Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mercu...7...23p&link_type=abstract
Mercury, vol. 7, Mar.-Apr. 1978, p. 23-26, 33.
Physics
Solar Activity, Solar Magnetic Field, Solar Physics, Auroras, Faculae, Solar Corona, Solar Flares, Solar Neutrinos, Solar Radiation, Sunspots
Scientific paper
The current state of knowledge regarding the sun and the processes taking place in it is examined. It is found that in addition to the neutrino problem there are many other intriguing problems. Recent observations represent a challenge with respect to basic theoretical interpretations of solar phenomena. Elementary facts about the sun are considered, taking into account the significance of the presence of sunspots with their very strong magnetic fields, flares, auroras, faculae, and the differential rotation of the sun. A description is presented of a theory which explains the high temperatures of the chromosphere and the corona. Investigations based on observations of radio waves, infrared and ultraviolet radiation, and X-rays are considered. Attention is also given to holes in the solar corona, quiescent periods in solar activity, and problems related to an occurrence of 'Maunder minima'.
Pallavicini Roberto
Poletto Giannina
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