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Planetary and tidal wave activity in the tropopause-lower stratosphere andmesosphere-lower thermosphere (MLT) is studied using combinations ofground-based (GB) and satellite instruments (2000-2002). The relatively new MFR(medium frequency radar) at Platteville (40° N, 105° W) has providedthe opportunity to create an operational network of middle-latitude MFRs,stretching from 81° W-142° E, which provides winds and tides 70-100km.CUJO (Canada U.S. Japan Opportunity) comprises systems at London (43° N,81° W), Platteville (40° N, 105° W),Saskatoon (52° N, 107° W), Wakkanai (45° N, 142° E) and Yamagawa (31° N, 131° E). Itoffers a significant 7000-km longitudinal sector in the NorthAmerican-Pacific region, and a useful range of latitudes (12-14°) at twolongitudes. Satellite data mainly involve the daily values of the totalozone column measured by the Earth Probe (EP) TOMS (Total Ozone MappingSpectrometer) and provide a measure of tropopause-lower stratosphericplanetary wave activity, as well as ozone variability.<P  style="line-height: 20px;">Climatologies of ozone and winds/tides involving frequency versus time(wavelet) contour plots for periods from 2-d to 30-d and the interval frommid 2000 to 2002, show that the changes with altitude, longitude andlatitude are very significant and distinctive. Geometric-mean wavelets forthe region of the 40° N MFRs demonstrate occasions during the autumn,winter and spring months when there are similarities in the spectralfeatures of the lower atmosphere and at mesopause (85km) heights. Bothdirect planetary wave (PW) propagation into the MLT, nonlinear PW-tideinteractions, and disturbances in MLT tides associated with fluctuations inthe ozone forcing are considered to be possible coupling processes. Thecomplex horizontal wave numbers of the longer period oscillations areprovided in frequency contour plots for the TOMS satellite data todemonstrate the differences between lower atmospheric and MLT wave motionsand their directions of propagation

annales geophysicae

Wave activity (planetary, tidal) throughout the middle atmosphere (20-100km) over the CUJO network: Satellite (TOMS) and Medium Frequency (MF) radar observations