Comparison and interpretation of the results of simultaneous wind measurements in the lower thermosphere at Garchy (France) and Obninsk (U.S.S.R.) by meteor radar technique

Glass, M.; Fellous, Jean-Louis; Massebeuf, M.; Spizzichino, A.; Lysenko, I. A.; Portniaghin, Yu.I.

doi:10.1016/0021-9169(75)90153-1

Cited by 69 publications

(26 citation statements)

References 10 publications

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“…After a number of tests it turns out that the results of the mean periods are even more consistent if the cuto amplitude is increased (e.g., 15 m/s). All these results strongly suggest that the enhancement or burst of the 2-day activity occurs most frequently near a period of 46±47 h. The periods determined in the present study are therefore found to be smaller than the 51±52 h period generally suggested by the Northern Hemisphere results (e.g., Muller, 1972;Glass et al, 1975;Muller and Nelson, 1978;Kingsley et al, 1978;Stenning et al, 1978;Manson et al, 1978;Salby and Roper, 1980;Tsuda et al, 1988), although these other studies did not distinguish periods on the basis of wave amplitudes as we have.…”

Section: Periodcontrasting

confidence: 66%

“…Simultaneous meteor wind measurements at Garchy (47°N, 3°E) and Obninsk (56°N, 36°E), led Glass et al (1975) to propose that the 2-day wave was a westwardpropagating third order Rossby-gravity normal mode; the (3, 0) mode (Longuet-Higgins, 1968). This proposal was further substantiated by simultaneous observations of the 2-day wave by various investigators.…”

Section: Introductionmentioning

confidence: 90%

“…Di erent observers report somewhat di erent periods in the range 43±53 h (e.g., Craig and Elford, 1981;Kalchenko, 1987;Salby and Roper, 1980;Massebeuf et al, 1981;Cevolani et al, 1983;Tsuda et al, 1988). In the Southern summer Hemisphere the dominant wave period seems consistently to be fairly close to 48 AE 3 h (e.g., Craig et al, 1980;Craig and Elford, 1981;Phillips, 1989;Poole, 1990;Harris, 1993b), whereas in the Northern summer Hemisphere the period often seems to be 51 AE 2 hours (e.g., Muller, 1972;Glass et al, 1975;Muller and Nelson, 1978;Kingsley et al, 1978;Stenning et al, 1978;Manson et al, 1978;Salby and Roper, 1980;Tsuda et al, 1988). reported summer (June±August) values of 47±50 AE2±5 h. It is possible that these di erences are due to hemispheric di erences in the wave forcing and/or propagation conditions in the middle atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous observations of the 2-day wave at London (43°N, 81°W) and Saskatoon (52°N, 107°W) near 91 km altitude during the two years of 1993 and 1994

et al. 1997

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Abstract. Simultaneous observations are valuable in providing further insights into the character of the quasi 2-day wave. In this study we investigate the period and amplitude for the quasi 2-day wave near 91 km using MF radars at London and Saskatoon, Canada, and in addition look at possible values of the zonal wave number. The results of the present study bring out certain new aspects of the quasi 2-day wave at midlatitudes in the Northern Hemisphere. In particular we show that the period of the quasi 2-day wave determined from our study (specially at large amplitudes) is smaller (46±47 h) than the 51±52 h period often suggested by other Northern Hemisphere results, and that the periods also showed variability as a function of time. We also draw attention to the annual variability, and especially highlight the occurrence of the wave in non-summer months. Our observations show signi®cant wave correlation between the London and Saskatoon sites during time intervals of strong 2-day wave activity. These results suggest that the 2-day waves of 1993/4 are westward propagating waves of zonal wave number 3, although sometimes the zonal wave number 5 is also indicated (specially at large amplitudes). Our study also contributes additional mid-latitude geographical data which should aid in developing a better picture of the quasi 2-day wave.

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Section: Periodcontrasting

confidence: 66%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Simultaneous observations of the 2-day wave at London (43°N, 81°W) and Saskatoon (52°N, 107°W) near 91 km altitude during the two years of 1993 and 1994

et al. 1997

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“…Herein, we consider QTDWs to include those oscillations with frequencies between about 0.5±0.1 cycles day −1 or periods of 40-60 h. Since the early 1970s (Muller, 1972;Kal'chenko and Bulgakov, 1973) these waves have been revealed in mesopause wind variations at low-and mid-latitudes. Glass et al (1975) estimated the zonal wave number of this oscillation to be S=3. At present two main mechanisms have been proposed to explain the occurrence of the QTDW at levels of the mesosphere/lower thermosphere (MLT).…”

Section: Introductionmentioning

confidence: 99%

High- and mid-latitude quasi-2-day waves observed simultaneouslyby four meteor radars during summer 2000

Merzlyakov

Pancheva²,

Mitchell³

et al. 2004

Ann. Geophys.

