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《Chinese Journal of Geophysics》 2015-01
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A comparative study of the cosmic noise absorption Keograms generated by two different quiet day curve techniques

HE Fang;HU Hong-Qiao;YANG Hui-Gen;HU Ze-Jun;SOA Key Laboratory for Polar Research Institute of China;Key Laboratory of Earth and Planetary Physics,Chinese Academy of Sciences;  
Observation results of the Image Riometer at Zhongshan Station,Antarctica have been reported during the solar event on 12-14 th July,2012.In order to evaluate the performance of two quiet day curve(QDC)generation techniques,cosmic noise absorption Keograms were built and analyzed.Due to the existence of the ionosphere and the changes of electron density in the ionosphere with the solar zenith angle,it is commonly expected to find diurnal variations in the received cosmic noise level.The cosmic noise absorption level is calculated based on the two different QDCs for 8×8array.The data of zenith row and column are extracted to get Keograms in different directions.The differences between the Keograms are analyzed.These Keogram images revealed some irregularly distributed absorption regions along the analyzed periods in the figures generated by both QDC techniques.However,a visual comparativeanalysis showed that all these regions seemed to be more intensive by He′s techniques.The images indicated that He′s technique for determining QDC allows us to infer that there is a region with weaker absorption near the N5E8 beam which enhanced and then faded from 19∶23∶41UT to 19∶26∶30UT. However,the same phenomenon was not shown for that of Tanaka′s technique.The Keogram obtained from 18∶28 UT to 18∶32 UT show that there are two tiny weak absorption areas merging into one giant absorption region in northwest beams,while the evolution process is not clearly displayed in Tanaka′s sequence.By comparing the CNA results with the in situ aurora Keogram,we found that He′s technique is appeared to produce a better QDC which will result in a more consistent CNA Keogram with in situ aurora Keogram.The results showed that the similar variation trends could be found on both Keograms while intense absorption occurred,but in the weak absorption regions fine structures were better expressed on the Keograms generated by the QDC proposed by He et al.It was suggested that the QDC technique proposed by He et al.makes a better description of horizontal movement of the absorption regions by depicting weak absorption regions which sometimes plays the role of link between two intense absorption regions.
【Fund】: 国家自然科学基金青年项目(41104105);国家自然科学基金面上项目(41374159);; 南极环境综合考察与评估专项南极环境综合分析与评价专题(CHINARE-2015-04-01)资助
【CateGory Index】: P352;P353
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【Citations】
Chinese Journal Full-text Database 1 Hits
1 HE Fang;HU HongQiao;HU ZeJun;LIU RuiYuan;SOA Key Laboratory for Polar Science,Polar Research Institute of China;Key Laboratory of Ionospheric Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences;;A new technique for deriving the quiet day curve from imaging riometer data at Zhongshan Station, Antarctic[J];中国科学:技术科学(英文版);2014-10
【Secondary Citations】
Chinese Journal Full-text Database 2 Hits
1 LIU Ruiyuan~(1,2), HU Hongqiao~1, HE Longsong~1,LIU Yonghua~1, LIU Shunlin~(1,2), LI Shenggui~1, N. Sato~3 & B. J. Fraser~4 1. Polar Research Institute of China, Shanghai 200129, China; 2. Department of Radio Science and Technology, Wuhan University, Wuhan 430072, China; 3. National Institute of Polar Research, Tokyo 173, Japan; 4. Department of Physics, University of Newcastle, Australia;Multiple ground-based observations at Zhongshan Station during the April/May 1998 solar events[J];中国科学A辑(英文版);2002-S1
2 HE Fang*, ZHANG BeiChen & HUANG DeHong SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China;Averaged NmF2 of cusp-latitude ionosphere in northern hemisphere for solar minimum—Comparison between modeling and ESR during IPY[J];中国科学:技术科学(英文版);2012-05
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