Zonal Velocity Bands and the Solar Activity Cycle
نویسندگان
چکیده
We compare the zonal flow pattern in subsurface layers of the Sun with the distribution of surface magnetic features like sunspots and polar faculae. We demonstrate that in the activity belt, the butterfly pattern of sunspots coincides with the fast stream of zonal flows, although part of the sunspot distribution does spill over to the slow stream. At high latitudes, the polar faculae and zonal flow bands have similar distributions in the spatial and temporal domains.
منابع مشابه
Experimental investigation of a solar desalination performance based on humidification-dehumidification technique with air and water closed cycle
In this study, the performance of solar desalination by humidification-dehumidification of closed air and water in Ahvaz city was investigated. This desalination includes a collector, condenser, salty water, freshwater tanks, air blower, and water pump. The evaluation of the system was done at three levels of air velocity (3, 4, and 5 m/s) and at three pump discharge levels (2, 4, and 6 liters/...
متن کاملSolar rotation rate and its gradients during cycle 23
Available helioseismic data now span almost the entire solar activity cycle 23 making it possible to study solar-cycle related changes of the solar rotation rate in detail. In this paper we study how the solar rotation rate, in particular, the zonal flows change with time. In addition to the zonal flows that show a well known pattern in the solar convection zone, we also study changes in the ra...
متن کاملOn the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurements*
At the Collm Observatory of the University of Leipzig LF D1 low-frequency total re ̄ection nighttime wind measurements have been carried out continuously for more than two decades. Using a multiple regression analysis to derive prevailing winds, tides and the quasi-2-day wave from the half-hourly mean values of the horizontal wind components, monthly mean values of mesopause wind parameters are ...
متن کاملGlobal characteristics of Pc1 magnetic pulsations during solar cycle 23 deduced from CHAMP data
We present a global climatology of Pc1 pulsations as observed by the CHAMP satellite from 2000 to 2010. The Pc1 center frequency and bandwidth are about 1 and 0.5 Hz, respectively. The ellipticity is mostly linear with the major axis almost aligned with the magnetic zonal direction. The diurnal variation of Pc1 occurrences shows a primary maximum early in the morning and a secondary maximum dur...
متن کاملar X iv : a st ro - p h / 02 11 54 8 v 1 2 5 N ov 2 00 2 Changes in Solar Dynamics from 1995 to 2002
Data obtained by the GONG and MDI instruments over the last seven years are used to study how solar dynamics — both rotation and other large scale flows — have changed with time. In addition to the well known phenomenon of bands of faster and slower rotation moving towards the equator and pole, we find that the zonal flow pattern rises upwards with time. Like the zonal flows, the meridional flo...
متن کامل