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National Repository of Grey Literature

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Seasonal Variation in Propagation Directions of Acoustic Gravity Waves in the Thermosphere Fišer, Jiří ; Chum, Jaroslav We investigate seasonal behaviour of acoustic gravity waves (AGWs) in\nthe thermosphere. For this purpose, measurements of HF Doppler sounding stations\noperated by or in cooperation with our institute are used. These measurements\nare compared with previously reported studies which employed different techniques\nof ionospheric observations. The propagation of AGWs is found to have strong\nseasonal dependence. AGWs in summer generally tend to propagate poleward in\nsummer and equatorward in winter. Detailed record

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