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In the previous paper (pp. 455-62 of the present issue) the authors have shown that the total ionospheric absorption of cosmic noise at 286 MHz can be expressed as a sum of three contributions: from the F2 layer (including topside ionosphere), from the D and E layers, and from abnormal phenomena such as spread-F; and can be given by the expression

Short Communications: A Method of Obtaining the Mean Electron Collision Frequencies in the F2 Layer from Cosmic Noise Absorption Studies