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arXiv 1102.1270astro-ph.SR
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1700年以来的太阳磁场:II。总通量、极通量和开放通量的物理重建

The solar magnetic field since 1700: II. Physical reconstruction of total, polar and open flux

Jie Jiang, Robert H. Cameron, Dieter Schmitt, M. Schuessler

摘要:

我们已经使用半合成记录的基础上出现的太阳黑子群的太阳黑子数数据作为输入的表面通量输运模型重建的大规模太阳磁场和开放的日光层通量从1700年起的演变。半合成太阳黑子群记录的统计特性反映了皇家格林尼治天文台的太阳照相观测结果。其中包括太阳黑子数量和太阳黑子群纬度、纬度、面积和倾角之间的相关性。重建结果的总表面通量,极场,和日光层开放通量(由电流片源表面外推确定)同意与现有的观测或经验推导的数据和重建。我们确认了一个显着的正相关性极场活动最小期间和随后的太阳黑子周期的强度,这对太阳周期的通量传输发电机模型的影响。就在道尔顿极小值之前,在18世纪末,一个长周期之后是一个弱周期。我们发现,在1793年和1800年之间引入一个可能的“丢失”周期,导致开放通量的最小值发生了15年的变化,这与宇宙成因同位素记录是不一致的。

英文摘要:

We have used semi-synthetic records of emerging sunspot groups based on sunspot number data as input for a surface flux transport model to reconstruct the evolution of the large-scale solar magnetic field and the open heliospheric flux from the year 1700 onward. The statistical properties of the semi-synthetic sunspot group records reflect those of the observed the Royal Greenwich Observatory photoheliographic results. These include correlations between the sunspot numbers and sunspot group latitudes, longitudes, areas and tilt angles. The reconstruction results for the total surface flux, the polar field, and the heliospheric open flux (determined by a current sheet source surface extrapolation) agree well with the available observational or empirically derived data and reconstructions. We confirm a significant positive correlation between the polar field during activity minimum periods and the strength of the subsequent sunspot cycle, which has implications for flux transport dynamo models for the solar cycle. Just prior to the Dalton minimum, at the end of the 18th century, a long cycle was followed by a weak cycle. We find that introducing a possibly `lost' cycle between 1793 and 1800 leads to a shift of the minimum of the open flux by 15 years which is inconsistent with the cosmogenic isotope record.

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