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Spatial Distribution of Rolled up Kelvin-Helmholtz Vortices at Earth's Dayside and Flank MagnetopauseThe Kelvin-Helmholtz Instability (KHI) can drive waves at the magnetopause. These waves can grow to form rolled-up vortices and facilitate transfer of plasma into the magnetosphere. To investigate the persistence and frequency of such waves at the magnetopause we have carried out a survey of all Double Star 1 magnetopause crossings, using a combination of ion and magnetic field measurements. Using criteria originally used in a Geotail study made by Hasegawa et al. (2006) (forthwith referred to as H2006), 17 candidate events were identified from the entire TC-1 mission (covering 623 orbits where the magnetopause was sampled), a majority of which were on the dayside of the terminator. The relationship between density and shear velocity was then investigated, to identify the predicted signature of a rolled up vortex from H2006 and all 17 events exhibited some level of rolled up behavior. The location of the events had a clear dawn-dusk asymmetry, with 12 (71 %) on the post noon, dusk flank suggesting preferential growth in this region.
Document ID
20140005988
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.5194/angeo-30-1025-2012
Authors
Taylor, M. G. G. T. (European Space Agency. European Space Research and Technology Center, ESTEC Noordwijk, Netherlands)
Hasegawa, H. (Institute of Space and Astronautical Science Sagamihara, Japan)
Lavraud, B. (Centre National de la Recherche Scientifique Toulouse, France)
Phan, T. (California Univ. Berkeley, CA, United States)
Escoubet, C. P. (European Space Agency. European Space Research and Technology Center, ESTEC Noordwijk, Netherlands)
Dunlop, M. W. (Science and Technology Facilities Council (STFC) Didcot, United Kingdom)
Bogdanova, Y. V. (University Coll. London, United Kingdom)
Borg, A. L. (European Space Agency. European Space Research and Technology Center, ESTEC Noordwijk, Netherlands)
Volwerk, M. (Institut fuer Weltraumforschung Graz, Austria)
Berchem, J. (California Univ. Los Angeles, CA, United States)
Constantinescu, O. D. (Institute of Space Sciences Bucharest, Romania)
Eastwood, J. P. (Imperial Coll. of London London, United Kingdom)
Masson, A. (European Space Agency. European Space Research and Technology Center, ESTEC Noordwijk, Netherlands)
Laakso, H. (European Space Agency. European Space Research and Technology Center, ESTEC Noordwijk, Netherlands)
Soucek, J. (European Space Agency. European Space Research and Technology Center, ESTEC Noordwijk, Netherlands)
Fazakerley, A. N. (University Coll. London, United Kingdom)
Frey, H. U. (California Univ. Berkeley, CA, United States)
Panov, E. V. (Institut fuer Weltraumforschung Graz, Austria)
Shen, C. (Center for Space Sciences and Applied Research Beijing, China)
Shi, J. K. (Center for Space Sciences and Applied Research Beijing, China)
Sibeck, D. G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Pu, Z. Y. (Peking Univ. Beijing, China)
Wang, J. (Peking Univ. Beijing, China)
Wild, J. A. (Lancaster Univ. United Kingdom)
Date Acquired
May 20, 2014
Publication Date
June 29, 2012
Publication Information
Publication: Annales Geophysicae
Publisher: Copernicus
Volume: 30
Issue: 6
ISSN: 0992-7689
Subject Category
Space Sciences (General)
Geophysics
Report/Patent Number
GSFC-E-DAA-TN9295
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
dawn-dusk asymmetry
magnetopause crossings
Kelvin-Helmholtz Instability

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