Energy balance in solar active regions: The dip of April, 1985 |
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| Affiliation: | 1. College of Civil Engineering, Xiangtan University, Xiangtan 411105, China;2. National Center for Applied Mathematics in Hunan, Xiangtan 411105, China;1. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, China;2. School of Transportation Engineering, East China Jiaotong University, Nanchang, China;1. Dept. of Data Science, Cardiff School Of Technologies, Cardiff Metropolitan University, Cardiff CF5 2YB, UK;2. Dept. of Applied Electronics & Instrumentation Engineering, Haldia Institute of Technology, Haldia 721657, India;3. Dept.of Computer Science & Electronics, Ramakrishna Mission Vidyamandira, Belur Math 711202, India |
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| Abstract: | The presence of a solar active region affects the luminosity of the sun. Sunspots directly produce “dips” in the total solar irradiance approximately proportionally to their projected area, while faculae produce excess energy. These effects were discovered during the solar maximum period of 1980, and in this paper we examine the sunspot effect during solar minimum. We examine the “dip” due to an active region in April, 1985, as observed in the total solar irradiance by the ACRIM instrument on the Solar Maximum Mission. These data (obtained after the spacecraft repair in May, 1984) have simple variations, relative to those observed in 1980, because of the reduced level of activity approaching solar minimum. We find that the PSI index of projected sunspot area as defined in 1980 appears to describe this “dip” satisfactorily. |
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