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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 30, issue 6
Ann. Geophys., 30, 1025–1035, 2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 30, 1025–1035, 2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 29 Jun 2012

Regular paper | 29 Jun 2012

Spatial distribution of rolled up Kelvin-Helmholtz vortices at Earth's dayside and flank magnetopause

M. G. G. T. Taylor1, H. Hasegawa2, B. Lavraud3, T. Phan4, C. P. Escoubet1, M. W. Dunlop5, Y. V. Bogdanova6, A. L. Borg1, M. Volwerk7, J. Berchem8, O. D. Constantinescu9, J. P. Eastwood10, A. Masson1, H. Laakso1, J. Soucek1,11, A. N. Fazakerley6, H. U. Frey4, E. V. Panov7, C. Shen12, J. K. Shi12, D. G. Sibeck13, Z. Y. Pu14, J. Wang14, and J. A. Wild15 M. G. G. T. Taylor et al.
  • 1Science and Robotic Exploration Directorate, ESA/ESTEC, Noordwijk, The Netherlands
  • 2Institute of Space and Astronautical Science, JAXA, Sagamihara, Japan
  • 3IRAP/CNRS, Toulouse, France
  • 4SPRG/SSL , Berkeley, CA, United States
  • 5RAL/STFC, Didcot, UK
  • 6MSSL/UCL, Dorking, UK
  • 7IWF, Graz, Austria
  • 8UCLA/IGPP, Los Angeles, CA, USA
  • 9ISS, Bucharest, Romania
  • 10Imperial College, London, UK
  • 11Institute of Atmospheric Physics, Bocni II 1401, 141 31 Prague, Czech Republic
  • 12CSSAR, Beijing, China
  • 13NASA/GSFC, Greenbelt, MD, USA
  • 14Peking University, Beijing, China
  • 15Lancaster University, Lancaster, UK

Abstract. The 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.

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