Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.1735j&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 1, 1985, p. 1735-1743.
Physics
9
Auroral Zones, Geomagnetism, Magnetic Disturbances, Mesopause, Solar Terrestrial Interactions, Magnetoactivity, Power Spectra, Stratosphere, Tropospheric Waves, Wind Effects
Scientific paper
Neutral winds at 86 km obtained by the mesosphere-stratosphere-troposphere (MST) radar at Poker Flat, Alaska during June and July of 1980-1982 have been spectrally analyzed for evidence of changes in the neutral wind spectrum related to geomagnetic activity. Average zonal and meridional power spectra were found to be constant from year to year at periods shorter than about eight hours. The high-frequency portion of the gravity wave regime appears quite constant with no apparent correlation with local electrojet activity. Qualitative differences in the average power spectra for geomagnetically active and quiet periods at low frequencies are apparent, especially in the meridional component. The low-frequency regime is dominated by diurnal and semi-diurnal fluctuations whose amplitude is quite variable.
Johnson Mark R.
Luhmann Janet G.
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