Intensity variations of the postnoon auroral bright spots observed at Zhongshan Station, Antarctica on August 8, 1999

ADVANCES IN POLAR SCIENCE ›› 2002, Vol. 13 ›› Issue (1-English): 15-22.

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Intensity variations of the postnoon auroral bright spots observed at Zhongshan Station, Antarctica on August 8, 1999

Ai Yong¹, Deng Xiaohua¹, Liu Ruiyuan², Yang Huigen² and Masayuki Kikuchi³

¹ College of Electronic Information, Wuhan University, Wuhan 430079, China;
² Polar Research Institute of China, Shanghai 200129, China;
³ National Institute of Polar Research, Tokyo 173, Japan

Online:1952-03-30 Published:1952-03-30
Contact: Ai Yong

Abstract

Abstract:

In this paper we use the high speed multi channel meridian scanning photometer data and all-sky TV camera images to analyze the intensity variations of the postnoon auroral bright sports of 557.7 nm and 630.0 nm emissions. Several results can be obtained from this paper. (1) Bright spots are rather transient features lasting typically for only a few minutes. (2) The intensity of the postnoon bright spots of 557.7 nm emissions can surpass 11 kR. The occurrence of the bright spots seems rather frequent. (3) The ratios of I(427.8)/I(630.0) and I(427.8)/I(557.7) during the bright spots occurring time show a positive peak and negative peak respectively. It qualitatively indicates that the average precipitating electron energies along the meridianal scan above Zhongshan Station increased as the bright spot appeared. And the intensification of the spot mainly was caused by the increasing of high energy (3-10 keV) flux. (4) Usually the bright spots are accompanied with the magnetic pulsation and the occurrence of multi band arcs.

Key words: aurora, bright spots, intensity, Zhongshan Station

Ai Yong, Deng Xiaohua, Liu Ruiyuan, Yang Huigen, Masayuki Kikuchi. Intensity variations of the postnoon auroral bright spots observed at Zhongshan Station, Antarctica on August 8, 1999[J]. ADVANCES IN POLAR SCIENCE, 2002, 13(1-English): 15-22.

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Intensity variations of the postnoon auroral bright spots observed at Zhongshan Station, Antarctica on August 8, 1999

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