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ULF electromagnetic noise due to random variations of background atmospheric current and conductivityстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 30 декабря 2020 г.
- Авторы: Surkov V.V., Hayakawa M.
- Журнал: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
- Том: 116
- Год издания: 2007
- Первая страница: D11116
- DOI: 10.1029/2006JD007788
- Аннотация: A mechanism of ULF electromagnetic noise generation due to random fluctuations of the atmospheric conductivity and background currents was examined. Current fluctuations similar to 1/f noise, or flicker noise, are assumed to develop inside large-scale atmospheric inhomogeneities such as thunderstorms, hurricanes, mesoscale convective systems, etc. The random current fields are assumed to be steady, uniform, and isotropicinside the inhomogeneity, which, in turn, implies that the spectral density of the process is delta correlated. A correlation radius of the random process is supposed to be dependent on gas transfer and on the acoustic wave propagation due to pressure and temperature gradients in the atmosphere. To relate the electromagnetic spectra with current fields, a transfer matrix was found, and then the correlation matrix and power spectra of the random electromagnetic field were calculated. It was shown that the large-scalerandom fluctuations of the atmospheric background current are capable of sustaining generation of the ULF magnetic noise that can be detected on the ground. The spectral index of magnetic noise was found to be 1.5, which is consistent with observation in the 10^(-2) to 10^(-4) Hz frequency range.
- Добавил в систему: Сурков Вадим Вадимович