The entanglement between two dipole-coupled identical two-level atoms resonantly interacting with one-mode thermal field in lossless cavity has been investigated. The dependence of dipole strength on the degree of entanglement has been carried out for different pure and mixed atomic states.

In the present paper the entanglement of two atoms with dipole interaction induced by two-mode thermal field in ideal cavity has been investigated. The exact analytical formula for evolution operator of system considered has been derived. On its basis the Peres-Horodetski entanglement parameter has been calculated. It has been shown that, despite the destructive nature of thermal noise, dipole interaction leads to a high degree of atomic entanglement.