Astrophysics and Space Science

, Volume 179, Issue 2, pp 237-248

Speed-resonance in space: General concept and realization conditions

  • V. P. VasilyevAffiliated withInstitute of Radio Astronomy, Academy of Sciences of the Ukranian SSR

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A new class of non-stationary phenomena in the spatial-modulated interaction of the cosmic radiation with absorptive matter is discussed. Peculiarity of these phenomena is caused by dynamic regeneration of longitudinal compression waves by scanning nonuniformities of external radiative heating, for the case when the propagation velocity of oscillations excited by hem is close to the scanning velocity, i.e., the speed-resonance occurs. Before the speed-resonance pumping saturation level is attained, such a radiation-wave echo probably transforms into a set of shock waves, for excitation of which much more powerful sources are required provided that the energy release is of pulsing type. In its turn, dissipation of the shock waves, turbulization of matter and local changes of its radiative balance can stimulate various instabilities and can result finally in observable non-stationary even in stationarily irradiated objects. Necessary conditions for the speed-resonance realization exist, at least, in atmospheres of the Earth and Mars (a terminator version), Jupiter and Saturn (an eclipse version), multiple star systems (terminator, eclipse and ray versions), as well as in diffuse matter (eclipse, ray, and sail versions). It cannot be excluded that the speed-resonance concept can be expanded to other types of sources and the waves generated by them.