Abstract
The origination of ultrafine hot loops in the chromosphere and certain additional properties of these loops, which have not yet been found in the observational data, were studied. It was shown that the plasma in such loops can be heated to coronal temperatures owing to the dissipation of electric currents generated within tubes by photospheric convection and that the plasma density in such tubes should be substantially lower than the density in the surrounding chromosphere. The eigenfrequencies of oscillations of an ultrafine magnetic loop as an equivalent electric circuit were estimated. A possible cause of hot plasma ejections from loop footpoints is indicated.
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