Articles | Volume 18, issue 8
Ann. Geophys., 18, 918–926, 2000
Ann. Geophys., 18, 918–926, 2000

  31 Aug 2000

31 Aug 2000

Comparison of the orientation of small-scale electron density irregularities and F region plasma flow direction

E. D. Tereshchenko1, B. Z. Khudukon1, M. O. Kozlova1, O. V. Evstafiev1, T. Nygrén2, M. T. Rietveld3, and A. Brekke4 E. D. Tereshchenko et al.
  • 1Polar Geophysical Institute, 15 Khalturina, 183010 Murmansk, Russia
  • 2Department of Physical Sciences, University of Oulu, P.O. Box 3000, FIN-90401 Oulu, Finland
  • 3EISCAT, N-9027 Ramfjordbotn, Norway; also at Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany
  • 4Auroral Observatory, University of Tromsø, N-9037 Tromsø, Norway
  • Correspondence to: T. Nygrén; e-mail:

Abstract. Results are shown from an experimental campaign where satellite scintillation was observed at three sites at high latitudes and, simultaneously, the F region plasma flow was measured by the nearby EISCAT incoherent scatter radar. The anisotropy parameters of field-aligned irregularities are determined from amplitude scintillation using a method based on the variance of the relative logarithmic amplitude. The orientation of the anisotropy in a plane perpendicular to the geomagnetic field is compared with the direction of F region plasma flow. The results indicate that in most cases a good agreement between the two directions is obtained.

Key words: Ionosphere (auroral ionosphere; ionospheric irregularities)