Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-05-22
Astronomy and Astrophysics
Astrophysics
10 pages, 6 figures, 1 table, AASTeX with emulateapj5.sty, this new version uses figures to replace tables, and adds a new sec
Scientific paper
A magnetic flux tube may be considered both as a separate body and as a confined field. As a field, it is affected both by the cyclonic convection ($\alpha$-effect) and differential rotation ($\Omega$-effect). As a body, the tube experiences not only a buoyant force, but also a dynamic pressure due to downflows above the tube. When these two dynamic effects are incorporated into the $\alpha\Omega$ dynamo equations, we obtain a dynamo operating in the convection zone. We analyze and solve the extended dynamo equations in the linear approximation by using observed solar internal rotation and assuming a downflow suggested by numerical simulations of the solar convection zone. The results produce: (i) the 22-year cycle period; (ii) the extended butterfly diagram; (iii) the confinement of strong activity to low heliographic latitudes $|\Phi|\le 35^\circ$; (iv) at low latitudes the radial field is in an approximately $\pi$ phase lag compared to the toroidal field at the same latitude; (v) the poleward branch is in a $\pi/2$ phase lag with respect to the equatorward branch; (vi) most of the magnetic flux is present in a strongly intermittent form, concentraed into strong flux tubes; (vii) the magnetic field peaks at a depth of $r=0.96 R_{\sun}$; (viii) total solar irradiance varies in phase with the solar cycle activity, having an amplitude of 0.1%; (ix) solar effective temperature varies in phase with the solar cycle activity, having an amplitude of 1.5 $^\circ C$; and (x) solar radius also varies in phase with the solar cycle activity, having an amplitude of 20 mas. All these results are in agreement with the corresponding observations.
Li Ling-Huai
Sofia Sabatino
No associations
LandOfFree
A convection zone dynamo including the effects of magnetic buoyancy and downward flows does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A convection zone dynamo including the effects of magnetic buoyancy and downward flows, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A convection zone dynamo including the effects of magnetic buoyancy and downward flows will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-492768