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Global dynamical network of the spatially correlated Pc2 wave response for the 2015 St. Patrick's Day storm
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Chaudhry, S., Chapman, Sandra C., Gjerloev, J. and Beggan, C. D. (2023) Global dynamical network of the spatially correlated Pc2 wave response for the 2015 St. Patrick's Day storm. Journal of Geophysical Research: Space Physics, 128 (5). e2022JA031175. doi:10.1029/2022ja031175 ISSN 2169-9380.
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Official URL: https://doi.org/10.1029/2022ja031175
Abstract
We show the global dynamics of spatial correlation of Pc2 wave activity can track the evolution of the 2015 St. Patrick's Day geomagnetic storm for an 8 hr time window around onset. The global spatially coherent response is tracked by forming a dynamical network from 1 s data using the full set of 100+ ground‐based magnetometer stations collated by SuperMAG and Intermagnet. The pattern of spatial coherence is captured by network parameters which in turn track the evolution of the storm. At onset interplanetary magnetic field (IMF) B z > 0 and Pc2 power increases, we find a global response with stations correlated over both local and global distances. Following onset, whilst B z > 0, the network response is confined to the day‐side. When IMF B z < 0, there is a strong local response at high latitudes, consistent with the onset of polar cap convection driven by day‐side reconnection. The spatially coherent response as revealed by the network grows and is maximal when auroral (SuperMAG electrojet) and ring current (SuperMAG ring current) 1 min resolution geomagnetic indices peak, consistent with an active electrojet and ring‐current. Throughout the storm there is a coherent response both in stations located along lines of constant geomagnetic longitude, between hemispheres, and across magnetic local time. The network does not simply track average Pc2 wave power, it is characterized by network parameters which track the storm evolution. This is the first study to parameterize global Pc2 wave correlation and offers the possibility of statistical studies across multiple events and comparison with, and validation of, space weather models.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
SWORD Depositor: | Library Publications Router | |||||||||
Library of Congress Subject Headings (LCSH): | Space environment, Geomagnetism, Magnetosphere, Astrophysics, Magnetic storms, Geophysics | |||||||||
Journal or Publication Title: | Journal of Geophysical Research: Space Physics | |||||||||
Publisher: | Wiley-Blackwell Publishing, Inc. | |||||||||
ISSN: | 2169-9380 | |||||||||
Official Date: | 4 May 2023 | |||||||||
Dates: |
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Volume: | 128 | |||||||||
Number: | 5 | |||||||||
Article Number: | e2022JA031175 | |||||||||
DOI: | 10.1029/2022ja031175 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||
Date of first compliant deposit: | 25 July 2023 | |||||||||
Date of first compliant Open Access: | 25 July 2023 | |||||||||
RIOXX Funder/Project Grant: |
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