GLOBAL-MODEL OF THE CORONA WITH HEAT AND MOMENTUM ADDITION

We have been developing a series of global coronal models directed at a better simulation of empirical coronal hole and streamer properties. In a previous study, a volumetric heat source was used to produce a t hin current sheet above streamers and high solar wind speed in the cor onal hole. This improved the preexisting coronal structure for coronal mass ejection simulations even when not using a polytropic energy equ ation. Here we report on the addition of a momentum source to the mode l with volumetric heating and thermal conduction. Most theoretical acc eleration models in coronal holes are driven either by thermal pressur e or waves (magnetosonic, Alfven, and sonic waves). In the thermal pre ssure driven models an artificially high effective temperature is assu med. In the wave driven models the force is generally not big enough t o accelerate the solar wind as quickly as observed. In the present mod el, in comparison to earlier calculations [Suess et al., 1996], we red uce the heat source and add momentum. These changes appear to further improve the numerical simulation results in comparison to empirical pr operties. We have high solar wind speed in the hole without using unre alistic high plasma temperature. We also demonstrates that the deposit ion height of the momentum addition affects the mass flux. The model s till predicts a slow-speed solar wind source in the streamer and high plasma beta at the top of the streamer.