OCR Text |
Show How Sun Determines Volume on Long Waves That the sun's activity is probably Ihe chief factor in determining the strengih of long-wave radio signals was the most important conclusion in Hie annual report of the laboratory for special radio transmission re-search re-search prepared by Dr. I.. W. Austin, of the bureau of standards. In addition to the curves and tables showing the routine measurements f Ihe laboratory, curves were shown in the report which indicate a close relationship re-lationship between the long-wave sig-nal sig-nal strength and Ihe changes in Hum- 1 her of sun spots dining the eleven- ; year sun spot cy, le, the signals in- j creasing in strength with n. increase of sun spots. HI her curves given show periodic i changes in Ihe signals during the time ; of the sun s relation (twenty six , days), while others Indicate a nine-ihiy nine-ihiy period In the casv of certain si ,. ' lions. Some of Iho -e ni 'vos also suggest lived active areas on ihe sun, which oh. -ii produce Increase In signal strength v. hen fhey fa.v H. ,.:m, . Thc-e periodic relaMoeslii.s, however, are not considered as well established as ihe relation. hip ,,f Hie monthly and yearly average of sun sp.us and sig luils eMending over a number ,' f years. |