Articles | Volume 16, issue 10
Ann. Geophys., 16, 1138–1143, 1998

Special issue: VIIIe EISCAT

Ann. Geophys., 16, 1138–1143, 1998

  31 Oct 1998

31 Oct 1998

Plasma drift estimates from the Dynasonde: comparison with EISCAT measurements

K. J. F. Sedgemore1,*, J. W. Wright1, P. J. S. Williams1, G. O. L. Jones2, and M. T. Rietveld3 K. J. F. Sedgemore et al.
  • 1Prifysgol Cymru Aberystwyth, Ceredigion, SY23 3BZ, Wales
  • 2British Antarctic Survey, NERC, High Cross, Madingley Rd., Cambridge CB3 OET, England
  • 3EISCAT Scientific Association, Ramfjordmoen, N-9020 Tromsdaten, Norway
  • *Present address: Dept. Physics, University of Southampton, Highfield, S017 1BJ, UK e-mail:

Abstract. Modern ionosondes make almost simultaneous measurements of the time rate of change of phase path in different directions and at different heights. By combining these 'Doppler' measurements and angles of arrival of many such radar echoes it is possible to derive reliable estimates of plasma drift velocity for a defined scattering volume. Results from both multifrequency and kinesonde-mode soundings at 3-min resolution show that the Dynasonde-derived F-region drift velocity is in good agreement with EISCAT, despite data loss during intervals of 'blanketing' by intense E-region ionisation. It is clear that the Tromsø Dynasonde, employing standard operating modes, gives a reliable indication of overall convection patterns during quiet to moderately active conditions.

Key words. Auroral ionosphere · Plasma convection · Instruments and techniques

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