Plasma drift estimates from the Dynasonde: comparison with EISCAT measurements

• Main Authors: Sedgemore, K. J. F., Wright, J. W., Williams, P. J. S., Jones, G. O. L., Rietveld, M. T.
• Other Authors: Prifysgol Cymru Aberystwyth, Ceredigion, British Antarctic Survey (BAS), Natural Environment Research Council (NERC), EISCAT Scientific Association
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 1998
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; Tromsø; EISCAT
• Online Access: https://hal.science/hal-00316441; https://hal.science/hal-00316441/document; https://hal.science/hal-00316441/file/angeo-16-1138-1998.pdf

International audience 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.