Abstract
The nonlocal character of the radiation field sianificantly modifies the radiative damping of perturbations in the solar photosphere. Gravity waves are not usually considered to exist in the solar photosphere because the radiative damping time, when based on the Newtonian approximation, is too short. However, this restriction does not apply to low order gravity waves. In fact, with the inclusion of nonlocal effects, the radiative damping for low order gravity waves becomes negative for some region in the photosphere and thus acts as a driving mechanism for gravity waves there.
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Logan, J.D., Hill, H.A. Radiative damping of gravity waves in the solar atmosphere. Space Sci Rev 27, 301–306 (1980). https://doi.org/10.1007/BF00168312
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DOI: https://doi.org/10.1007/BF00168312