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Volume 16, issue 2
Ann. Geophys., 16, 148–160, 1998
https://doi.org/10.1007/s00585-998-0148-0
© European Geosciences Union 1998
Ann. Geophys., 16, 148–160, 1998
https://doi.org/10.1007/s00585-998-0148-0
© European Geosciences Union 1998

  28 Feb 1998

28 Feb 1998

Simultaneous measurements of X-rays and electrons during a pulsating aurora

N. Østgaard1, J. Stadsnes1, K. Aarsnes1, F. Søraas1, K. Måseide2, M. Smith3, and J. Sharber4 N. Østgaard et al.
  • 1Department of Physics, University of Bergen, Allegaten 55, N-5007 Bergen, Norway
  • 2Department of Physics, University of Oslo, P.O.Box 1048 Blindern, N-0316 Oslo, Norway
  • 3Laboratory for Extraterrestrial Physics, NASA/GSFC, Greenbelt, MD 20771
  • 4Southwest Research Institute, 6220 Culebra Rd., San Antonio, USA

Abstract. The PULSAUR II rocket was launched from Andøya Rocket Range at 23.43 UT on 9 February 1994 into a pulsating aurora. In this paper we focus on the observations of precipitating electrons and auroral X-rays. By using models it is possible to deduce the electron energy spectrum from X-ray measurements. Comparisons are made between the deduced electron fluxes and the directly measured electron fluxes on the rocket. We found the shape of the observed and the deduced electron spectra to fit very well, with almost identical e-folding energies in the energy range from 10 ke V to ~60–80 ke V. For the integrated fluxes from 10.8 to 250 ke V, we found a discrepancy of 30% . By combining two models, we have found a good method of deducing the electron precipitation from X-ray measurements. The discrepancies between calculations and measurements are in the range of the uncertainties in the measurements.

Key words. Ionospheric particle precipitation · Magnetospheric physics · Annual phenomena · Energetic particle

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