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Some Influence of the Meteorological Conditions on the Atmospheric Electric Potential Gradient (Part 1) (Effects due to Wind)
It is well-known that potential gradient of atmospheric electricity can be affected by the meteorological conditions.
The writer has investigated these influences， and at first the influence of wind on the potential gradient are reported in this article. The utilized data are the potential gradient，the wind-directions and wind-velocities observed simultaneously at the Memambetsu Magnetic Observatory from Feb. to Sept., 1950. The hourly deviations of observed potential gradient from the corresponding normal values are classified into 16 classes by the wind directions. The results are as follows:
(i) The characteristics due to the wind-direction appears more clearly in Winter season than in Summer season.
(ii) To Winter season，the excessively high values are observed in the WSW wind-direction and the excessively low values in the NNW direction. In other directions particular natures are not shown. It may be considered that the former excellent value is due to the smoke coming from the Memambetsu town and later one due to the fresh hair coming over the Lake Abashiri.
(iii) In Summer season， slightly excellent values are shown in WSW direction only，but in the other direction doesn't appear any particular effect. This may be explainable by considering the other disturbance due to the distribution of wind-direction and the surrounding field near the observing station in this season.
（iv) The relation between the above-mentioned values of potential gradient and the wind-velocity are investigated， and we obtained that there is a decreasing tendency of potential gradient accompanied with the increasing of wind-velocity. This tendency is very remarkable in Winter compared with that in Summer.
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