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Author(s): |
You-tian Niu, College of Physics and Information Engineering, Henan Normal University,Xinxiang 453007,China
Xiao-nian He, College of Physics and Information Engineering, Henan Normal University,Xinxiang 453007,China
Zhong-yuan Zhang, College of Physics and Information Engineering, Henan Normal University,Xinxiang 453007,China
xFang-yu Zhang, College of Physics and Information Engineering, Henan Normal University,Xinxiang 453007,China
Ning-ning Li, Henan Key Laboratory of Photovoltaic Materials,Xinxiang 453007,China |
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Abstract: |
The solar flare and the total solar eclipse can bring great disturbances to the ionosphere, which could cause a series of geophysical phenomenas and may give influence to the people’s producing and living, such as very low frequency signal sudden phase anomaly, short waves communication fadeout, the satellite location and communication abnormities, deathful hurt to astronauts, a great area power-cut accident, traffic safety accident, etc. The influences of the solar flares and the total solar eclipse are particularly compared and analyzed on the VLF signal propagation based on theory and experiment. On March 9, 1997, the peak VLF phase delay that was caused by the total solar eclipse on the VLF signals propagation path from Alpha system’s main station to Xinxiang spite is about 16.7 cent cycles(cec), causing a increase of about 7.89km in the low ionosphere effective reflection height. But the solar flare can make the VLF signal phase a sudden advance, bringing a decrease in the low ionosphere effective reflection height. By the wave guide mode calculation, the total solar eclipse’s influence on VLF phase is similarly like the anti-variety of VLF phase that is caused by the M4.9-class solar flare which peak flux of 1-8? X-rays approximately equals to 4.9×10-5W/m2.
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