The summertime 12-h wind oscillation with zonal wavenumber s = 1 in the lower thermosphere over the South Pole

Details The summertime 12-h wind oscillation with zonal wavenumber s = 1 in the lower thermosphere over the South Pole The summertime 12-h wind oscillation with zonal wavenumber s = 1 in the lower thermosphere over the South Pole

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998angeo..16..828p&link_type=abstract

Annales Geophysicae, vol. 16, Issue 7, pp.828-837

Mathematics

Logic

43

Scientific paper

Meteor radar measurements of winds near 95 km in four azimuth directions from the geographic South Pole are analyzed to reveal characteristics of the 12-h oscillation with zonal wavenumber one (s=1). The wind measurements are confined to the periods from 19 January 1995 through 26 January 1996 and from 21 November 1996 through 27 January 1997. The 12-h s=1 oscillation is found to be a predominantly summertime phenomenon, and is replaced in winter by a spectrum of oscillations with periods between 6 and 11.5 h. Both summers are characterized by minimum amplitudes (5-10 ms-1) during early January and maxima (15-20 ms-1) in November and late January. For 10-day means of the 12-h oscillation, smooth evolutions of phase of order 4-6 h occur during the course of the summer. In addition, there is considerable day-to-day variability (+/-5-10 ms-1 in amplitude) with distinct periods (i.e., ~5 days and ~8 days) which suggests modulation by planetary-scale disturbances. A comparison of climatological data from Scott Base, Molodezhnaya, and Mawson stations suggests that the 12-h oscillation near 78°S is s=1, but that at 68°S there is probably a mixture between s=1 and other zonal wavenumber oscillations (most probably s=2). The mechanism responsible for the existence of the 12-h s=1 oscillation has not yet been identified. Possible origins discussed herein include in situ excitation, nonlinear interaction between the migrating semidiurnal tide and a stationary s=1 feature, and thermal excitation in the troposphere.

Affiliated with

Also associated with

No associations

Rating

The summertime 12-h wind oscillation with zonal wavenumber s = 1 in the lower thermosphere over the South Pole does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The summertime 12-h wind oscillation with zonal wavenumber s = 1 in the lower thermosphere over the South Pole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The summertime 12-h wind oscillation with zonal wavenumber s = 1 in the lower thermosphere over the South Pole will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1342447