Magnetohydrodynamics of an Active Region

摘要: The dynamics of the magnetic fields which are imbedded into non-stationary outer layers Sun show many facets interest to observers and theoreticians alike. In a short review I can only deal with small number them occasionally glance at some others. hate call these frozen matter is rather in boiling state, but electrical conductivity high enough keep flux together for long times, so that we discuss most important questions within framework magnetohydrodynamics infinite conductivity. will first talk mainly about below photosphere, where controls motion field, secondly intermediate state near field have comparable energy, finally upper material motion.