Modeling of the ionospheric response to the solar eclipse of 24 October 1995
Modeling of the ionospheric response to the solar eclipse of 24 October 1995
复制标题
DOI：
10.3319/tao.2000.11.2.543(a
复制
发表时间：
2000-06
影响因子：
0.8
通讯作者：
Libo Liu;W. Wan;J. Tu;Zhenan Bao
中科院分区：
文献类型：
--
作者：
Libo Liu;W. Wan;J. Tu;Zhenan Bao
本文利用一个二维电离层理论模型研究了1995年10月24日日食的电离层效应。在计算中，在日食条件下，只考虑了日食过程中太阳EUV通量的下降。（1）日食期间，电离层低层的光学效应比较明显，而高层对日食的响应较弱、延迟，但持续时间较长。（2）磁纬越低，对日食的响应越强。在低纬度地区，f。日食日的F2值低于对照，而hmF2值高于对照。（3）在磁赤道附近，hmF_2在最大遮蔽相之后发生急剧的转变，在F_2层正常峰高之下出现太阳F_1.5层。（4）极盛相后，海南附近的日食影响持续时间较长，在磁赤道上出现了次级低压。这里讨论了可能对日食引起的影响负责的机制。
In this paper the ionospheric effects of the solar eclipse of October 24, 19995 were investigated using a two-dimensional ionospheric theoretical model. In the calculations, only the depression of solar EUV fluxes during the course of the eclipse was taken into account under the solar eclipse condition.(1)During the period of the eclipse, the optical effects were quite clear at the lower altitudes of the ionosphere, while the responses to the eclipse were weaker, delayed, but longer in duration at the higher altitudes.(2)The lower the magnetic latitude, the stronger was the response to the solar eclipse. In low latitude regions, the values of f。F2 on the eclipse day were lower compared with those under the control conditions, whereas hmF2 values were higher.(3)Near the magnetic equator there was a sharp transition in hmF2 after the maximum phase of obscuration, and a solar F1.5 layer appeared below the normal peak height of the F2 layer.(4)After the maximum phase, the effects of the eclipse lasted longer near Hainan, and a secondary depression occurred over the magnetic equator. The mechanisms that may be responsible for the eclipse-caused effects are discussed here.