Response of lower thermospheric neutral wind at Yellow River Station in Arctic to auroral substorm

doi:10.13679/j.jdyj.20180053

Abstract

Abstract:

To study the behavior of thermospheric neutral wind during the auroral substorm, we used the OI 557 nm interference fringe images measured by all-sky Fabry-Perot interferometer (FPI) during January 25th, 2017 to January 27th, 2017 at Yellow River Station in Arctic to get the horizontal and vertical wind, considering the geomagnetic Kp, AE index and the ion drift velocity, the factor was studied that affected the thermospheric neutral wind during the substorm. The results show that the geomagnetic activity is correlated with the neutral wind in the lower thermosphere. In this observed event, the mean value of horizontal wind is 50 m·s−1 and that of vertical wind is 3 m·s−1 during the geomagnetic calm period. In the geomagnetic active period, the horizontal wind mean 80 m·s−1 ion drag and Joule heating promote the neutral wind movement, the strong geomagnetic activity leads to the vertical wind shear phenomenon, and the ion dragging dominates the neutral wind movement.

Key words: Fabry-Perot interferometer, low thermospheric neutral wind, auroral substorm, ion drag

Qin Minghui, Zhang Yange, Ai Yong. Response of lower thermospheric neutral wind at Yellow River Station in Arctic to auroral substorm[J]. , 2019, 31(2): 191-197.

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