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1998年11月17日狮子座流星雨的次声观测
引用本文:苏昉,苏骁.1998年11月17日狮子座流星雨的次声观测[J].应用声学,2000,19(3):1-6.
作者姓名:苏昉  苏骁
作者单位:1. 石油大学(北京)基础科学系北京 102200
2. 北京信息工程学院计算机科学与技术系北京 100101
基金项目:石油大学(北京)科研基金资助项目, 批准号: 99-I-02-5
摘    要:采用三台CSH-1型次声接收器,在北京昌平区布置了一个次声测量三点阵,并观测到1998年11月17日狮子座流星雨产生的次声波P-t曲线和波速波向图,借助快速富立叶变换,分析P-t曲线的波形得到次声的三维动态谱,频谱分析结果表明,(1)各流星产生的次声波大都很短暂,持续时间在1-5分钟内;(2)流星次声波的周期都在40-408秒内,少数在1-480秒内;(3)在11月17日19:21-20:41期间

关 键 词:三点阵  三维动态谱  狮子座流星雨  次声观测
修稿时间:1999年11月11

Infrasonic observation of meteor shower from Leo on November 17, 1998
Su Fang and Su Xiao.Infrasonic observation of meteor shower from Leo on November 17, 1998[J].Applied Acoustics,2000,19(3):1-6.
Authors:Su Fang and Su Xiao
Abstract:A tripartite array for infrasonic measurement in Changping county, Beijing was arranged,using three CSH-1 infrasonic receivers. The infrasonic signals(P-t curve and wave vector) produced by the meteor shower from Leo on November 17,1998 were observed. With fast Fourier transform, the waveforms of P-t curve were analyzed and corresponding dynamic three-dimensional spectra were obtained. The analytic results show. (1)Infrasonic waves produced by meteor are mostly very short, lasting one to five minutes; (2)Periods of the infrasonic waves range mostly from 40 to 408 seconds with a few from 1 to 480 seconds; (3) During 7:21 p.m. to 8.41p.m. (Beijing time ) on Nov. 17,the infrasonic waves were much denser. After 8.41 p.m. waves became more and more sparse, the phenomenon conformed with observation with naked eyes, (4) Amplitudes of infrasonic waves from indordual meteors differ significantly from each other-weaker ones below 5-10 Pa, medium ones within 10-20 Pa, and stronger ones within 20-40 Pa(during 7.20 p.m. to 8.41 p.m. on Nov. 17 and around 1.06, 2:45, 3.59, 5.41, 6.11, 6:20 a.m. on Nov.18). Two of the strongest ones reach 75 Pa and 50 Pa around 7:31 p.m.,8.07 p.m. on Nov. 17. An explanation of the above results was given. This observation will provide a new method and useful scientific data for research in meteor astronomy.
Keywords:Infrasonic wave  Tripartite array  Dynamic three-dimensional spectra  Meteor shower from Leo
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