Transionospheric attenuation of 100 kHz radio waves inferred from satellite and ground based observations

Transionospheric attenuation of 100 kHz radio waves inferred from satellite and ground based observations
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从卫星和地面观测推断出的 100 kHz 无线电波的跨电离层衰减

DOI:
10.1029/2008gl036988
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发表时间:
2009
影响因子:
5.2
通讯作者:
Fullekrug M
Fullekrug M
中科院分区:
地球科学1区
文献类型:
--
作者:
Fullekrug M

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北方半球大约有50个LORAN(LONG RANGE Navigation)发射机目前向地球大气层发射连续脉冲的100 kHz无线电波,用于海上导航。据发现,100千赫的无线电波从罗兰传输可以检测到的DEMETER卫星在海拔10660公里以上的发射机。这些新的空间电场测量,使夜间跨电离层衰减的确定与地面电场测量相比。卫星上的电场测量表明,LORAN传输的100 kHz无线电波的夜间跨电离层衰减相当于107 -9 mm距离处100 kHz无线电波的夜间亚电离层衰减。得出了100 kHz电波在夜间的跨电离层衰减为35-45 dB的结论。这一结果使未来的太空任务能够量化与瞬态发光事件和地面γ射线闪光相关的闪电放电强度。
Around fifty LORAN (LOng RAnge Navigation) transmitters in the northern hemisphere currently launch continuously pulsed 100 kHz radio waves into the Earth's atmosphere for marine navigation. It is discovered that the 100 kHz radio waves from the LORAN transmissions can be detected by the DEMETER satellite at an altitude of ∼660 km above the transmitters. These novel electric field measurements in space enable the determination of the nocturnal transionospheric attenuation by comparison with ground based electric field measurements. The electric field measurements on the satellite indicate that the nocturnal transionospheric attenuation of 100 kHz radio waves from LORAN transmissions is equivalent to a nocturnal subionospheric attenuation of the 100 kHz radio waves at a distance of ∼7–9 Mm. The radio waves exhibit an average subionospheric attenuation of ∼5 dB/Mm and it is concluded that the nocturnal transionospheric attenuation of 100 kHz radio waves is ∼35–45 dB. This result enables future space missions to quantify the intensity of lightning discharges associated with transient luminous events and terrestrialγ‐ray flashes.
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