The influence of geomagnetic activity on the upper mesosphere/lower thermosphere in the auroral zone. II - Horizontal winds

Details The influence of geomagnetic activity on the upper mesosphere/lower thermosphere in the auroral zone. II - Horizontal winds The influence of geomagnetic activity on the upper mesosphere/lower thermosphere in the auroral zone. II - Horizontal winds

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..923p&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 53, Oct. 1991, p. 923-947. Research supported by Australia

Physics

8

Atmospheric Physics, D Region, Geomagnetism, Magnetic Effects, Mesosphere, Radar Measurement, Winds Aloft, Annual Variations, Radar Echoes, Wind Direction, Wind Variations

Scientific paper

A spaced antenna partial reflection radar located at Mawson, Antarctica (67 deg S, 63 deg E, invariant latitude 70 deg S), has been used to measure the horizontal wind field in the height range 70-110 km. Three years of data (1985-1987) from the radar have been analyzed in order to investigate correlations between geomagnetic activity (determined from the local K-index) and the horizontal wind. Results are analyzed using a randomization technique and show that larger winds are measured during geomagnetically active periods in both the raw (or unfiltered) wing values and in the medium-frequency (2-6 h period) and high-frequency (1-3 h period) components. The raw winds tend to be shifted toward the geographic NW to NE quadrant in the early morning hours during high K-times. The observed correlation is seen down to 86 km and shows a seasonal dependence. The mean rms velocity of the radar scatterers and the angular spread of the return echoes are also found to be correlated with geomagnetic activity.

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