Journal cover Journal topic
Annales Geophysicae Sun, Earth, planets, and planetary systems An interactive open-access journal of the European Geosciences Union
Ann. Geophys., 18, 416-435, 2000
© European Geosciences Union 2000
30 Apr 2000
A survey of magnetopause FTEs and associated flow bursts in the polar ionosphere
D. A. Neudegg1, S. W. H. Cowley1, S. E. Milan1, T. K. Yeoman1, M. Lester1, G. Provan1, G. Haerendel2, W. Baumjohann2, B. Nikutowski3, J. Büchner3, U. Auster4, K.-H. Fornacon4, and E. Georgescu2,5 1Department of Physics and Astronomy, University of Leicester, LE1 7RH, UK
2Max-Planck Institut für Extraterrestrische Physik, Garching, Germany
3Max-Planck Institut für Aeronomie, Katlenburg-Lindau, Germany
4Technische Universität von Braunschweig, Braunschweig, Germany
5Institute of Space Science, Bucharest, Romania
Correspondence to: D. A. Neudegg
Abstract. Using the Equator-S spacecraft and SuperDARN HF radars an extensive survey of bursty reconnection at the magnetopause and associated flows in the polar ionosphere has been conducted. Flux transfer event (FTE) signatures were identified in the Equator-S magnetometer data during periods of magnetopause contact in January and February 1998. Assuming the effects of the FTEs propagate to the polar ionosphere as geomagnetic field-aligned-currents and associated Alfvén-waves, appropriate field mappings to the fields-of-view of SuperDARN radars were performed. The radars observed discrete ionospheric flow channel events (FCEs) of the type previously assumed to be related to pulse reconnection. Such FCEs were associated with \sim80% of the FTEs and the two signatures are shown to be statistically associated with greater than 99% confidence. Exemplary case studies highlight the nature of the ionospheric flows and their relation to the high latitude convection pattern, the association methodology, and the problems caused by instrument limitations.

Key words: Ionosphere (polar ionosphere) · Magnetospheric physics (magnetosphere-ionosphere interaction; solar wind-magnetosphere interactions)

Citation: Neudegg, D. A., Cowley, S. W. H., Milan, S. E., Yeoman, T. K., Lester, M., Provan, G., Haerendel, G., Baumjohann, W., Nikutowski, B., Büchner, J., Auster, U., Fornacon, K.-H., and Georgescu, E.: A survey of magnetopause FTEs and associated flow bursts in the polar ionosphere, Ann. Geophys., 18, 416-435,, 2000.
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