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Spatial coherence of thermal fields in far- and near-field zones generated byheated half-space into vacuum is studied at essentially differentthermodynamical conditions. It is shown that correlation lengths of fields inany field zone are different in equilibrium and out of equilibrium systems. Inwide range of distances from sample surface correlation functions are should becalculated using a total sum of evanescent and propagating contributions due totheir mutual compensation at some conditions because of anticorrelations. It isdemonstrated that correlation lengths as calculated with a proposed formula arein agreement with a behavior of correlation functions of thermal fields inspectral range of surface excitations

On correlation lengths of thermal electromagnetic fields in equilibrium and out of equilibrium conditions