Global response of Magnetic field and Ionosonde observations to intense solar flares on 6 and 10 September 2017
Global response of Magnetic field and Ionosonde observations to intense solar flares on 6 and 10 September 2017
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2017 年 9 月 6 日至 10 日磁场和电离探空仪观测对强烈太阳耀斑的全球响应
DOI：
10.1051/e3sconf/20186201007
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发表时间：
2018
影响因子：
--
通讯作者：
Ikeda Akihiro
中科院分区：
文献类型：
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作者：
Fujimoto Akiko;Yoshikawa Akimasa;Ikeda Akihiro
太阳耀斑期间的强烈X射线通量已知会导致地球电离层D、E和F区域的电离增强。电离层电子密度剖面的突变对无线电通信和导航系统是一个严重的问题。地面磁图经常记录到X射线通量增强期间太阳半球的突然变化，这是由于耀斑引起的电离层电导率增强导致全球电离层电流系统的突然增加。这些地磁场扰动被称为“太阳耀斑效应”（SFE）或地磁钩针[坎贝尔，2003]。典型的SFE是在赤道磁测资料上增加变化。在太阳耀斑期间的电离层观测中，由于电离层的突然扰动，在电离层图上经常会出现高频电波中断现象。2017年9月6日和10日发生了两次强烈的X级太阳耀斑。研究了磁场和电离层对强烈太阳耀斑的响应。太阳耀斑引起的电离层扰动使昼侧磁场变化突然增大。夜侧磁力仪数据无响应。SFE（磁场）的大小与太阳耀斑X射线的大小无关。在昼侧电离层测站的电离图中发现了高频电波的熄灭现象。停电持续时间与电离层测站所在纬度和当地时间有关。夜侧电离图有不同的特点。
Intense X-ray fluxes during solar flares are known to cause enhanced ionization in the Earth’s ionospheric D, E and F region. This sudden change of ionospheric electron density profile is serious problem to radio wave communication and navigation system. The ground magnetograms often record the sudden change in the sunlit hemisphere during the enhanced X-ray flux, due to the sudden increase in the global ionospheric current system caused by the flare-induced enhanced ionospheric conductivity. These geomagnetic field disturbances are known as ‘‘solar flare effects’’ (SFEs) or geomagnetic crochets [Campbell, 2003]. The typical SFE is increase variation on the equatorial magnetic data. On Ionosonde observation during solar flare event, the High-Frequency (HF) radio wave blackout is often detected in ionogram due to the sudden disturbance in ionosphere. Two intense X-class solar flares occurred on 6 and 10 September 2017. We investigated the magnetic field and Ionosonde responses to the intense solar flare events. Dayside magnetic field variations sudden increased due to the ionospheric disturbance resulting from solar flare. There is no response in night side magnetometer data. The magnitude of SFE (magnetic field) is independent of solar flare x-ray magnitude. We found HF radio wave blackout in ionogram at dayside Ionosonde stations. The duration of blackout is dependent of latitude and local time of Ionosonde stations. There is the different feature of ionogram at night side.