/10.1029/2019GL082824
Abstract
We quantify the spatio‐temporal evolution of the substorm ionospheric current system utilizing the SuperMAG 100+ magnetometers. We construct dynamical directed networks from this data for the first time. If the canonical cross‐correlation (CCC) between vector magnetic field perturbations observed at two magnetometer stations exceeds a threshold, they form a network connection. The time lag at which CCC is maximal determines the direction of propagation or expansion of the structure captured by the network connection. If spatial correlation reflects ionospheric current patterns, network properties can test different models for the evolving substorm current system. We select 86 isolated substorms based on nightside ground station coverage. We find, and obtain the timings for, a consistent picture in which the classic substorm current wedge (SCW) forms. A current system is seen pre‐midnight following the SCW westward expansion. Later, there is a weaker signal of eastward expansion. Finally, there is evidence of substorm‐enhanced convection.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | Q Science > QC Physics | ||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
| SWORD Depositor: | Library Publications Router | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Auroral substorms, Magnetospheric substorms, Ionospheric critical frequencies | ||||||||||||
| Journal or Publication Title: | Geophysical Research Letters | ||||||||||||
| Publisher: | American Geophysical Union (AGU) | ||||||||||||
| ISSN: | 1944-8007 | ||||||||||||
| Official Date: | 10 June 2019 | ||||||||||||
| Dates: |
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| DOI: | 10.1029/2019gl082824 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Reuse Statement (publisher, data, author rights): | "This is the peer reviewed version of the following article: Orr, L., Chapman, S. C., and Gjerloev, J. W.. ( 2019), Directed network of substorms using SuperMAG ground‐based magnetometer data. Geophys. Res. Lett., 46., which has been published in final form at https://doi.org/10.1029/2019GL082824. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions." | ||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
| Date of first compliant deposit: | 21 June 2019 | ||||||||||||
| Date of first compliant Open Access: | 27 June 2019 | ||||||||||||
| RIOXX Funder/Project Grant: |
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