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首页> 外文期刊>Atmospheric Chemistry and Physics Discussions >Modeling of very low frequency (VLF) radio wave signal profile due to solar flares using the GEANT4 Monte Carlo simulation coupled with ionospheric chemistry
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Modeling of very low frequency (VLF) radio wave signal profile due to solar flares using the GEANT4 Monte Carlo simulation coupled with ionospheric chemistry

机译：利用GEANT4蒙特卡罗模拟和电离层化学方法对太阳耀斑引起的极低频（VLF）无线电波信号分布进行建模

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pstrongAbstract./strong X-ray photons emitted during solar flares cause ionization in the lower ionosphere (~60 to 100 km) in excess of what is expected to occur due to a quiet sun. Very low frequency (VLF) radio wave signals reflected from the D-region of the ionosphere are affected by this excess ionization. In this paper, we reproduce the deviation in VLF signal strength during solar flares by numerical modeling. We use GEANT4 Monte Carlo simulation code to compute the rate of ionization due to a M-class flare and a X-class flare. The output of the simulation is then used in a simplified ionospheric chemistry model to calculate the time variation of electron density at different altitudes in the D-region of the ionosphere. The resulting electron density variation profile is then self-consistently used in the LWPC code to obtain the time variation of the change in VLF signal. We did the modeling of the VLF signal along the NWC (Australia) to IERC/ICSP (India) propagation path and compared the results with observations. The agreement is found to be very satisfactory./p.
机译：> >摘要。太阳耀斑产生的X射线光子在电离层下层（约60至100 km）引起电离，其量超过了由于安静太阳而产生的电离量。从电离层D区域反射的非常低频（VLF）无线电波信号会受到这种过度电离的影响。在本文中，我们通过数值模拟再现了太阳耀斑期间VLF信号强度的偏差。我们使用GEANT4蒙特卡罗模拟代码来计算由于M级耀斑和X级耀斑而引起的电离率。然后，将模拟结果的输出用于简化的电离层化学模型中，以计算电离层D区域中不同高度的电子密度的时间变化。然后，在LWPC代码中自洽使用所得的电子密度变化曲线，以获取VLF信号变化的时间变化。我们对沿NWC（澳大利亚）到IERC / ICSP（印度）传播路径的VLF信号进行了建模，并将结果与​​观察结果进行了比较。发现该协议非常令人满意。。

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