{"title":"Influence of the Outer Ionosphere on the Magnetic Field of a Controlled Source in the 0.4–10 Hz Frequency Range","authors":"P. E. Tereshchenko","doi":"10.3103/S0747923922080126","DOIUrl":null,"url":null,"abstract":"<p>The paper considers the results of experimental studies in the wave zone of the field excited by a linear grounded antenna in the 0.4–95 Hz frequency range. As a result, the influence of the outer ionosphere on the magnetic field in the region of frequencies lower than 10 Hz is established statistically reliably. Measurements in the ultralow-frequency and lower-frequency range made it possible to estimate the state of the lower ionosphere and thus show that variations of the measured field in the frequency range less than 10 Hz are due to the influence of the outer ionosphere. Comparison of measurement results with natural electromagnetic noise, including its structured part, permitted an assumption about the relationship between an ionospheric resonator and the appearance of Alfvén resonances with the processes in the Earth’s magnetosphere. It is shown that the lithosphere, in particular, its heterogeneous structure in the field excitation region, plays a significant role in the measured frequency dependence of the field amplitude.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":null,"pages":null},"PeriodicalIF":0.3000,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Seismic Instruments","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.3103/S0747923922080126","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
The paper considers the results of experimental studies in the wave zone of the field excited by a linear grounded antenna in the 0.4–95 Hz frequency range. As a result, the influence of the outer ionosphere on the magnetic field in the region of frequencies lower than 10 Hz is established statistically reliably. Measurements in the ultralow-frequency and lower-frequency range made it possible to estimate the state of the lower ionosphere and thus show that variations of the measured field in the frequency range less than 10 Hz are due to the influence of the outer ionosphere. Comparison of measurement results with natural electromagnetic noise, including its structured part, permitted an assumption about the relationship between an ionospheric resonator and the appearance of Alfvén resonances with the processes in the Earth’s magnetosphere. It is shown that the lithosphere, in particular, its heterogeneous structure in the field excitation region, plays a significant role in the measured frequency dependence of the field amplitude.
期刊介绍：
Seismic Instruments is a journal devoted to the description of geophysical instruments used in seismic research. In addition to covering the actual instruments for registering seismic waves, substantial room is devoted to solving instrumental-methodological problems of geophysical monitoring, applying various methods that are used to search for earthquake precursors, to studying earthquake nucleation processes and to monitoring natural and technogenous processes. The description of the construction, working elements, and technical characteristics of the instruments, as well as some results of implementation of the instruments and interpretation of the results are given. Attention is paid to seismic monitoring data and earthquake catalog quality Analysis.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
