Abstract
The characteristics of the tropical cloudiness on the equatorial cloud band of the northern hemisphere were investigated by using the SSCC pictures recorded by NASA from January 1 to June 30 in 1967. The cloudiness variation with approximately semi-monthly period was predominantly detected from the spectrum analysis. This variation is expected to be deviled into three wave modes from rough analysis of wave propagation, one of which travels eastwards, others of which propagate westwards.
