Global distribution of persistence of total electron content anomaly
Global distribution of persistence of total electron content anomaly
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DOI：
10.3390/atmos10060297
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发表时间：
2019-06
期刊：
影响因子：
2.9
通讯作者：
Yang‐Yi Sun;Chieh-Hong Chen;Jann‐Yenq Liu;Tsung‐Yu Wu
中科院分区：
文献类型：
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作者：
Yang‐Yi Sun;Chieh-Hong Chen;Jann‐Yenq Liu;Tsung‐Yu Wu
太阳活动会扰乱全球电离层，并引发快速穿过大面积的电离层天气现象。 By contrast, sometimes the ionospheric plasma density can remain high or low over a certain location for a few days, which are difficult to be attributed to solar activities.本研究显示了中低纬度地区（±60°N 地磁纬度范围内）连续持续超过 24 小时（跨越两条终止线）的正负总电子含量（TEC）异常的位置偏好。 TEC 是在 2005-2018 年 Kp ≤ 3o 地磁安静条件下，从欧洲定轨中心 (CODE) 全球电离层图 (GIM) (ftp://cddis.gsfc.nasa.gov/pub/gps/products/ionex) 获得的。有少数（少于 4%）TEC 异常可以持续超过 24 小时。太平洋西缘火环沿线 TEC 正异常持续存在。中纬度地区 TEC 异常的高度持续性表明，热层中性风有助于异常的形成。应进一步研究火环上空的电离层电场、大气电场（闪光）、大气重力波和中性风的时空异常，以解释TEC异常的持续存在是否与岩石圈活动有关。
Solar activities can disturb the ionosphere globally and induce ionospheric weather phenomena that transit rapidly through a large area. By contrast, sometimes the ionospheric plasma density can remain high or low over a certain location for a few days, which are difficult to be attributed to solar activities. This study shows the location preference of the positive and negative total electron content (TEC) anomalies persisting continuously longer than 24 hours (cross the two terminators) at middle and low latitudes (within ±60ºN geomagnetic latitudes). The TEC is obtained from the global ionospheric map (GIM) of the Center for Orbit Determination in Europe (CODE) (ftp://cddis.gsfc.nasa.gov/pub/gps/products/ionex) under the geomagnetic quiet condition of Kp ≤ 3o during the period of 2005–2018. There are a few (less than 4%) TEC anomalies that can persist over 24 hours. The persistence of the positive TEC anomaly along the ring of fire on the western edge of the Pacific Ocean. The high persistence of the TEC anomalies at midlatitudes suggests that thermospheric neutral wind contributes to the anomaly formation. The temporal and spatial anomalies of the ionospheric electric field, atmospheric electric field (flash), atmospheric gravity wave, and neutral wind over the ring of fire should be further examined for explaining whether the persistence of the TEC anomalies associates with lithospheric activities.