Simulated midlatitude summer nighttime anomaly in realistic geomagnetic fields
Simulated midlatitude summer nighttime anomaly in realistic geomagnetic fields
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DOI：
10.1029/2011ja017010
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发表时间：
2012-03
影响因子：
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通讯作者：
Z. Ren;W. Wan;Libo Liu;H. Le;M. He
中科院分区：
文献类型：
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作者：
Z. Ren;W. Wan;Libo Liu;H. Le;M. He
本文利用中国科学院地质与地球物理研究所的三维地球电离层理论模型（TIME 3D-IGGCAS），模拟了中纬度夏季夜间异常（MSNA）的时空分布以及热层纬向风和纬向风对MSNA形成的影响。MSNA主要出现在三个不同的区域，即东亚区域、北方大西洋-欧洲区域和南太平洋区域。南太平洋地区的MSNA明显强于其他两个地区。在这三个地区，MSNA不仅发生在当地的夏季，也经常发生在春分。热层风通过抬升或降低F区电离度，主要驱动MSNA的形成。在东亚地区和北方大西洋-欧洲地区，MSNA主要由热层纬向风驱动，热层纬向风的影响可以忽略不计。然而，虽然南太平洋地区的MSNA（或威德尔海异常）主要是由热层纬向风驱动的，但热层纬向风在MSNA的形成中也起着重要作用。
In the present work, using the three‐dimensional theoretical ionospheric model of the Earth in Institute of Geology and Geophysics, Chinese Academy of Sciences (TIME3D‐IGGCAS), we simulate the temporal‐spatial distribution of the midlatitude summer nighttime anomaly (MSNA) and the influences of thermospheric meridional and zonal winds on the formation of MSNA. MSNA mainly appears in three distinct regions, the East Asian region, the northern Atlantic‐Europe region and the South Pacific region. MSNA in the South Pacific region is obviously stronger than that in the other two regions. In these three regions, MSNA not only occurs in local summer, but also often occurs in Equinox. Through lifting up or lowering theFregion ionization, thermospheric winds mainly drive the formation of MSNA. In the East Asian region and the northern Atlantic‐Europe region, MSNA are mainly driven by the thermospheric meridional wind, and the influence of the thermospheric zonal wind can be neglected. However, although MSNA in the South Pacific region (or Weddell Sea Anomaly) are mainly driven by the thermospheric meridional wind, the thermospheric zonal wind also plays an important role in the formation of MSNA.