Abstract
Atmospheric disturbances have been observed monthly at the Shuang-Chiao Radio Station for one complete year. Here are described the measuring apparata, the method of measurements, and the results of observations. Conclusions obtained are as follows:
a) It is believed that the wave-length of atmospherics is generally longer than that of long wave for transoceanic communications.
b) Generally, atmospherics are stronger during night than during daytime. In summer season, however, atmospheric centres are caused in the vicinity of this district and they frequently become stronger in the afternoon than at night.
c) The quantity and strength of atmospherics are not coexistent all the time; sometimes stronger clicks come from a direction of smaller quantity.
d) Directions of atmospheri s vary not only according to seasons but also according to hours, and they have a close connection to the position of the sun.
e) Directions of atmospherics become uncertain in summer season, but they point to south (or south-east) in other seasons. During winter nights, however, comparatively strong grinders come often from western or southwestern direction.
f) Monthly averages of di ections have a tendency to move from south to west according to the rise of temperature, but the average directions in winter season incline to south-west.
g) If a unidirectional antenna system is used at this station, about 40% reduction of atmospherics is attained for receiving Bolinas Station, and 30% for receiving European Stations.
