Relationship of cosmic ray diurnal anisotropy and high speed solar wind streams.

It is accepted that high speed solar wind streams originated from the sun can he identified into two categories .the coronal hole associated or corotating streams (CS) and flare-generated streams.In this analysis, we examine the effects of these two types of solar wind streams on diurnal anisotropy of cosmic ray daily variation for the period of 1980-1982 Amplitudes and time of maxima (Phases) of diurnal vectors have been obtained from harmonic analysis, using the hourly counts of Deep River neutron monitor.The daily vectors have been obtained for the intervals, before, during and after each event of high speed solar wind streams on the basis of chrcc and vector addition analysis It has been found that the solar flare-generated high speed solar wind streams are most effective to produce isotropic and anisotropic changes in cosmic Tay intensity.We observe relatively smaller amplitude of the diurnal anisotropy during the period of flare-generated streams.