Abstract
The solar wind in the heliosphere is a variable phenomenon on all spatial and time scales. It has been shown that there are two basic types of solar wind by the Strouhal number S = L/VT, which characterizes relative variations in the main parameters of the solar wind on the given time interval T and linear scale L for velocity V, which is never zero. The first type is transient (S > 1), which is usually the basic type for sufficiently small values of T and large values of L. The second type is quasi-stationary, when 1 > S > 0. The constant solar wind is nonexistent. The extreme case of S = 0 is physically impossible, as is the case of S = ∞. It is always necessary to indicate and justify the range of applicability for a special quasi-stationary case 1 ≫ S > 0. Otherwise, to consider the case of S = 0 is incorrect. Regarding this, the widely-spread views on the stationary state of the solar wind are very conditional. They either lack physical sense, or have a very limited range of applicability for time T and scale L.
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Original Russian Text © I.S. Veselovskii, 2017, published in Astronomicheskii Vestnik, 2017, Vol. 51, No. 3, pp. 269–272.
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Veselovskii, I.S. Variable solar wind. Sol Syst Res 51, 245–247 (2017). https://doi.org/10.1134/S0038094617030078
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DOI: https://doi.org/10.1134/S0038094617030078