Toward a Mean Field Formulation of the Babcock-Leighton Type Solar Dynamo. I. α-Coefficient versus Durney's Double-Ring Approach

We develop a model of the solar dynamo in which, on the one hand, we follow the Babcock-Leighton approach to include surface processes, such as the production of poloidal field from the decay of active regions, and, on the other hand, we attempt to develop a mean field theory that can be studied in quantitative detail. One of the main challenges in developing such models is to treat the buoyant rise of the toroidal field and the production of poloidal field from it near the surface. A previous paper by Choudhuri, Schüssler, & Dikpati in 1995 did not incorporate buoyancy. We extend this model by two contrasting methods. In one method, we incorporate the generation of the poloidal field near the solar surface by Durney's procedure of double-ring eruption. In the second method, the poloidal field generation is treated by a positive α-effect concentrated near the solar surface coupled with an algorithm for handling buoyancy. The two methods are found to give qualitatively similar results.

Testing for fat in milk by the Babcock test /

Cover title.

Thoughts for every-day living from the spoken and written words of Maltbie Davenport Babcock.

Mode of access: Internet.

Topographical survey for grounds of Mr. O.E. Babcock; Lake Forest, Illinois

Red and black ink on linen. Topo lines, elevations (location, type of trees). Signed. 106 cm. x 32 cm. Scale: 1"=30' [from photographic copy by Lance Burgharrdt]

Plan for the tile drain and grades for grounds of Mr. O.C. Babcock; Lake Forest, Illinois

Red and black ink on linen. Topo lines, tile lines, distances, profile of grape arbor. Signed. 106 cm. x 34 cm. Scale: 1"=30' [from photographic copy by Lance Burgharrdt]

Planting plan for grounds of Mr. O.E. Babcock; Lake Forest, Illinois

Ink on linen. Elevations, location, types of plantings, grape arbor, gardens, pool. Signed. 105 cm. x 31 cm. Scale: 1"=30' [from photographic copy by Lance Burgharrdt]

Revised planting plan for grounds of Mr. O.E. Babcock; Lake Forest, Illinois

Ink on linen. Location of driveways and of residence changed from Bac3; gardens, second pool added. 104 cm. x 32 cm. Scale: 1"=30' [from photographic copy by Lance Burgharrdt]

Revised plan for tile drains and water pipes for grounds of Mr. O.E. Babcock; Lake Forest, Illinois

Pencil on linen. Location of driveways and of residence changed from Bac3; gardens, second pool added. 104 cm. x 32 cm. Scale: 1"=30' [from photographic copy by Lance Burgharrdt]