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

0378978 - ÚFA 2013 RIV DE eng J - Journal Article
Taylor, M. G. G. T. - Hasegawa, H. - Lavraud, B. - Phan, T. - Escoubet, C. P. - Dunlop, M. W. - Bogdanova, Y.V. - Borg, A. L. - Volwerk, M. - Berchem, J. - Constantinescu, O. D. - Eastwood, J. P. - Masson, A. - Laakso, H. - Souček, Jan - Fazakerley, A. N. - Frey, H. U. - Panov, E.V. - Shen, C. - Shi, J. K. - Sibeck, D. G. - Pu, Z. Y. - Wang, J. - Wild, J. A.
Spatial distribution of rolled up Kelvin-Helmholtz vortices at Earth's dayside and flank magnetopause.
Annales Geophysicae. Roč. 30, č. 6 (2012), s. 1025-1035. ISSN 0992-7689. E-ISSN 1432-0576
Institutional support: RVO:68378289
Keywords : Magnetospheric physics * Magnetopause, cusp, and boundary layers * Plasma waves and instabilities * Solar wind-magnetosphere interactions
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 1.518, year: 2012
http://www.ann-geophys.net/30/1025/2012/angeo-30-1025-2012.pdf

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 similar to 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.
Permanent Link: http://hdl.handle.net/11104/0210276