Plasma drift estimates from the Dynasonde: comparison with EISCAT measurements

Autor: K. J. F. Sedgemore, J. W. Wright, P. J. S. Williams, G. O. L. Jones, M. T. Rietveld
Jazyk: angličtina
Rok vydání: 1998
Předmět:
Zdroj: Annales Geophysicae, Vol 16, Pp 1138-1143 (1998)
Druh dokumentu: article
ISSN: 0992-7689
1432-0576
DOI: 10.1007/s00585-998-1138-y
Popis: 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
Databáze: Directory of Open Access Journals
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