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Volume 19, issue 10/12
Ann. Geophys., 19, 1683–1696, 2001
https://doi.org/10.5194/angeo-19-1683-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: CLUSTER

Ann. Geophys., 19, 1683–1696, 2001
https://doi.org/10.5194/angeo-19-1683-2001
© Author(s) 2001. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Sep 2001

30 Sep 2001

Ground-based and satellite observations of high-latitude auroral activity in the dusk sector of the auroral oval

K. Kauristie1, T. I. Pulkkinen1, O. Amm1, A. Viljanen1, M. Syrjäsuo1, P. Janhunen1, S. Massetti2, S. Orsini2, M. Candidi2, J. Watermann3, E. Donovan4, P. Prikryl5, I. R. Mann6, P. Eglitis7, C. Smith8, W. F. Denig9, H. J. Opgenoorth7,1, M. Lockwood10, M. Dunlop11, A. Vaivads7, and M. André7 K. Kauristie et al.
  • 1Finnish Meteorological Institute, Geophysical Research Division, P.O.Box 503, FIN-00101 Helsinki, Finland
  • 2Consiglio Nazionale delle Ricerche, Istituto di Fisica dello Spazio Interplanetario, Rome, Italy
  • 3Danish Meteorological Institute, Solar-Terrestrial Physics Division, Copenhagen, Denmark
  • 4University of Calgary, Department of Physics and Astronomy, Alberta, Canada
  • 5Communications Research Centre, Ottawa, Canada
  • 6University of York, Department of Physics, UK
  • 7Swedish Institute of Space Physics, Uppsala Division, Sweden
  • 8Bartol Research Institute, Delaware, USA
  • 9Air Force Research Laboratory, Hanscom Air Force Base, Massachusetts, USA
  • 10Rutherford Appleton Laboratory, Didcot, UK
  • 11Imperial College, London, UK

Abstract. On 7 December 2000, during 13:30–15:30 UT the MIRACLE all-sky camera at Ny Ålesund observed auroras at high-latitudes (MLAT ~ 76) simultaneously when the Cluster spacecraft were skimming the magnetopause in the same MLT sector (at ~ 16:00–18:00 MLT). The location of the auroras (near the ionospheric convection reversal boundary) and the clear correlation between their dynamics and IMF variations suggests their close relationship with R1 currents. Consequently, we can assume that the Cluster spacecraft were making observations in the magnetospheric region associated with the auroras, although exact magnetic conjugacy between the ground-based and satellite observations did not exist. The solar wind variations appeared to control both the behaviour of the auroras and the magnetopause dynamics. Auroral structures were observed at Ny Ålesund especially during periods of negative IMF BZ. In addition, the Cluster spacecraft experienced periodic (T ~ 4 - 6 min) encounters between magnetospheric and magnetosheath plasmas. These undulations of the boundary can be interpreted as a consequence of tailward propagating magnetopause surface waves. Simultaneous dusk sector ground-based observations show weak, but discernible magnetic pulsations (Pc 5) and occasionally periodic variations (T ~ 2 - 3 min) in the high-latitude auroras. In the dusk sector, Pc 5 activity was stronger and had characteristics that were consistent with a field line resonance type of activity. When IMF BZ stayed positive for a longer period, the auroras were dimmer and the spacecraft stayed at the outer edge of the magnetopause where they observed electromagnetic pulsations with T ~ 1 min. We find these observations interesting especially from the viewpoint of previously presented studies relating poleward-moving high-latitude auroras with pulsation activity and MHD waves propagating at the magnetospheric boundary layers.

Key words. Ionosphere (ionosphere-magnetosphere interaction) – Magnetospheric physics (auroral phenomena; solar wind – magnetosphere interactions)

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