文章基本信息

标题：Solar Insolation at Chennai during the 23rd Solar cycle
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作者：Samuel Selvaraj .R ; Sivamadhavi .V
期刊名称：Universal Journal of Environmental Research and Technology
电子版ISSN：2249-0256
出版年度：2011
卷号：1
期号：3
出版社：Euresian Publications
摘要：The Solar irradiance is treated as a constant (solar constant) for many practical purposes. But, actually it varies by a small amount due to various causes. The objective of this paper is to emphasize the variations produced in the total (global) radiation on a horizontal surface due to the changes in the Sun Spot Number. The region considered is Chennai, the Capital city of Tamil Nadu. We have done the data analysis during the 23rd solar cycle, which began in May, 1996 and ended in December, 2008. This solar cycle lasted for about 12.6 year. The monthly average daily global radiation on a horizontal surface at Chennai has been calculated for this period without and with the effect of the changes in the sunspot number. The estimated value including the effect of sunspot number agrees better with the measured value. The variation produced in the monthly mean daily global radiation on a horizontal surface amounts to about 0.02%
关键词：Sun spot; Solar declination; Sunrise hour angle.