Observations and Simulations of the Polar Field Reversals in Cycle 23

摘要: We have used observations obtained by the National Solar Observatory at Kitt Peak to study reversals of polar magnetic fields in Cycle 23. compared them with corresponding data Mt. Wilson Observatory, when these are available, testing both sets against locations Hα filaments. Because unreliability extreme latitudes and because apparent time reversal varies degree smoothing applied data, it is difficult determine precise each hemisphere from direct observations. However, we show that possible obtain a better-defined more using maps derived simulations synoptic fields. These indirect values, however, depend critically on diffusivity simulations. various tests confirm an empirical value for parameter about 600 km2 s−1 hence determined times CR 1976 northern 1981 south.