Open AccessSOLAR RADIO NOISE OF 200 MC/S., AND ITS RELATlON TO SOLAR OBSERVATIONS
Author(s) -
C. W. Allen
Publication year - 1948
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1948.tb02938.x
Subject(s) - solar flare , sunspot , noise (video) , physics , geomagnetic storm , solar radio , solar minimum , earth's magnetic field , coronal mass ejection , solar cycle 22 , flare , atmospheric sciences , meteorology , astrophysics , astronomy , solar cycle , solar wind , magnetic field , quantum mechanics , artificial intelligence , computer science , image (mathematics)
Summary The solar radio‐noise observing programme on Mount Stromlo is described. Daily means of ( a ) steady flux, and ( b ) number of bursts per hour have been plotted against sunspot and geomagnetic data. Both flux level and burst frequency increase during a solar radio‐noise storm, and both are closely related to the central meridian passage of sunspots. However, some large sunspot groups do not produce solar noise. No close relation has been, found between the emission from the Sun of ( a ) radio noise, and ( b ) those particles which produce geomagnetic storms. No close correlation has been found between short period radio‐noise phenomena and solar observations, but there are occasional outbursts of solar noise accompanying the commencements of flares. It is suggested that the noise source is located rather high in the corona. The observation of a noise outburst caused by a flare 37° from the main spot group can be explained if the source is more than 120,000ms. above the Sun's surface. Physical arguments lead to a similar height.