A COMPARISON BETWEEN AN ION-CYCLOTRON RESONANCE MODEL FOR HEATING ANDACCELERATION OF THE SOLAR WIND AND THE OBSERVATIONS ON THE SOLAR POLARCORONA HOLE BY UVCS ON SOHO

A set of equations are developed for describing the spatial evolution in the polarcorona of anisotropic multi-ion-nuid properties based on the heating and acceleration by ion-cyclotron resonance. Numerical solutions of this equation set are usedto make a comparison with the recent observations by UVCS on SOHO(Kohl etal. 1998). If we assume that the spectrum of the cyclotron waves has a fixed slop, -2, themodel results can describe the UVCS observations for Helium(assuming for protons also)and for either the bulk speed of O+5 ions or the effective perpendicular thermal speed ofO+5 ions respectively if further assuming different amplitude of the waves. However we cannot describe both speeds with single wave amplitude. It is suggested that the fixed spectrumslope assumption, which is widely used in the study of this topic, may not describe the realsituation in corona.