The roles of the north-south component of the interplanetary magnetic field on large-scale auroral dynamics observed by the DMSP satellite

摘要: Abstract An extensive study of DMSP photographs and the simultaneous interplanetary magnetic field data suggests that quantity defined by S=∫ τ 0 (Ф D − Ф N )dt has a fundamental importance in substorm processes, where ΦD ΦN denote production rate merged (or open) lines along dayside X-line reconnected closed) nightside X-line, respectively; t = is measured from time when Bz component begins to decrease after prolonged period large positive value. It shown, first all, substorms occur so long as S > 0, regardless sign its changes (namely, southward northward turnings) derivative well. Secondly, intensity proportional S2. By introducing S, recent confusion problem roles north-south on processes can be removed. Since equal amount open fluxes at reckoned it (A1 A0), A0 denotes minimum polar cap area bounded auroral oval) A1 an arbitrary t. Therefore, whenever oval larger than size. Further, intense tends oval. The also considered excess flux, thus process which magnetosphere remove sporadically energy associated with S.