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The heating of solar chromospheric inter-network regions by means of theabsorption of electromagnetic (EM) waves that originate from the photosphericblackbody radiation is studied in the framework of a plasma slab model. Theabsorption is provided by the electron-neutral collisions in which electronsoscillate in the EM wave field and electron-neutral collisions damp the EMwave. Given the uncertain nature of the collision cross-section due to theplasma micro-turbulence, it is shown that for plausible physical parameters,the heating flux produced by the absorption of EM waves in the chromosphere isbetween $20 - 45$ % of the chromospheric radiative loss flux requirement. It isalso established that there is an optimal value for the collisioncross-section, $5 \times 10^{-18}$ m$^{2}$, that produces the maximal heatingflux of 1990 W m$^{-2}$.

Heating of solar chromosphere by electromagnetic wave absorption in a plasma slab model