Abstract
Wave heating in the interior of supergranulation cells is reviewed and it is suggested that the bright points may be heated by pulses and by oscillations in their wakes with periods near 3 min, the acoustic cutoff period in the upper photosphere. Such waves create propagation channels by the amplification of vertically travelling waves and by focussing for wave periods near the cutoff period. The middle chromosphere is heated by shock dissipation, but the low chromosphere may partly be heated also by radiative energy transport down from the higher layers.
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