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Abstract.Results from the analysis of MLT wind measurements at Dixon (73.5 • N, 80 • E), Esrange (68 • N, 21 • E), Castle Eaton (UK) (53 • N, 2 • W), and Obninsk (55 • N, 37 • E) during summer 2000 are presented in this paper. Using S-transform or wavelet analysis, quasi-two-day waves (QTDWs) are shown to appear simultaneously at high-and mid-latitudes and reveal themselves as several bursts of wave activity. At first this activity is preceded by a 51-53 h wave with S=3 observed mainly at mid-latitudes. After a short recess (or quiet time interval for about 10 days near day 205), we observe a regular sequence of three bursts, the strongest of them corresponding to a QTDW with a period of 47-48 h and S=4 at mid-altitudes.We hypothesize that these three bursts may be the result of constructive and destructive interference between several spectral components: a 47-48 h component with S=4; a 60-h component with S=3; and a 80-h component with S=2. The magnitudes of the lower (higher) zonal wave-number components increase (decrease) with increasing latitude. The S-transform or wavelet analysis indicates when these spectral components create the wave activity bursts and gives a range of zonal wave numbers for observed bursts from about 4 to about 2 for mid-and high-latitudes. The main spectral component at Dixon and Esrange latitudes is the 60-h oscillation with S=3. The zonal wave numbers and frequencies of the observed spectral components hint at the possible occurrence of the nonlinear interaction between the primary QTDWs and other planetary waves. Using a simple 3-D nonlinear numerical model, we attempt to simulate some of the observed features and to explain them as a consequence of the nonlinear interaction between the primary 47-48 h and the 9-10 day waves, and the resulting linear superposition of primary and secondary waves. In addition to the QTDW bursts, we also infer forcing of the 4-day wave with S=2 and the 6-7 day wave with S=1, possibly arising from nonlinear decoupling of the 60-h wave with S=3. The starting mechanism for this decoupling is the Rossby wave instability (e.g.Correspondence to: E. Merzlyakov (eugmer@typhoon.obninsk.org) Baines, 1976). This result is consistent with the day-to-day wind variability during the observed QTDW events. An interesting feature of the final stage of the observed QTDW activity in summer 2000 is the occurrence of strong 4-5 day waves with S=3.

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“…These waves are observed at various observatories and their characteristics have been revealed (e.g., GLASS et al, 1975;MULLER and NELSON, 1978;CRAIG and ELFORD, 1981;CRAIG et al, 1983;ITO et al, 1984;TSUDA et al, 1988). For instance, these waves have a global scale, travel westward with a longitudinal wavenumber of three and have fairly long vertical wavelengths of approximately 100 km.…”

Section: Introductionmentioning

confidence: 99%

Quasi two-day period variation of the geomagnetic field.

Takeda

Yamada

1989

J. geomagn. geoelec

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A quasi two-day variation is determined from SdI in the geomagnetic field in the interval from May to August, 1958. Two peaks are found in the power spectrum at 45 and 58 hours in period. The amplitude of the 58 hour period variation increases with geographic latitude and the phase is almost the same at the observatories used in both hemispheres. A calculation of the geomagnetic field variation from winds antisymmetric with the geographic equator reproduces the observed distribution of the amplitude. However, the calculation shows that the phase is the same in both hemispheres except that it is reversed at certain meridians, while the observational results indicate the same phase everywhere.

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Comparison and interpretation of the results of simultaneous wind measurements in the lower thermosphere at Garchy (France) and Obninsk (U.S.S.R.) by meteor radar technique

Cited by 69 publications

References 10 publications

Simultaneous observations of the 2-day wave at London (43°N, 81°W) and Saskatoon (52°N, 107°W) near 91 km altitude during the two years of 1993 and 1994

Simultaneous observations of the 2-day wave at London (43°N, 81°W) and Saskatoon (52°N, 107°W) near 91 km altitude during the two years of 1993 and 1994

High- and mid-latitude quasi-2-day waves observed simultaneouslyby four meteor radars during summer 2000

Quasi two-day period variation of the geomagnetic field.

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