TEMPORAL SPECTRUM OF INTERPLANETARY SCINTILLATION IN THE NEAR-SUN REGION

The theory of the scintillation temporal power spectrum and two freque ncy co-spectrum for radio waves propagating through the near-Sun inter planetary plasma is considered. The relative contributions of the regu lar motion, turbulent velocity fluctuations and turbulent wave propaga tion are discussed. The comparison of theory and the known observation al data indicates that for distances r < 10R., velocity fluctuations d ue to large scale Alfvenic waves are most important. For distances 10R . less than or equal to r less than or equal to 40R., the temporal spe ctrum is determined by the solar wind motion and slow magnetosonic wav e propagation.