Temperature dependence of electric and magnetic gluon condensates.

The contribution of Lorentz nonscalar operators to finite temperature correlation functions is discussed. Using the local duality approach for the one-pion matrix element of a product of two vector currents, the temperature dependence of the average gluonic stress tensor is estimated in the chiral limit to be [l angle][bold E][sup 2]+[bold B][sup 2][r angle][sub [ital T]]=([pi][sup 2]/10)[ital bT][sup 4]. At a normalization point [mu]=0.5 GeV we obtain [ital b][approx]1.1. Together with the known temperature dependence of the Lorentz scalar gluon condensate we are able to infer [l angle][bold E][sup 2][r angle][sub [ital T]] and [l angle][bold B][sup 2][r angle][sub [ital T]] separately in the low-temperature hadronic phase.