IJCRRI Journ Cur Res ReInternational Journal of Current Research and ReviewI Journ Cur Res Re2231-21960975-5241Radiance Research Academy2045General SciencesSOLAR CONSTANT, SUNSPOTS AND SOLAR ACTIVITY .SumathiRSelvarajR. Samuel)3640This article is copyright of Popeye Publishing, 20092009This is an open-access article distributed under the terms of the Creative Commons Attribution (CC BY 4.0) Licence. You may share and adapt the material, but must give appropriate credit to the source, provide a link to the licence, and indicate if changes were made.

This paper deals with study of sunspot numbers and solar energy since 1755. Number of sunspots and solar energy varies for each solar cycle. The duration of solar cycle is from 9 to 11 years. It varies every time. Solar cycle is the time interval from a sunspot minimum to the next sunspot minimum.

Solar Constant Sunspot Number and Solar activity