Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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THE CYCLIC VARIATION OF SOLAR PHOTOSPHERIC INTENSITY FROM SOHO IMAGES

  • Jeong, Dong-Gwon (Department of Earth Science Education, Chonnam National University) ;
  • Park, Hyungmin (National Youth Space Center) ;
  • Moon, Byeongha (Department of Earth Science Education, Chonnam National University) ;
  • Oh, Suyeon (Department of Earth Science Education, Chonnam National University)
  • Received : 2017.05.22
  • Accepted : 2017.07.17
  • Published : 2017.08.31
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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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References

  1. Albregtsen, F., & Maltby, P. 1981, Solar Cycle Variation of Sunspot Intensity, Sol. Phys., 71, 269 https://doi.org/10.1007/BF00167551
  2. Appenzeller, I., & Schroter, E. H. 1967, Center-to-Limb Variations of the Intensity and the Wavelength of Several Fraunhofer Lines along the Sun'S Polar and Equatorial Diameter, ApJ, 147, 1100 https://doi.org/10.1086/149098
  3. Auffret, H., & Muller, R. 1991, Center-to-Limb Variation of the Network Bright Points in the Solar Photosphere, A&A, 246, 264
  4. Hara, H., & Nakakubo-Morimoto, K. 2003, Variation of the X-Ray Bright Point Number over the Solar Activity Cycle, ApJ, 589, 1062 https://doi.org/10.1086/374778
  5. Heath, D. F., & Schlesinger, B. M. 1986, The Mg 280-nm Doublet as a Monitor of Changes in Solar Ultraviolet Irradiance, JGR, 91, 8672 https://doi.org/10.1029/JD091iD08p08672
  6. Kononovich, E. V., & Mironova, I. V. 2006, The Wolf Number and Total Solar Irradiance Variations during 21-23 Solar Cycles, Astron. Astrophys. Transactions, 25, 341 https://doi.org/10.1080/10556790601106324
  7. Lee, R. B. III., Gibson, M. A., Wilson, R. S., et al. 1995, Long-Term Total Solar Irradiance Variability during Sunspot Cycle 22, JGR, 100, 1667 https://doi.org/10.1029/94JA02897
  8. Linsky, J. L. 1977, in O. R. White (ed.), The Solar Output and Its Variation (Boulder: Colorado Assoc. Univ. Press)
  9. Moon, B., Jeong, D.-G., Oh, S., et al. 2017, Variation in Solar Limb Darkening Coefficient Estimated from Solar Images Taken by SOHO and SDO, J. Astron. Space Sci., 34, 99 https://doi.org/10.5140/JASS.2017.34.2.99
  10. Nakakubo, K., & Hara, H. 2000, Variation of X-Ray Bright Point Number over the Solar Activity Cycle, Adv. Space Res., 25, 1905 https://doi.org/10.1016/S0273-1177(99)00621-3
  11. Oh, S., & Kim, B. 2013, Variation of Solar, Interplanetary and Geomagnetic Parameters during Solar Cycles 21-24, J. Astron. Space Sci., 30, 101 https://doi.org/10.5140/JASS.2013.30.2.101
  12. Pap, J., Anklin, M., Frohlich, C., et al. 1999, Variations in Total Solar and Spectral Irradiance as Measured by the VIRGO Experiment on SOHO, Adv. Space Res., 24, 215 https://doi.org/10.1016/S0273-1177(99)00503-7
  13. Pap, J. M., Turmon, M., Floyd, L., et al. 2002, Total Solar and Spectral Irradiance Variations from Solar Cycles 21 to 23, Adv. Space Res., 29, 1923 https://doi.org/10.1016/S0273-1177(02)00237-5
  14. Scherrer, P. H., Bogart, R. S., Bush, R. I., et al. 1995, The Solar Oscillations Investigation - Michelson Doppler Imager, Solar Phys., 162, 129 https://doi.org/10.1007/BF00733429
  15. Schmahl, E. J., & Kundu, M. R. 1994, Solar Cycle Variation of the Microwave Spectrum and Total Irradiance, Sol. Phys., 152, 167 https://doi.org/10.1007/BF01473200
  16. Unruh, Y. C., Solanki, S. K., & Fligge, M. 1999, The Spectral Dependence of Facular Contrast and Solar Irradiance Variations, A&A, 345, 635
  17. Viereck, R. A., & Puga, L. C. 1999, The NOAA Mg ii Core-to-Wing Solar Index: Construction of a 20-Year Time Series of Chromospheric Variability from Multiple Satellites, JGR, 104, 9995 https://doi.org/10.1029/1998JA900163
  18. White, O. R., & Livingston, W. C. 1978, Solar Luminosity Variation. II - Behavior of Calcium H and K at Solar Minimum and the Onset of Cycle 21, ApJ, 226, 679 https://doi.org/10.1086/156650
  19. White, O. R., & Livingston, W. C. 1981, Solar Luminosity Variation. III - Calcium K Variation from Solar Minimum to Maximum in Cycle 21, ApJ, 249, 798 https://doi.org/10.1086/159338