Locating the polar cap boundary of postnoon sector from observations of 630.0 nm auroral emission at Zhongshan Station |
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Authors: | Liu Li-gang Ai Yong Liu Rui-yuan Yang Hui-gen |
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Institution: | (1) School of Electronic Information, Wuhan University, 430072 Wuhan, Hubei, China;(2) Polar Research Institute of China, 200129 Shanghai, China |
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Abstract: | We studied the ground observations of 630.0 nm auroral emission at Zhongshan Station to determine the polar cap boundary with
the latitudinal profile of emission intensity. The open-closed field time boundary is assumed to lie at the boundary between
polar rain and plasma sheet precipitation. We assume that nonprecipitation-dependent sources of 630.0 nm emission cause a
spatially uniform luminosity in the polar cap and that auroral zone luminosity is also spatially uniform. Therefore we determine
the location of the polar cap boundary of postnoon sector from the auroral emission data each time by finding the best fit
of the observations to a step function in latitude and we produce a time series of the location of the polar cap boundary.
The average error of the practice in the paper is less than 0.8 degree.
Foundation item: Supported by the National Natural Science Foundation of China (No. 40044013)
Biography: Liu Li-gang (1976-), male, Master candidate, research direction: auroral physics. |
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Keywords: | polar cap boundary aurora Zhongshan Station |
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