A comparison between large‐scale irregularities and scintillations in the polar ionosphere

Geophysical Research Letters - Tập 43 Số 10 - Trang 4790-4798 - 2016
Yanling Wang1, Qinghe Zhang1, P. T. Jayachandran2, M. Lockwood3, Shun‐Rong Zhang4, J. Moen5, Zan‐Yang Xing1, Yu‐Zhang Ma1, M. Lester6
1Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China
2Physics Department, University of New Brunswick, Fredericton, New Brunswick, Canada
3Department of Meteorology, University of Reading, Reading, UK
4Haystack Observatory Massachusetts Institute of Technology Cambridge Massachusetts USA
5Department of Physics, University of Oslo, Oslo, Norway
6Department of Physics and Astronomy, University of Leicester, Leicester, UK

Tóm tắt

AbstractA comparison tool has been developed by mapping the global GPS total electron content (TEC) and large coverage of ionospheric scintillations together on the geomagnetic latitude/magnetic local time coordinates. Using this tool, a comparison between large‐scale ionospheric irregularities and scintillations is pursued during a geomagnetic storm. Irregularities, such as storm enhanced density, middle‐latitude trough, and polar cap patches, are clearly identified from the TEC maps. At the edges of these irregularities, clear scintillations appeared but their behaviors were different. Phase scintillations (σφ) were almost always larger than amplitude scintillations (S4) at the edges of these irregularities, associated with bursty flows or flow reversals with large density gradients. An unexpected scintillation feature appeared inside the modeled auroral oval where S4 were much larger than σφ, most likely caused by particle precipitations around the exiting polar cap patches.

Từ khóa


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Geophysical Research Letters

Tập 43 Số 10

4790-4798

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