The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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The solar cyclic variation of photospheric intensity analyzed from solar images

  • Jeong, Dong-Gwon (Department of Earth Science Education, Chonnam National University) ;
  • Moon, Byeongha (Department of Earth Science Education, Chonnam National University) ;
  • Park, Hyungmin (National Youth Space Center) ;
  • Oh, Suyeon (Department of Earth Science Education, Chonnam National University)
  • Published : 2016.10.12
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Abstract

The Sun has diverse variations in solar atmosphere's layers due to solar activity. This solar variations can be recognized easily by sunspots which appear on the solar photosphere. Thus the sunspot on the photosphere is utilized by direct index of the solar activity. The other variation of the photosphere is center-to-limb variation (CLV). In this study, we analyze the relative intensity observed by SOHO, SDO. The data of photospheric intensity are from full disk images of SOHO/MDI intensity ($6768{\AA}$, from May 1994 to March 2011) and of SDO/HMI intensity ($6173-6174{\AA}$, from May 2010 to June 2016). As the result, we found the latitudinal variation of the intensity. The daily photospheric intensity showed the solar cyclic variation with sunspot number. It has a little difference of phase with sunspot number.

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