Plasma drift estimates from the Dynasonde: comparison with EISCAT measurements |
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| Authors: | K J F Sedgemore J W Wright P J S Williams G O L Jones M T Rietveld |
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| Institution: | (1) Prifysgol Cymru Aberystwyth, Ceredigion, SY23 3BZ, Wales;(2) British Antarctic Survey, NERC, High Cross, Madingley Rd., Cambridge, CB3 OET, England;(3) EISCAT Scientific Association, Ramfjordmoen, Tromsdaten, N-9020, Norway;(4) Present address: Dept. Physics, University of Southampton, Highfield, S017 1BJ, UK |
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| 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. |
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| Keywords: | Auroral ionosphere Plasma convection Instruments and techniques |
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