THE CYCLIC VARIATION OF SOLAR PHOTOSPHERIC INTENSITY FROM SOHO IMAGES

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Journal of the Korean Astronomical Society Pub Date : 2017-08-31 DOI:10.5303/JKAS.2017.50.4.105
Dong-Gwon Jeong, Hyungmin Park, Byeonghak Moon, Suyeon Oh
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Abstract

: The well-known solar cycle controls almost the entire appearance of the solar photosphere. We therefore presume that the continuous emission of visible light from the solar surface follows the solar cyclic variation. In this study, we examine the solar cyclic variation of photospheric brightness in the visible range using solar images taken by the Solar and Heliospheric Observatory (SOHO)/Michelson Doppler Imager (MDI). The photospheric brightness in the visible range is quantified via the relative intensity acquired from in the raw solar images. In contrast to total solar irradiance, the relative intensity is out of phase with the solar cycle. During the solar minimum of solar cycles 23–24, the relative intensity shows enhanced heliolatitudinal asymmetry due to a positive asymmetry of the sunspot number. This result can be explained by the strength of the solar magnetic field that controls the strength of convection, implying that the emission in the visible range is controlled by the strength of convection. This agrees with the photospheric brightness increasing during a period of long spotless days.
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从SOHO图像看太阳光球强度的周期变化
:众所周知的太阳周期几乎控制着太阳光球的整个外观。因此,我们假设太阳表面可见光的连续发射遵循太阳周期变化。在这项研究中,我们使用太阳和日光层天文台(SOHO)/迈克尔逊多普勒成像仪(MDI)拍摄的太阳图像,研究了可见光范围内光球亮度的太阳周期变化。可见光范围内的光球亮度是通过从原始太阳图像中获得的相对强度来量化的。与太阳总辐照度相反,相对强度与太阳周期不同步。在太阳周期23-24的太阳极小期,由于太阳黑子数量的正不对称性,相对强度显示出增强的日纬不对称性。这一结果可以用控制对流强度的太阳磁场强度来解释,这意味着可见光范围内的发射由对流强度控制。这与光球亮度在长时间无污染的日子里的增加相一致。
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来源期刊
Journal of the Korean Astronomical Society
Journal of the Korean Astronomical Society 地学天文-天文与天体物理
CiteScore
1.30
自引率
10.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.
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