A NEW APPROACH TO DETERMINE LOCAL MRAMETERS OF INTERPLANETARY SIMULATED MHD SHOCKS

Firstly it is accounted for the validity of the hypothesis that interplanetary MHD shocks can be treated as locally planar with no thicklless when analyzing their Iocal properties, and the fact is demoastrated that the variatious of the physical quantities can be ignored in the area where no shock perturbs （in the upper reach of the shock） within a few hours. Then making use of the method to analyze planar MHD shocks. In doing so, a new approach is deveoped to detedrie local parameters of interplanetary simmulated MHD shocks. The proposed approach includes defining the location of the shock, selecting the state parameters in the upper and lower reaches of the shock, computing the shock’s local parameters, and classifying the shock according to its upstream and downstream Alfevn Mach numbers. Finally, the proposed method is used to deal with the result of a two-dimensional MHD simulation. The analyses confirm the linkage law of hybrid MHD shocks’ spatial connection and temporal evolution in the past reference and reveal that the slow and intermediate shocks near the solar equator finally evolve into fast shocks during their outward propagation.