Vortragender: Gopal Hazra

MPS Seminar: Flux Transport Dynamo Models: Understanding theSolar Magnetic Field generation process (G. Hazra)

The solar cycle is the magnetic cycle of the Sun. Inorder to understand the solar cycle and its properties, we need to understandhow the Sun is generating its own magnetic fields and organizing them. The FluxTransport Dynamo model is the most successful model to understand the solarmagnetic field generation process. But it has some inherent limitations. Inmost of the dynamo models, a single cell meridional circulation is used butthere is some recent observational evidence that the meridional circulation ofthe Sun may not have a single cell structure rather it might have a double cellor multi-cell structure. I shall discuss that the new observations are notimposing any serious threat and our model works perfectly fine. Many processesin this models are inherently 3D. In 2D we can model them very crudely by usingsome simple parametric form. So I shall explain the next generation 3D Flux TransportDynamo model which will be more realistic. The build up of solar polar fieldsusing this model will also be discussed. Apart from that I shall discuss thathow inclusion of observed high resolution non-axisymmetric convective flows inour model from SDO Dopplergram data affects the behaviour of theBabcock-Leighton process and helps us to put a better constraint on the surfacediffusivity. [mehr]
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