Low-frequency ionospheric sounding with Narrow Bipolar Event lightning radio emissions: energy-reflectivity spectrum

被引：12

作者：

Jacobson, A. R. ^{[1
]}

Holzworth, R. ^{[1
]}

Shao, X. -M. ^{[2
]}

机构：

[1] Univ Washington, Seattle, WA 98195 USA

[2] Los Alamos Natl Lab, ISR Div, Los Alamos, NM USA

来源：

ANNALES GEOPHYSICAE | 2008年 / 26卷 / 07期

关键词：

ionosphere; ionospheric irregularities; plasma temperature and density; instruments and techniques;

D O I：

10.5194/angeo-26-1793-2008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analyze data on radio-reflection from the D-region of the lower ionosphere, retrieving the energy-reflection coefficient in the frequency range similar to 5-95 kHz. The data are the same as developed for a recent study of ionospheric-reflection height, and are based on recordings of powerful (multi-Gigawatt) radio emissions from a type of narrow (similar to 10 mu s) lightning discharge known as "Narrow Bipolar Events". The sequential appearance of first the groundwave signal, and then the ionospheric single-hop reflection signal, permits us to construct the energy-reflection ratio. We infer the energy reflection's statistical variation with solar zenith angle, angle-of-incidence, frequency, and propagation azimuth. There is also a marginally-significant response of the energy reflectivity to solar X-ray flux density. Finally, we review the relationship of our results to previous published reports.

引用

页码：1793 / 1803

页数：11

共 39 条

[1] EXPERIMENTAL OBSERVATION OF MAGNETIC FIELD EFFECTS ON VLF PROPAGATION AT NIGHT [J].