HR: 1330h
AN: SM23B-04    [Abstracts]
TI: Magnetosphere-ionosphere coupling initiated at the duskside boundary layer during impulsive IMF rotations
AU: * Farrugia, C J
EM: charlie.farrugia@unh.edu
AF: University of New Hampshire, Space Science Center, Durham, NH United States
AU: Sandholt, P
EM: p.e.sandholt@fys.uio.no
AF: University of Oslo, Department of Physics, Oslo, Norway
AU: Gratton, F T
EM: fgratton@arnet.com.ar
AF: CONICET and University of Buenos Aires,, Buenos Aires, Argentina
AU: Lund, E J
EM: eric.lund@unh.edu
AF: University of New Hampshire, Space Science Center, Durham, NH United States
AU: Cowley, S W
EM: swhc1@ion.le.ac.uk
AF: University of Leicester, Radio and Space Plasma Physics Group, Leicester, United Kingdom
AU: Denig, W F
EM: William.Denig@hanscom.af.mil
AF: Air Force Research Laboratory, Space Vehicles Directorate, Hanscom AFB, MA United States
AU: Wild, J
EM: j.wild@ion.le.ac.uk
AF: University of Leicester, Radio and Space Plasma Physics Group, Leicester, United Kingdom
AU: Mann, I
AF: University of Alberta, Department of Physics, Edmonton, AB Canada
AU: Watermann, J
EM: jfw@dmi.dk
AF: Danish Meteorological Institute, Atmosphere Space Research Division, Denmark
AU: Viljanen, A
EM: ari.viljanen@fmi.fi
AF: Danish Meteorological Institute, Atmosphere Space Research Division, Denmark
AU: Viljanen, A
EM: ari.viljanen@fmi.fi
AF: Finnish Meteorological Institute, Geophysical Research Division, FIN
AU: Yumoto, K
EM: yumoto@geo.kyushu-u.ac.jp
AF: Kyushu University, Space Environment Research Center, Fukuoka, Japan
AB: Observations from ACE, Wind, Cluster, FAST and ground magnetometers and radars, complemented by theory, are presented to illustrate various aspects of Magnetosphere-Ionosphere (M-I) coupling during an event characterized by a sequence of interplanetary directional discontinuities (DDs) impinging on the magnetopshere. The slow (several hours) northward rotation of the IMF is punctuated by these DDs, which include abrupt and simultaneous east-west rotations of the field and flow. Cluster was traversing the duskside magnetopause boundary layer at geomagnetic latitudes of ~30°. Calculations confirm the presence of magnetopause surface waves of Kelvin-Helmholtz origin, in addition to other undulatory motions of large amplitude. The continuous ground coverage from magnetometer arrays and radars allow us to document the ionospheric imprint of this activity. Finally, the M-I coupling during this event is compared to that in a previous Cluster-FAST-Sondrestrom conjunction when Cluster was in the duskside high-latitude boundary layer. This work is supported partially by NASA Grant NAG5-13116
DE: 2736 Magnetosphere/ionosphere interactions
DE: 2753 Numerical modeling
DE: 2760 Plasma convection
DE: 2772 Plasma waves and instabilities
SC: SPA-Magnetospheric Physics [SM]
MN: 2005 Joint Assembly