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arXiv 1604.03050astro-ph.SR
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一个新的太阳信号:与活动周期无关的平均最大太阳黑子磁场

A new solar signal: Average maximum sunspot magnetic fields independent of activity cycle

William Livingston, Fraser Watson

摘要:

在过去的五年里,2010-2015年,我们在近红外(IR)中观测到了4145个太阳黑子本影的最大磁场强度。在这里我们区分场强和场通量。(Most太阳磁场仪测量通量)。本影中的最大场强与本影最小亮度的位置是同空间的(Norton和Gilman,2004)。我们用Fe 15648.5 A谱线的塞曼分裂来测量场强.我们表明,在IR没有周期依赖于平均最大场强(2050 G)已被发现+/- 20高斯。对太阳动力学天文台上的日震和磁成像仪观测到的17,450个点进行类似的分析,揭示了同样的周期独立性+/- 0.18 G,或0.01%的方差。这一点在2010-2015年最低至最高周期内没有变化。得出太阳平均最大本影场随时间变化的结论。

英文摘要:

Over the past five years, 2010-2015, we have observed, in the near infrared (IR), the maximum magnetic field strengths for 4145 sunspot umbrae. Herein we distinguish field strengths from field flux. (Most solar magnetographs measure flux). Maximum field strength in umbrae is co-spatial with the position of umbral minimum brightness (Norton and Gilman, 2004). We measure field strength by the Zeeman splitting of the Fe 15648.5 A spectral line. We show that in the IR no cycle dependence on average maximum field strength (2050 G) has been found +/- 20 Gauss. A similar analysis of 17,450 spots observed by the Helioseismic and Magnetic Imager onboard the Solar Dynamics Observatory reveal the same cycle independence +/- 0.18 G., or a variance of 0.01%. This is found not to change over the ongoing 2010-2015 minimum to maximum cycle. Conclude the average maximum umbral fields on the Sun are constant with time.

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