On the large-scale diffuse magnetic field of the sun |
| |
Authors: | Mausumi Dikpati and Arnab Rai Choudhuri |
| |
Institution: | (1) Department of Physics, Indian Institute of Science, 560012 Bangalore, India;(2) Indian Institute of Astrophysics, 560034 Bangalore, India;(3) Kiepenheuer-Institut für Sonnenphysik, D-79104 Freiburg, Germany |
| |
Abstract: | Although the sunspots migrate towards the equator, the large-scale weak diffuse magnetic fields of the Sun migrate poleward with the solar cycle, the polar field reversing at the time of the sunspot maxima. We apply the vector model of Dikpati and Choudhuri (1994, Paper I) to fit these observations. The dynamo layer at the base of the convection zone is taken to be the source of the diffuse field, which is then evolved in the convection zone subject to meridional circulation and turbulent diffusion. We find that the longitudinally averaged observational data can be fitted reasonably well both for positive and negative values of the -effect by adjusting the subsurface meridional flow suitably. The model will be extended in a future paper to include the decay of active regions as an extra source of the diffuse field, which may be necessary to explain the probable phase lag betweenB
r andB
at lower latitudes. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|