. Bell telephone magazine . is believedthat readers of the Quarterly willbe interested in a discussion of thecauses of such storms and some in-formation about the March 24 storm,particularly as it affected Bell Systemservices. The underlying cause of the mag-netic and electrical disturbances on1 the earth probably resides in disturb- ances in solar activity, of which sunspots are perhaps only one manifesta-tion. This has become evident as aresult of a great amount of data takenover a long period of years. Thesedata show a correlation between solaractivity, as revealed by the sun spots,and the
. Bell telephone magazine . is believedthat readers of the Quarterly willbe interested in a discussion of thecauses of such storms and some in-formation about the March 24 storm,particularly as it affected Bell Systemservices. The underlying cause of the mag-netic and electrical disturbances on1 the earth probably resides in disturb- ances in solar activity, of which sunspots are perhaps only one manifesta-tion. This has become evident as aresult of a great amount of data takenover a long period of years. Thesedata show a correlation between solaractivity, as revealed by the sun spots,and the occurrence and intensity ofpolar lights and electrical and mag-netic disturbances on earth. In thisconnection, Figure 1 shows the an-nual mean of relative sun spot num-bers and the annual mean magneticactivity from 1835 to 1939.* The * The magnetic activity is measured by anindex that depends on the day-to-day changeof the mean horizontal intensity of the earthsmagnetic field. saDueqjn^siQ uoissioisuejLOipeao o o — 0£6I. _: CJ o o 1 w SJaqaTnN :;odsuns SAi^^epy 1 i9^0 Sun Spots and Telephone Service 187 80 60 40 20 ^ 53 O 0) u (20 100 Earth CurrentVariations
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
