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Wavelet Analyses of Geomagnetic Data regarding Major Geomagnetic Disturbances

Journal of Environmental Science and Engineering(B) 2021年第1期10卷 31-39页

作者： Laurentiu asimopolos Natalia-Silvia asimopolos adrian aristide asimopolos Geological Institute of Romania Caransebes str.1012271BucharestRomania Faculty of Transportation University POLITEHNICA of BucharestSplaiul Independenei str.313060042 BucharestRomania

The purpose of this study was to analyze the associated spectrum of geomagnetic field,frequencies intensity and the time of occurrence.We calculated the variation of the correlation coefficients,with mobile windows of various sizes,for the recorded magnetic components at different latitudes and latitudes.The observatories we included in our study are USA(Surlari),HON(Honolulu),SBA(Scott Base),KAK(Kakioka),THY(Tihany),UPS(Uppsala),WNG(Wingst)and Yellowknife(YKC).We used the data of these observatories from International Real-time Magnetic Observatory Network(INTERMAGNET)for the geomagnetic storm from October 28-31,2003.We have used for this purpose a series of filtering algorithms,spectral analysis and wavelet with different mother functions at different levels.In the paper,we show the Fourier and wavelet analysis of geomagnetic data recorded at different observatories regarding geomagnetic storms.Fourier analysis hightlights predominant frequencies of magnetic field components.Wavelet analysis provides information about the frequency ranges of magnetic fields,which contain long time intervals for medium frequency information and short time intervals for highlight frequencies,details of the analyzed signals.Also,the wavelet analysis allows us to decompose geomagnetic signals in different waves.The analyses presented are significant for the studies of the geomagnetic storm.The data for the next days after the storm showed a mitigation of the perturbations and a transition to quiet days of the geomagnetic field.

关键词： Fourier spectral deconvolution wavelet analyses geomagnetic disturbances geomagnetic observatories

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The Organizing of Database from Surlari National Geomagnetic Observatory

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Journal of Environmental Science and Engineering(A) 2021年第1期10卷 26-33页

作者： Natalia-Silvia asimopolos Laurentiu asimopolos Bogdan Balea adrian aristide asimopolos Geological Institute of Romania Caransebes str.1012271BucharestRomania Faculty of Transportation University POLITEHNICA of BucharestSplaiul Independenei str.313060042 BucharestRomania

Our paper describes the organizing of database,remarks about SNGO(Surlari National Geomagnetic Observatory)and network infrastructure.Based on the geomagnetic data acquired and stored on the database server,we perform the processing and analysis of geomagnetic parameters through different spectral,statistical and correlation methods.All these parameters are included in the geomagnetic database on server.The web interface for the database meets the different needs of handling the data collected,raw or processed.The server-side programming language used for design is php.This allow us to select different periods for which access to stored data,required for different search filters and different parameters or data from different time periods can be compared.For a more in-depth analysis of the stored data,through JavaScript programming language graphs for different parameters can be drawn.Access to the web interface can be done with or without authentication,depending on the need to ensure the security of certain data collected,stored and processed.The applications are scalable for different devices that will access it:mobile,tablets,laptops or desktops.

关键词： Geomagnetic observatory database data in real time data acquisition data processing

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