ON THE ORIGIN AND CLIMATOLOGY OF NOCTILUCENT CLOUDS
AIR WEATHER SERVICE SCOTT AFB IL
Pagination or Media Count:
A review is made of the existing concepts of the constitution or origin of the clouds, and a mechanism is suggested which might explain their apparent dependence on latitude. Their frequency of occurrence with respect to latitude, longitude, time of year, and other factors, is analyzed in detail. Year-by-year changes in the number of occurrences are considered in relation to the 11-year sunspot cycle. A comprehensive sample of data on cloud movement is summarized, although in view of the highly complicated field of motion in noctilucent clouds, this subject is difficult to treat satisfactorily. A comparison is made of rocket samples of particle size and concentration with values deduced from polarization measurements.