
TY  - JOUR
A1  - Wild, JP 
A1  - McCready, LL 
T1  - Observatioas of the Spectrum of High-Intensity Solar Radiation at Metre Wavelengths. I. The Apparatus and Spectral Types of Solar Burst Observed
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1950
VL  - 3
IS  - 3
SP  - 387
EP  - 398
KW  - 
UR  - https://doi.org/10.1071/CH9500387 
N2  - An apparatus for recording the dynamic spectrum of high-intensity solar radiation (in particular the sudden bursts) in the frequency range 70-130 Mc/s. is described. The spectra are displayed on a cathode-ray tube at intervals of about one-third of a second.     Solar bursts observed with the apparatus were found to have widely different spectra. However, analysis of a number of bursts indicated the common occurrence of three distinct spectral types. These types are described and illustrated by samples. One type, of narrow bandwidth, was exhibited by short-lived bursts that occur in large numbers during periods of high intensity ( ?noise storms?) ; these bursts are presumed to be circularly polarized and associated with sunspots. A second type, characterized by a slow drift of spectral features towards the lower frequencies, was exhibited by sporadic &quot; outbursts &quot; associated with solar flares. Other sporadic bursts had diverse spectra, but some of them conformed to a third spectral type in which the frequency of maximum intensity drifts rapidly towards the lower frequencies.     The result that outbursts seem to exhibit a distinct type of spectrum is considered to provide a possible means of recognizing these phenomena with certainty. 
ER  -

