Symmetric (planar, cylindrical, and spherical) models of microwave discharg
es in air are considered assuming that the deposited energy is removed via
heat conduction. The characteristic features of spherical discharges are an
alyzed in detail, and the conditions for discharge stability are examined.
It is shown that discharges in the low-temperature (unstable) state can be
stabilized by varying the power of a feedback-controlled microwave source;
(C) 2000 MAIK "Nauka/Interperiodica".