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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 35, issue 4
Ann. Geophys., 35, 853–868, 2017
https://doi.org/10.5194/angeo-35-853-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 35, 853–868, 2017
https://doi.org/10.5194/angeo-35-853-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 21 Jul 2017

Regular paper | 21 Jul 2017

Global geomagnetic responses to the IMF Bz fluctuations during the September/October 2003 high-speed stream intervals

Ezequiel Echer1, Axel Korth2, Mauricio José Alves Bolzan3, and Reinhard Hans Walter Friedel4 Ezequiel Echer et al.
  • 1Space Geophysics Division, National Institute for Space Research (INPE), 12227-010, Sao Jose dos Campos, SP, Brazil
  • 2Planetary Department, Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig Weg 3, 37077 Göttingen, Germany
  • 3Space Physics Laboratory, Federal University of Goias, 78804-020, Jataí, GO, Brazil
  • 4Los Alamos National Laboratory, National Security Education Center (NSEC-CSES), MS-T001, Los Alamos, NM 87545, USA

Abstract. In this paper, we follow the coupling from the solar wind to the Earth's magnetotail, geosynchronous orbit, auroral zone and to the ground, during periods of Alfvénic fluctuations in high-speed solar wind streams (HSSs) and their corotating interaction regions (CIRs). We employ cross-wavelet analysis of magnetic field, particle flux and auroral electrojet (AE) index data for the HSSs of September and October 2003. Our results show a remarkably consistent periodic response among all of these regions and across multiple substorm indicators, indicating a possible driven substorm response of the global magnetosphere to the solar wind interplanetary structures. Across the seven intervals studied we find a range of periodic responses from 1.8 to 3.1 h, which is consistent with the 2.75 h peak of the Borovsky et al. (1993) statistical study of inter-substorm periods.

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