Midlatitude summer nighttime anomaly of the ionospheric electron density observed by FORMOSAT-3/COSMIC

被引：121

作者：

Lin, C. H. ^{[1
,2
]}

Liu, C. H. ^{[3
]}

Liu, J. Y. ^{[4
]}

Chen, C. H. ^{[5
]}

Burns, A. G. ^{[6
]}

Wang, W. ^{[6
]}

机构：

[1] Natl Cheng Kung Univ, Dept Earth Sci, Inst Space Astrophys & Plasma Sci, Tainan 701, Taiwan

[2] Natl Cheng Kung Univ, Plasma & Space Sci Ctr, Tainan 701, Taiwan

[3] Acedemia Sinica, Taipei 115, Taiwan

[4] Natl Cent Univ, Inst Space Sci, Chungli 32001, Taiwan

[5] Kyoto Univ, Dept Geophys, Grad Sch Sci, Kyoto 6068502, Japan

[6] Natl Ctr Atmospher Res, High Altitude Observ, Boulder, CO 80307 USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2010年 / 115卷

关键词：

F-REGION; LAYER;

D O I：

10.1029/2009JA014084

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This paper presents monthly variations of the midlatitude summer nighttime anomaly (MSNA) of the ionosphere for the first time by global observations of the FORMOSAT-3/COSMIC (F3/C) mission. The anomaly is characterized by the greater nighttime (1800 LT similar to 0200 LT) ionospheric electron density than during daytime (0800 similar to 1800 LT) at middle latitudes during months around June and December solstices. The anomaly shown during December solstice was known as the Weddell Sea Anomaly (WSA) occurring around the Antarctica and nearby the Pacific Ocean. This paper demonstrates that the WSA-like feature also exists in the Northern Hemisphere and is most prominent near the Northeast Asia, Europe/Africa, and Central Pacific longitudes around June solstice. In both hemispheres, the anomalies with similar electron density characteristics and variations caused by the similar mechanism prompts us to name this phenomenon the MSNA. The monthly F3/C observations indicate that the anomaly appears as the most prominent structure of the global ionosphere around midnight hours.

引用

页码：1 / 11

页数：11

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