Ionospheric symmetry caused by geomagnetic declination over North America
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2013_Zhang.pdf
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Author(s)
Zhang, Shun-Rong
Chen, Ziwei
Coster, Anthea J.
Erickson, Philip J.
Foster, John C.
Date Issued
October 2013
Journal
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Citation
Zhang, Shun-Rong, Ziwei Chen, Anthea J. Coster, Philip J. Erickson, and John C. Foster. “Ionospheric Symmetry Caused by Geomagnetic Declination over North America.” Geophysical Research Letters 40, no. 20 (October 28, 2013): 5350–54. © 2013 American Geophysical Union
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Final published version
Abstract
We describe variations in total electron content (TEC) in the North American sector exhibiting pronounced longitudinal progression and symmetry with respect to zero magnetic declination. Patterns were uncovered by applying an empirical orthogonal function (EOF) decomposition procedure to a 12 year ground-based American longitude sector GPS TEC data set. The first EOF mode describes overall average TEC, while the strong influence of geomagnetic declination on the midlatitude ionosphere is found in the second EOF mode (or the second most significant component). We find a high degree of correlation between spatial variations in the second EOF mode and vertical drifts driven by thermospheric zonal winds, along with well-organized temporal variation. Results strongly suggest a causative mechanism involving varying declination with longitude along with varying zonal wind climatology with local time, season, and solar cycle. This study highlights the efficiency and key role played by the geomagnetic field effect in influencing mesoscale ionospheric structures over a broad midlatitude range.
MIT Department
Haystack Observatory
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1002/2013GL057933
