NDLI: Northeastward motion of nighttime medium‐scale traveling ionospheric disturbances at middle latitudes observed by an airglow imager

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Northeastward motion of nighttime medium‐scale traveling ionospheric disturbances at middle latitudes observed by an airglow imager

Content Provider	Semantic Scholar
Author	Shiokawa, Kazuo Otsuka, Yuichi Nishitani, Nozomu Ogawa, Tadahiko Tsugawa, Takuya Maruyama, Takashi Nagaokakyo Smirnov, Sergey E. Bychkov, Vitaliy V. Shevtsov, Boris M.
Copyright Year	2008
Abstract	[1] Nighttime medium-scale traveling ionospheric disturbances (MSTIDs) observed in 630-nm airglow images at middle latitudes are known to have a predominantly northwest-southeast phase surface and to move southwestward in the Northern Hemisphere of Earth. However, the mechanisms of MSTID generation and their systematic southwestward motion have not been clarified. In this paper, we report the “northeastward” motion of the MSTIDs observed at Paratunka, Far East Russia (52.97°N, 158.25°E), using an all-sky 630-nm airglow imager at 2000–2300 LT on 19 August 2007. The MSTIDs moved first southwestward but then back northeastward in the northern part of the images. The northeastward motion of the MSTIDs took place coincident with a F layer height decrease observed by an ionosonde at Paratunka. The F layer height decrease was also confirmed by an enhancement of the 630-nm airglow intensity, which seemed to propagate from northeast to southwest. This fact suggests that the F layer height decrease was caused by poleward wind enhancement rather than westward electric field. These observations imply that the F layer height decrease or the poleward thermospheric wind has some role in the northeastward turning of the MSTID propagation direction.
File Format	PDF HTM / HTML
DOI	10.1029/2008JA013417
Alternate Webpage(s)	http://www.ikir.ru/ru/Departments/Paratunka/lre/publications/downloads/art0057en.pdf
Alternate Webpage(s)	https://doi.org/10.1029/2008JA013417
Volume Number	113
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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