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Ann. Geophys., 23, 2903-2907, 2005
www.ann-geophys.net/23/2903/2005/
© European Geosciences Union 2005
Double Star, Cluster, and ground-based observations of magnetic reconnection during an interval of duskward oriented IMF: preliminary results
J. A. Wild1, S. E. Milan1, J. A. Davies2, S. W. H. Cowley1, C. M. Carr3, and A. Balogh3
1Dept. of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, UK
2Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0QX, UK
3Blackett Laboratory, Imperial College, London SW7 2BZ, UK
Abstract. We present a space- and ground-based study exploiting data from the
coordinated Cluster and Double Star missions in order to investigate dayside
magnetic reconnection under BY+ dominated IMF conditions. In-situ
observations of magnetosheath flux transfer events combined with measurements
of pulsed poleward and dawnward directed flows in the pre-noon sector
high-latitude northern hemisphere ionosphere are interpreted as indications
of pulsed magnetic reconnection during an interval in which the IMF remained
relatively steady. Observations of newly-reconnected magnetic flux tubes
anchored in the northern hemisphere both at mid-latitudes and in the vicinity
of the subsolar point suggests that during BY+ dominated IMF, reconnection
is not, as proposed previously, limited to the high-latitude magnetopause.
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