Journal cover Journal topic
Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 32, 705-737, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Review paper
01 Jul 2014
Dawn–dusk asymmetries in the coupled solar wind–magnetosphere–ionosphere system: a review
A. P. Walsh1, S. Haaland2,3, C. Forsyth4, A. M. Keesee5, J. Kissinger6, K. Li2, A. Runov7, J. Soucek8, B. M. Walsh6,11, S. Wing9, and M. G. G. T. Taylor10 1Science and Robotic Exploration Directorate, European Space Agency, ESAC, Villanueva de la Cañada, Madrid, Spain
2Max-Planck-Institute for Solar System Research, Göttingen, Germany
3Birkeland Center for Space Science, University of Bergen, Bergen, Norway
4UCL Department of Space and Climate Physics, Mullard Space Science Laboratory, Holmbury St. Mary, Surrey, UK
5West Virginia University, Morgantown, West Virginia, USA
6NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
7Department of Earth and Space Sciences, UCLA, Los Angeles, California, USA
8Institute of Atmospheric Physics, Czech Academy of Sciences, Prague, Czech Republic
9Johns Hopkins University Applied Physics Laboratory, Maryland, USA
10Science and Robotic Exploration Directorate, European Space Agency, ESTEC, Noordwijk, The Netherlands
11Space Sciences Laboratory, University of California, Berkeley, USA
Abstract. Dawn–dusk asymmetries are ubiquitous features of the coupled solar-wind–magnetosphere–ionosphere system. During the last decades, increasing availability of satellite and ground-based measurements has made it possible to study these phenomena in more detail. Numerous publications have documented the existence of persistent asymmetries in processes, properties and topology of plasma structures in various regions of geospace. In this paper, we present a review of our present knowledge of some of the most pronounced dawn–dusk asymmetries. We focus on four key aspects: (1) the role of external influences such as the solar wind and its interaction with the Earth's magnetosphere; (2) properties of the magnetosphere itself; (3) the role of the ionosphere and (4) feedback and coupling between regions. We have also identified potential inconsistencies and gaps in our understanding of dawn–dusk asymmetries in the Earth's magnetosphere and ionosphere.

Citation: Walsh, A. P., Haaland, S., Forsyth, C., Keesee, A. M., Kissinger, J., Li, K., Runov, A., Soucek, J., Walsh, B. M., Wing, S., and Taylor, M. G. G. T.: Dawn–dusk asymmetries in the coupled solar wind–magnetosphere–ionosphere system: a review, Ann. Geophys., 32, 705-737,, 2014.
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