Thermospheric wind response to a sudden ionospheric variation in the trough: event at a pseudo-breakup during geomagnetically quiet conditions

Shin-ichiro Oyama, Heikki Vanhamäki, Lei Cai, Anita Aikio, Michael Rietveld, Yasunobu Ogawa, Tero Raita, Mirjam Kellinsalmi, Kirsti Kauristie, Boris Kozelov, Atsuki Shinbori, Kazuo Shiokawa, Takuo T. Tsuda & Takeshi Sakanoi
Abstract The thermospheric wind response to a sudden westward turning of the ion velocity at a high latitude was studied by analyzing data obtained with a Fabry–Perot interferometer (FPI; 630 nm), Dynasonde, and Swarm A & C satellites during a conjunction event. The event occurred during a geomagnetically quiet period (Kp = 0 +) through the night, but some auroral activity occurred in the north. The collocated FPI and Dynasonde measured the thermospheric wind (U)...
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