文章基本信息

标题：Field distribution of magnetograms from simulations of active region formation
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作者：S. Dacie ; S. Dacie ; L. van Driel-Gesztelyi 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2017
卷号：606
页码：1-8
DOI：10.1051/0004-6361/201730767
语种：English
出版社：EDP Sciences
摘要：Context. The evolution of the photospheric magnetic field distributions (probability densities) has previously been derived for a set of active regions. Photospheric field distributions are a consequence of physical processes that are difficult to determine from observations alone. Aims. We analyse simulated magnetograms from numerical simulations, which model the emergence and decay of active regions. These simulations have different experimental set-ups and include different physical processes, allowing us to investigate the relative importance of convection, magnetic buoyancy, magnetic twist, and braiding for flux emergence. Methods. We specifically studied the photospheric field distributions (probability densities found with a kernel density estimation analysis) and compared the results with those found from observations. Results. Simulations including convection most accurately reproduce the observed evolution of the photospheric field distributions during active region evolution. Conclusions. This indicates that convection may play an important role during the decay phase and also during the formation of active regions, particularly for low flux density values.
关键词：enmagnetic fieldsmagnetohydrodynamics (MHD)Sun: photospheresunspotsmethods: statisticalmethods: numerical