Abstract
Among the variety of problems arising from attenuating influences on the propagation of waves, three will be reviewed: (a) determination of the correct gas‐kinetic description of collisions between the plasma particles and their relation to the conductivity tensor and the dispersion equation, (b) the generalization of the basic laws of geometric optics for moderate collisional absorption, and (c) the calculation of wave‐mode attenuation arising from linear‐mode coupling in a full‐wave theory for a cold, stratified, magnetized absorbing plasma.

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