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

• Published in: Annales geophysicae (1988) Vol. 35; no. 4; pp. 853 - 868
• Main Authors: Echer, Ezequiel, Korth, Axel, Alves Bolzan, Mauricio José, Reinhard Hans Walter Friedel
• Format: Journal Article
• Language: English; French
• Published: Katlenburg-Lindau Copernicus GmbH 01.01.2017; Copernicus Publications
• Subjects: Auroral electrojet; Auroral electrojets; Auroral zone; Auroral zones; Corotating Interaction Regions (CIR); Earth; Earth orbits; Electrojets; Energy; Fluctuations; Geomagnetism; Geosynchronous orbits; High speed; Indicators; Intervals; Ionosphere; Laboratories; Magnetic field; Magnetic fields; Magnetic flux; Magnetism; Magnetospheres; Magnetospheric substorms; Magnetospheric-solar wind relationships; Magnetotails; Particle settling; Plasma; Regions; Solar cycle; Solar wind; Solar wind velocity; Storms; Streams; Wavelet analysis
• ISSN: 0992-7689; 1432-0576
• DOI: 10.5194/angeo-35-853-2017

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.