Source Region and Propagation of Dayside Large‐Scale Traveling Ionospheric Disturbances
Name
Geophysical Research Letters - 2020 - Nishimura - Source Region and Propagation of Dayside Large‐Scale Traveling.pdf
Description
Published version
Size
6.71 MB
Format
Adobe PDF
Checksum (MD5)
25b3811b703172c43c8fd9140a771e44
Author(s)
Nishimura, Y
Zhang, SR
Lyons, LR
Deng, Y
Coster, AJ
Moen, JI
Clausen, LB
Bristow, WA
Nishitani, N
Date Issued
September 21, 2020
Journal
Geophysical Research Letters
Publisher
American Geophysical Union
Citation
Nishimura, Y., Zhang, S. R., Lyons, L. R., Deng, Y., Coster, A. J., Moen, J. I., et al. (2020). Source region and propagation of dayside large-scale traveling ionospheric disturbances. Geophysical Research Letters, 47, e2020GL089451.
Version
Final published version
Abstract
We examined the source region of dayside large‐scale traveling ionospheric disturbances (LSTIDs) and their relation to cusp energy input. Aurora and total electron content (TEC) observations show that LSTIDs propagate equatorward away from the cusp and demonstrate the cusp region as the source region. Enhanced energy input to the cusp initiated by interplanetary magnetic field (IMF) southward turning triggers the LSTIDs, and each LSTID oscillation is correlated with a TEC enhancement in the dayside oval with tens of minutes periodicity. Equatorward‐propagating LSTIDs are likely gravity waves caused by repetitive heating in the cusp. The cusp source can explain the high LSTID occurrence on the dayside during geomagnetically active times. Poleward‐propagating ΔTEC patterns in the polar cap propagate nearly at the convection speed. While they have similar ΔTEC signatures to gravity wave‐driven LSTIDs, they are suggested to be weak polar cap patches quasiperiodically drifting from the cusp into the polar cap via dayside reconnection.
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DOI of Published Version
https://doi.org/10.1029/2020gl089451
