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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 7
Ann. Geophys., 17, 877–891, 1999
https://doi.org/10.1007/s00585-999-0877-8
© European Geosciences Union 1999
Ann. Geophys., 17, 877–891, 1999
https://doi.org/10.1007/s00585-999-0877-8
© European Geosciences Union 1999

  31 Jul 1999

31 Jul 1999

Post-noon two-minute period pulsating aurora and their relationship to the dayside convection pattern

S. E. Milan1, T. K. Yeoman1, M. Lester1, J. Moen2, and P. E. Sandholt3 S. E. Milan et al.
  • 1Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
  • E-mail: ets@ion.le.ac.uk
  • 2UNIS, PO Box 156, N-9170 Longyearbyen, Norway
  • 3Department of Physics, University of Oslo, PO Box 1048 Blindern, N-0316 Oslo, Norway

Abstract. Poleward-moving auroral forms, as observed by meridian-scanning photometers, in the vicinity of the cusp region are generally assumed to be the optical signature of flux transfer events. Another class of quasi-continuous, short period (1-2 min) wave-like auroral emission has been identified, closely co-located with the convection reversal boundary in the post-noon sector, which is similar in appearance to such cusp aurora. It is suggested that these short period wave-like auroral emissions, the optical signature of boundary plasma sheet precipitation in the region 1 field-aligned current system, are associated with ULF magnetohydrodynamic wave activity, which is observed simultaneously by ground magnetometer stations. This association with ULF wave activity is strengthened by the observation of several harmonic frequencies in the pulsation spectrum, each an overtone of the fundamental standing wave resonance frequency.

Key words. Magnetospheric physics (auroral phenomena; magnetopause · cusp · and boundary layers; MHD waves and instabilities)

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