Seasonal characteristics of F region in lower solar activity period at Zhongshan Station, Antarctica

Longsong, He and Ruiyuan, Liu and Shunlin, Liu and Yonghua, Liu (1999) Seasonal characteristics of F region in lower solar activity period at Zhongshan Station, Antarctica. Advances in Polar Science, 10 (2). pp. 149-154.

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Abstract

Based on data of Digisonde Portable Sounder-4 (DPS-4) in 1995 - 1997, we have analyzed the seasonal variations of F region at Zhongshan Station (69.4°S, 76.4°E). During the summer of Zhongshan Station, F region ionization is mainly controlled by the solar ultraviolet radiation. Similar to the phenomena in mid-latitude area, the value fnF2 is changed with local time. During equinox seasons, soft electron precipitation from the cusp/cleft region seems significant, fnF2 is changed with magnetic local time, and shows the magnetic noon phenomenon. In winter, the effect of the solar radiation on the F region is less than that of summer. Instead, F region is affected by particle precipitation from cusp/cleft region as well as polar plasma convection, therefore, the diurnal variation of f0F2 is more complex and shows two peaks. F region occurs all day in summer, and seldom appears at midnight in equinox. In winter, F region shows two minimums, one is at midnight and the other is at afternoon cusp. Further analysis of the F region spread indicates that in winter the aurora oval passes over the Zhongshan Station is at 1100 UT - 1500 UT.

Item Type:	Article
Related URLs:
Keywords:	F region, magnetic noon phenomenon, F region irregularity zone, Zhongshan Station.
Subjects:	Unspecified
Organizations:	Unspecified
Date Deposited:	27 Apr 2023 11:25
URI:	http://library.arcticportal.org/id/eprint/2187

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