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We investigate, by experiments and numerical simulations, thermal activationprocesses of Josephson tunnel junctions in the presence of microwave radiation.When the applied signal resonates with the Josephson plasma frequencyoscillations, the switching current may become multi-valued temperature rangesboth below and above the the classical to quantum crossover temperature.Switching current distributions are obtained both experimentally andnumerically at temperatures both near and far above the quantum crossovertemperature. Plots of the switching currents traced as a function of theapplied signal frequency show very good agreement with a simple anharmonictheory for Josephson resonance frequency as a function of bias current.Throughout, experimental results and direct numerical simulations of thecorresponding thermally driven classical Josephson junction model show verygood agreement.

Anomalous Thermal Escape in Josephson Systems Perturbed by Microwaves