Magnetic cloud B-s events and their dependence on cloud parameters

It had been found that the duration and intensity of the southward interpla netary magnetic field within magnetic clouds (the magnetic cloud B-s event) correlate linearly with the ecliptic latitude of the cloud's central axial field, the one of eight characteristic parameters of expanding magnetic cl ouds. On the basis of the parameter list determined using the expanding mag netic cloud model for all clouds to be examined, this work examines the dep endence of magnetic cloud B-s events on the other seven parameters as well as the ecliptic latitude of the cloud's central axial field. The correlatio n of the duration and intensity of magnetic cloud B-s events with the eclip tic latitude of the central axial field has been confirmed by the new param eter list with correlation coefficients higher than our earlier study. It i s found among the eight parameters that in addition to the ecliptic latitud e, the strength of the central axial field, the cloud's bulk speed, and the relative impact distance of the spacecraft to the cloud's central axis are the other parameters that are closely associated with the duration and int ensity of magnetic cloud B-s events. There are most probable values for mos t of the eight parameters of expanding magnetic clouds. In predicting the d uration and intensity of magnetic cloud B-s events using the expanding clou d model these most probable values may be used to replace those model param eters that are unavailable from solar observations. This provides a possibi lity to predict the duration and intensity of magnetic cloud B-s events bas ed on a few parameters that are available from solar observations.