Reply to comment by A. V. Mikhailov and L. Perrone on “The winter anomaly in the middle‐latitude F region during the solar minimum period observed by the Constellation Observing System for Meteorology, Ionosphere, and Climate”
Reply to comment by A. V. Mikhailov and L. Perrone on “The winter anomaly in the middle‐latitude F region during the solar minimum period observed by the Constellation Observing System for Meteorology, Ionosphere, and Climate”
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DOI：
10.1002/2014ja020445
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发表时间：
2011-02
期刊：
影响因子：
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通讯作者：
W. Lee;H. Kil;Y. Kwak;Qian Wu
中科院分区：
文献类型：
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作者：
W. Lee;H. Kil;Y. Kwak;Qian Wu
[1]中纬度地区冬季异常（或季节异常）是指冬季在f峰高度处的白天等离子体密度（NmF2）大于夏季的现象。来自星座气象、电离层和气候观测系统（COSMIC）卫星的无线电掩星测量为研究全球尺度的冬季异常提供了新的数据来源。本文通过分析2007年在磁平静期（Kp≤3）观测到的COSMIC数据，研究了中纬度电离层电子密度的高度、当地时间、经纬度和半球变化。从COSMIC数据得到的NmF2的季节平均行为表明，在0800-1600 LT期间，北半球出现冬季异常特征，而南半球没有。冬季异常的强度随经度的变化而变化，在接近磁极的经度处可能出现更强烈的冬季异常。在北中纬度地区，在f峰高度附近的狭窄海拔范围内，冬季电子密度大于夏季。除中纬度北部冬季异常外，南北半球中纬度夏季电子密度均大于冬季。
[1] The winter anomaly (or seasonal anomaly) at middle latitudes is a phenomenon during which the daytime plasma density at the F-peak height (NmF2) is greater in winter than in summer. Radio occultation measurements from the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) satellites provide a new data source for study of the winter anomaly on a global scale. In this study we investigate the altitude, local time, latitude, longitude, and hemispheric variations of the electron density in the middle-latitude ionosphere by analyzing the COSMIC data measured in 2007 during a magnetically quiet period (Kp ≤ 3). The seasonal mean behavior of the NmF2 obtained from COSMIC data shows the occurrence of the winter anomaly feature during 0800–1600 LT in the Northern Hemisphere but not in the Southern Hemisphere. The intensity of the winter anomaly is variable with longitude, and a more intense winter anomaly is likely to occur at longitudes closer to the magnetic pole. At northern middle latitudes, a greater electron density in the winter than in the summer occurs in the narrow altitude range near the F-peak height. Except for the winter anomaly feature at northern middle latitudes, the electron density at middle latitudes is greater during the summer than during the winter in both hemispheres.