About Isolated Quasi-axi-symetric Sunspots: Description, Statistical Analysis and Theoretical Modelling

Details About Isolated Quasi-axi-symetric Sunspots: Description, Statistical Analysis and Theoretical Modelling About Isolated Quasi-axi-symetric Sunspots: Description, Statistical Analysis and Theoretical Modelling

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12..3.6k&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

We briefly review the question of the occurrence, during a sunspot cycle, of well isolated sunspots. This includes big sunpots like the one observed in Nov. 2006. We note that a quasi- axi-symmetric morphology is clearly NOT observed when the morphological details of both the umbra and penumbra are considered. However, the occurrence of persistent coherent penumbral waves, the magnetic moat behavior, the bright ring phenomena, etc. seem to justify a revival of the former and revised Larmor model of a sunspot (the so-called the P. Lorrain model).
To discuss the "emergence" of single sunspots from deep layers, we performed statistical analysis limited to cycle 23 based on MDI images taken in the continuum and using magnetograms. Surprisingly, single sunspots are definitely and preferably found to occur at low latitude and during the descending branch of the cycle.
To explain our observations, we suggest the occurrence of magnetic loops orthogonal to the local radius, similar to "smoke rings" arriving at the surface of the Sun. The rings will only very slightly feel the Coriolis force at low latitudes, which is consistent with our observations.

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