日本Moshiri地区Schumann共振参数的日变化和季节变化

M. Sekiguchi, Y. Hobara, M. Hayakawa
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引用次数: 15

摘要

. 舒曼共振(SRs)是由全球闪电活动引发的极低频电磁现象。SR模态的频谱特性由三个基本因素表征:(1)共振模态强度,(2)中心频率,(3)q因子(阻尼效应)。这些参数是用Lorenzian近似对日本Moshiri观测到的SR数据估计的。这里使用的SR数据相当于一年的时间,我们特别注意了两个水平磁场分量(h05, Hew)。提出了不同模态(-8 Hz)、第2模态(-14 Hz)和第3模态(-20 Hz)和不同场分量的变化,研究了日变化和季节变化。各模态和分量的强度变化在东南亚(UT -08 h)和美洲(UT -20 h)和非洲(UT -14 h)与闪电活动相关的日变化中表现出3个优势极大值,非洲(UT -14 h)的影响较小。全球闪电活动最大发生在北半球夏季(JJA),南半球夏季(DJF)的闪电活动最小。在Moshiri,不同模态和场分量的频率和q因子的变化在结构上非常复杂,但与最近主要基于Ez和磁观测的研究结果非常吻合。最后讨论了我们的Moshiri结果与以色列最新结果的异同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Diurnal and seasonal variations in the Schumann resonance parameters at Moshiri, Japan
. The Schumann resonances (SRs) are the ELF electromagnetic phenomena, which are triggered by global lightning activity. The spectral characteristics of the SR modes are characterized by three fundamental factors: (1) resonant mode intensity, (2) central frequency, and (3) Q-factor (damping effect). These parameters are ~stimated by Lorenzian approximation to the SR data observed at Moshiri, Japan. The SR data- used here are equivalently one-year long, and we have paid particular attention to two horizontal magnetic-field components (H 05, Hew). Variations of the different modes (1st (-8 Hz), 2nd (-14 Hz) and 3rd (-20 Hz)) and different field components are presented to study the diurnal and seasonal variations. The intensity variations of the various modes and components show three dominant maxima in the diurnal variation related to lightning activity in south-east Asia (UT -08 h) and America (UT -20 h) with minor effect from Africa (UT -14 h). The largest global lightning activity occurs during the northern hemisphere summer (JJA) with the southern hemisphere summer (DJF) having the least lightning activity. The frequency and Q-factor variations of the different modes and field components at Moshiri are very complicated in structure, but agree remarkably well with those by recent studies mainly based on the Ez and magnetic observations. Similarities and differences are finally discussed between our Moshiri results and the latest ones from Israel.
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