RESEARCHES IN SOLAR PHYSICS DURING 1964.
OSLO UNIV (NORWAY) DEPT OF ASTROPHYSICS
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The structure of storm bursts in the meter wave region, and their interrelations were studied. Individual bursts in a shower appear to be independent of each other. Occasional bursts sometimes show an approach to regular periodicity, but irregular distributions of bursts are more common. Studies of the band 310 - 340 mc showed very few bursts which might be ascribed to a solar origin. A comparison of meter wave observations of the sun at Oslo with NERA The Netherlands and Tokyo indicates that the Oslo data have a high degree of reliability and stability, even over a 10 year period. Some progress is reported in a study of the new type of bursts named flash-bursts. A study of the lifetime of sunspot groups and of magnetic properties of sunspot groups led to the discovery of several new tendencies of the sun to display secular variations, different from one cycle to the next. The transparency properties of sunspot models are discussed. Some current models fail to stand up to the test in this respect. The continuation of Maltbys work on Evershed effect and wiggles was continued with fair success, in spite of the low solar activity. In this connection Brahde made a theoretical study of the instrumental width of spectral lines taken with the large spectrograph of the solar tower. Author