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а в Fig. в. I o n ization density distribution over Millstone Hill: a -obtained here, d - experimentally obtained according to Roble et. al.{1978). Pig. 9. The same as in Pig.в but for Arecibo. APPENDIX. H o r i z ontally propagating s o litary waves i n the neutral component of the ionospheric plasma. It is assumed that the neutral component of the ionospheric plasma is described by macroscopic equations of h y d r o d ynamics i n wh i c h the Coryolie forces, the ion drag, and v i scosity are a c counted and the gas is considered to be isoentropic. Then + div t p v ) = 0 , (4) P + - p ( v - v ) v = - v p + p q , 4t~ i - p r ) = °> where p is density, v - velocity, p - pressure, 5 “ the intensity of the gravitational field, r = cp /cv is the specific heat ratio,d/dt - d/3t+ (v ?}■ Let us suppose that we know fr o m the mo d e l the vertical distribution of. the temperature TQ (z) an d the m a s s of the n eutral component m(z) for the unperturbed state. Us i n g the rel a t i o n p = K p T / m an d the hydrostatical equation, consequence of (4)s 99