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Discussion papers
https://doi.org/10.5194/angeo-2019-70
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-70
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 20 May 2019

Regular paper | 20 May 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Wavelet analysis of the magnetotail response to solar wind fluctuations during HILDCCA events

Adriane Marques de Souza Franco1, Ezequiel Echer1, and Mauricio José Alves Bolzan2 Adriane Marques de Souza Franco et al.
  • 1Division of Space Geophysics, National Institute for Space Research (INPE), Sao Jose dos Campos, 12227-010, Brazil
  • 2Astronomy and Space Physics Laboratory, Federal University of Jataí, Jataí, 75801-615, Brazil

Abstract. In this work a study of the effects of the High-Intensity Long-Duration Continuous AE activity events (HILDCAAs) in the magnetotail was conducted. The aim of this study was to search the main frequencies during HILDCAAs in the Bx component of the geomagnetic field, as well as at the main frequencies which the magnetotail responds to the solar wind during these events. In order to conduct this analysis the wavelet transform was employed in 9 HILDCAA events that occurred after the Cluster mission (2000) and coincided with the Cluster crossing through the tail of the magnetosphere from 2003 to 2007. Altogether, 25 most energetic periods was observed, which 76 % are ≤ 4 hours. The cross wavelet analysis technique was also used for the development of this study. It was applied to data of the Bz-IMF component and the Bx geomagnetic component, searching to obtain the periods in that had the highest correlation between these two series. To obtain these periods is important to identify frequencies on which the coupling of energy is stronger, as well the modulation of the magnetotail by the solar wind during HILDCAA events. The majority of correlation periods between the Bz (IMF) and Bx component of the geomagnetic field observed also were ≤ 4 hours, with 62.9 % of the periods. Thus the magnetotail responds stronger to IMF fluctuations during HILDCCAS at 2–4 hours scales, which are typical substorm periods.

Adriane Marques de Souza Franco et al.
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Adriane Marques de Souza Franco et al.
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Short summary
The wavelet transform was employed in 9 HILDCAA events for intervals that the Cluster crossed the magnetotail in order to identify the most energetic periods of this events in the magnetotail. It was seen that 76 % of the periods identified are ≤ 4 hours. Using the cross wavelet analysis technique between Bz-IMF component and the Bx geomagnetic component, it was identified that the coupling of energy is stronger in periods between 2 and 4 hours, which are typical substorm periods.
The wavelet transform was employed in 9 HILDCAA events for intervals that the Cluster crossed...
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