Dawn-Dusk Asymmetries in Geospace

Friday, 19 December 2014: 1:40 PM
Andrew P Walsh, European Space Agency, ESAC, Villanueva de la Cañada, Spain, Stein Haaland, University of Bergen, Bergen, Norway, Colin Forsyth, University College London, London, United Kingdom, Amy M Keesee, West Virginia University, Morgantown, WV, United States, Jennifer Kissinger, NASA Goddard Space Flight Center, College Park, MD, United States, Kun Li, Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany, Andrei Runov, UCLA, Los Angeles, CA, United States, Jan Soucek, Academy of Sciences of the Czech Republic, Prague, 182, Czech Republic, Brian Walsh, University of California Berkeley, Space Sciences Laboratory, Berkeley, CA, United States, Simon Wing, Johns Hopkins University, Baltimore, MD, United States and Matthew G Taylor, ESTEC, Noordwijk, 2201, Netherlands
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.