Subauroral and Polar Traveling Ionospheric Disturbances During the 7–9 September 2017 Storms
Name
2019SW002325.pdf
Description
Published version
Size
70.39 MB
Format
Adobe PDF
Checksum (MD5)
d1dc34440c9b718cb3ebb93933a376b7
Author(s)
Zhang, Shun-Rong
Erickson, Philip J
Coster, Anthea J
Rideout, William
Vierinen, Juha
Jonah, Olusegun
Goncharenko, Larisa P
Date Issued
2019
Journal
Space Weather
Publisher
American Geophysical Union (AGU)
Citation
Zhang, Shun-Rong, Erickson, Philip J, Coster, Anthea J, Rideout, William, Vierinen, Juha et al. 2019. "Subauroral and Polar Traveling Ionospheric Disturbances During the 7–9 September 2017 Storms." Space Weather, 17 (12).
Version
Final published version
Abstract
©2019. The Authors. This study provides new scenarios for storm time traveling ionospheric disturbance excitation and subsequent propagation at subauroral and polar latitudes. We used ground-based total electron content observations from Global Navigation Satellite System receivers combined with wide field, subauroral ionospheric plasma parameters measured with the Millstone Hill Incoherent Scatter Radar during strong September 2017 geospace storms. Observations provide the first evidence of significant influences on traveling ionospheric disturbance (TID) propagation and excitation caused by the presence of large subauroral polarization stream flow channels. Simultaneous large- and medium-scale TIDs evolved during the event in a broad subauroral and midlatitude area near dusk. Similar concurrent TIDs occurred near dawn sectors as well during a period of sustained southward Bz. Medium-scale TIDs at subauroral and midlatitudes had wave fronts aligned northwest-southeast near dusk, and northeast-southwest near dawn. These wave fronts were highly correlated with the direction of storm time large zonal plasma drift enhancements at these latitudes. At high latitudes, unexpected, predominant, and persistent storm time TIDs were identified with 2000+ km zonal wave fronts and 15% total electron content perturbation amplitudes, moving in transpolar propagation pathways from the dayside into the nightside. This propagation direction in the polar region was opposite to the normal assumption that TIDs originated in the nightside auroral region. Results suggest that significant dayside sources, such as cusp regions, can be efficient in generating transpolar TIDs during geospace storm intervals.
MIT Department
Haystack Observatory
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1029/2019SW002325
