Equivalent electron densities at reflection heights of tweek atmospherics in the low-middle latitude D-region ionosphere

被引：0
作者：
H. Ohya
M. Nishino
Y. Murayama
K. Igarashi
机构：
[1] Chiba University,Department of Electronics and Mechanical Engineering
[2] Nagoya University,Solar
[3] Communications Research Laboratory,Terrestrial Environment Laboratory
来源：
Earth, Planets and Space | 2003年 / 55卷
关键词：
Tweek atmospherics; cut-off frequency; equivalent electron densities (reflection heights);
D O I：
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中图分类号：
学科分类号：
摘要：
Tweek atmospherics are ELF/VLF pulse signals with frequency dispersion characteristics that originate from lightning discharges and propagate in the Earth-ionosphere waveguide mode over long distances. In this paper, we estimate equivalent nighttime electron densities at reflection heights in D-region ionosphere at low-middle latitudes by accurately reading the first-order mode cut-off frequency of tweek atmospherics. The estimation method was applied to tweek atmospherics received simultaneously at Moshiri and Kagoshima in Japan. Equivalent electron densities ranged from 20—28 el./cm3 at ionospheric reflection heights of 80—85 km. Comparing our estimates with electron density profiles obtained from the IRI-95 model, MF radar measurements, and rocket experiments revealed almost consistent results for the lower part of the D-region ionosphere. The tweek method has the unique advantage of enabling reflection-height (equivalent electron densities) monitoring over a wide area of several thousand kilometers.
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页码：627 / 635
页数：8
相关论文
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