Unseasonal development of post-sunset F-region irregularities over Southeast Asia on 28 July 2014: 1. Forcing from above?

Carter, B, Ram, S, Yizengaw, E, Pradipta, R, Retterer, J, Norman, R, Currie, J, Groves, K, Caton, R, Terkildsen, M, Yokoyama, T and Zhang, K 2018, 'Unseasonal development of post-sunset F-region irregularities over Southeast Asia on 28 July 2014: 1. Forcing from above?', Progress in Earth and Planetary Science, vol. 5, no. 1, pp. 1-12.


Document type: Journal Article
Collection: Journal Articles

Title Unseasonal development of post-sunset F-region irregularities over Southeast Asia on 28 July 2014: 1. Forcing from above?
Author(s) Carter, B
Ram, S
Yizengaw, E
Pradipta, R
Retterer, J
Norman, R
Currie, J
Groves, K
Caton, R
Terkildsen, M
Yokoyama, T
Zhang, K
Year 2018
Journal name Progress in Earth and Planetary Science
Volume number 5
Issue number 1
Start page 1
End page 12
Total pages 12
Publisher SpringerOpen
Abstract This contribution is the first of a two-part investigation into an unseasonal post-sunset equatorial F-region irregularity (EFI) event ove r the Southeast Asian region on the evening of 28 July 2014. Ground-based GPS scintillation data, space-based GPS radio occultation (RO) data, and ionosonde data show the existence of EFIs shortly after sunset over a region spanning 30° in longitude and 40° in latitude, centered on the geomagnetic equator. This post-sunset EFI event was observed during a time of the year when post-sunset equatorial plasma bubbles (EPBs) are very infrequent in the Southeast Asian longitude sector. GPS RO data shows that the EFI event over Southeast Asia coincided with the suppression of peak-season EPBs in the African and Pacific longitude sectors. Ionosonde data shows the presence of a strong pre-reversal enhancement (PRE) in the upward plasma drift over Southeast Asia prior to the detection of EFIs. Further, it is reported that this PRE was significantly stronger than on any other day of July 2014. An analysis of the geophysical conditions during this event reveals that this enhanced PRE was not caused by disturbed geomagnetic activity. Therefore, it is hypothesized that forcing from lower altitudes, perhaps tidal/planetary waves, was the potential cause of this strong PRE, and the subsequent EPB/EFI activity, on this day over the Southeast Asian sector.
Subject Mesospheric, Ionospheric and Magnetospheric Physics
Keyword(s) Equatorial plasma bubbles
GPS scintillations
Ionosphere
DOI - identifier 10.1186/s40645-018-0164-y
Copyright notice © The Author(s). 2018. Creative Commons Attribution 4.0 International License
ISSN 2197-4284
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