Physics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jastp..73.1616h&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 73, Issue 13, p. 1616-1628.
Physics
Scientific paper
The activity of the mesospheric-lower-thermosphere (MLT) quasi-7-day wave at two northern polar meteor-radar sites is presented. The study is based on long term meteor wind observations over Resolute Bay (75°N, 95°W) (May1998 to Feb 2009) and Yellowknife (62.5°N, 114.3°W) (June 2002 to Oct 2008). The wave showed clear seasonal variations, with strong activity during winter, more modest occurrence in the equinoxes, and minimum strengths during summer. The period of the quasi-7-day wave was 7.4±0.3 days with little to no systematic seasonal variation in the wave period. The wave was characterized by increasing amplitude with increasing height and with downward phase propagation, suggesting that the wave had its origin at lower heights. The planetary wave (PW) activity was stronger in the zonal component than in the meridional component. The PW activity shows year to year variations, and appears to be sensitive to the background wind. The possible source mechanisms for the quasi-7-day wave are briefly discussed in the light of current understanding about planetary waves.
Hocking Wayne K.
Kishore Kumar G.
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