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Abbravation: Annales Geophysicae

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Copernicus GmbH

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10.1016/0375-9601(95)00210-t

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0992-7689

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Simultaneous observations of the 2day wave at Lon

Authors: Thayaparan T Hocking W K MacDougall J Manson A H Meek C E
Publish Date: 1997/10/31
Volume: 15, Issue: 10, Pages: 1324-1339
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Abstract

Abstract Simultaneous observations are valuable in providing further insights into the character of the quasi 2day wave In this study we investigate the period and amplitude for the quasi 2day 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 2day wave at midlatitudes in the Northern Hemisphere In particular we show that the period of the quasi 2day 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 nonsummer months Our observations show significant wave correlation between the London and Saskatoon sites during time intervals of strong 2day wave activity These results suggest that the 2day 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 midlatitude geographical data which should aid in developing a better picture of the quasi 2day wave


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