Wintertime survey of LF field strengths in Japan



[1] A nationwide survey for measuring field strengths at 40 and 60 kHz was carried out in the winter months of 2004 to estimate the service area of the standard frequency and time signals. The data obtained were analyzed in comparison with the resultant field strengths of sky waves and the ground wave which were predicted using a method developed by one of the authors. Good agreement was seen between the measured and predicted field strengths.