Features of Slow Sunspot Dissipation


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According to a model of sunspot dissipation through a thin boundary layer between the sunspot magnetic flux tube and the surrounding medium, the rate of decrease in the sunspot area must slow as the spot size decreases until it reaches a critical threshold at which the linear law of sunspot dissipation gives way to a nonlinear one. This theoretically predicted effect is confirmed with SOHO/MDI data, which have a high spatial and temporal resolution in comparison with ground-based observations. This work confirms the dissipation slowdown effect in small sunspots. It is reported that the nonlinear dissipation phase derived from discrete receiver (charge-coupled device, CCD) data is somewhat flatter and more diffuse than that derived from continuous radiation receiver data (photographic plates).

作者简介

I. Zhivanovich

Main (Pulkovo) Astronomical Observatory, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: ivanzhiv@live.com
俄罗斯联邦, St. Petersburg

A. Solov’ev

Main (Pulkovo) Astronomical Observatory, Russian Academy of Sciences; Kalmyk State University

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Email: solov@gaoran.ru
俄罗斯联邦, St. Petersburg; Elista

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