GEOLINKS International Conference 2019, Book 1

ENVIRONMENTAL GEOLOGY

STATISTICAL AND SPECTRAL TOOLS FOR ANALYSING OF DISTURBANCE OF GEOMAGNETIC FIELD

Dr. Natalia-Silvia Asimopolos, PhD. Student Adrian Aristide Asimopolos, Dr. Laurentiu Asimopolos

ABSTRACT

In this paper, we performed the wavelet and statistical analysis for the geomagnetic data recorded in the Geomagnetic Surlari Observatory with acquisition periodicity of 0.5 seconds to 1 minute. We have selected several recording periods in the cases of solar quiet day variation, solar disturbance daily variation and geomagnetic storm periods.
For wavelet analysis, I used MATLAB and compared the answer for the used of different mother functions at different levels.
The rapid sampling rate allowed us to highlight micro pulsations and pulsations with periods of time between 2 seconds (minimum detection limit for a discreet signal with a sample interval of 0.5 seconds) and 10 minutes (in the case of Pc5 class pulsations and irregular pulsations from the class Pi3).
Also, we highlighted the continuous pulsations from classes Pc2, Pc3 and Pc4, as well as irregular pulsations from classes Pi1 and Pi2.
In order to identify the periodicities of more than one hour, to half-day and one day periods, we used a series of data for at least 4 days, sampled at 1 minute.
For studying the geomagnetic field morphology in the periods before geomagnetic perturbations, we have developed a series of programs to highlight the associated phenomena of geomagnetic sub-storms and storms.

 

KEYWORDS

disturbance of geomagnetic field, wavelet, spectral analysis, MATLAB

REFERENCE
GEOLINKS International Conference, Conference Proceedings, ISSN 2603-5472, ISBN 978-619-7495-02-7, STATISTICAL AND SPECTRAL TOOLS FOR ANALYSING OF DISTURBANCE OF GEOMAGNETIC FIELD, 83-92 pp, DOI paper 10.32008/GEOLINKS2019/B1/V1/08