. Compendium of meteorology. Meteorology. SOUND PROPAGATION IN THE ATMOSPHERE 373 Annual changes in the travel-time curves (Fig. 12), and the annual period of the radius of the zone of abnormal audibility, are caused by (1) annual changes 250 â 150 :oo 50 â IAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR ^MAXIMUM I I INTENSITY (â¢). Fig. 10.âYearly period of the distance from the source at which the first ring of audibilitj- begins (circles and thin curve) and of the distance of the maximum number of reported obser- vations (dots and thick curve) based on data collected by Wegener
. Compendium of meteorology. Meteorology. SOUND PROPAGATION IN THE ATMOSPHERE 373 Annual changes in the travel-time curves (Fig. 12), and the annual period of the radius of the zone of abnormal audibility, are caused by (1) annual changes 250 â 150 :oo 50 â IAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR ^MAXIMUM I I INTENSITY (â¢). Fig. 10.âYearly period of the distance from the source at which the first ring of audibilitj- begins (circles and thin curve) and of the distance of the maximum number of reported obser- vations (dots and thick curve) based on data collected by Wegener [28, 29]. in the speed and direction of the wind, or (2) an increase in temperature above the value near the ground at ele- vations varying, in central Europe, between about 30 km in late winter and 40 km in late summer. Either (1) (a) ' 2 SEC.' ALIENLUNNE 98,43 km UFFELN 128,75 km. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Meteorological Society. Committee on the Compendium of Meteorology; Malone, Thomas F. Boston : American Meteorological Society
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