A study on the main periodicities in interplanetary magnetic field Bz component and geomagnetic AE index during HILDCAA events using wavelet analysis

A.M. Souza E. Echer 1 M.J.A. Bolzan 2 R. Hajra 3, 4
1 INPE - Instituto Nacional de Pesquisas Espaciais
2 Federal University of Goias
3 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
4 INPE - Brazilian Institute for Space Research
Abstract : The interplanetary and geomagnetic characteristics of High-Intensity Long-Duration Continuous AE Activity (HILDCAA) events are studied using wavelet analysis technique. The Morlet wavelet transform was applied to the 1 min interplanetary magnetic field (IMF) Bz component and the geomagnetic AE index during HILDCAA events. We have analyzed the AE data for the events occurring between 1975 and 2011, and the IMF Bz data (both in GSE and GSM) for the events between 1995 and 2011. We analyzed the scalograms and the global wavelet spectrum of the parameters. For 50% of all HILDCAA events, the main periodicities of the AE index are generally between 4 and 12 h. For the Bz component, the main periodicities were found to be less than 8 h for ~56% of times in GSM system and for ~54% of times in GSE system. It is conjectured that the periodicities might be associated with the Alfvén waves which have typical periods between 1 and 10 h. The results are discussed in the light of self organized criticality theory where the physical events have the capacity of releasing a considerable amount of energy in a short interval of time.
Keywords : Wavelet Geomagnetic activity Magnetosphere HILDCAAs
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Article dans une revue
Journal of Atmospheric and Solar-Terrestrial Physics, Elsevier, 2016, 149, pp.81 - 86. 〈10.1016/j.jastp.2016.09.006〉
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https://hal-insu.archives-ouvertes.fr/insu-01382468
Contributeur : Nathalie Rouchon <>
Soumis le : jeudi 27 septembre 2018 - 15:39:00
Dernière modification le : mardi 19 février 2019 - 01:23:28

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A.M. Souza, E. Echer, M.J.A. Bolzan, R. Hajra. A study on the main periodicities in interplanetary magnetic field Bz component and geomagnetic AE index during HILDCAA events using wavelet analysis. Journal of Atmospheric and Solar-Terrestrial Physics, Elsevier, 2016, 149, pp.81 - 86. 〈10.1016/j.jastp.2016.09.006〉. 〈insu-01382468〉

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