Abstract: The total sunspot area (TSSA),complex total solar irradiance(CTSI) are two important parameters in solar astrophycics studies. These two paramters are correlated with each other. 27day solar activity shows heighest correlation1 between them. Also TSSA and CTSI shows delay / lag w r t each other which is identified as delay (D).
Three solar cycles ( 21,22,23) data is investigated for this delay phenomena1. The 27day averaged data for TSSA,CTSI confirms existance of delay between TSSA,CTSI. Also the investigation shows that TSSA and D are exponentialy related. Two new constants KR,Rh ( called ROHINI constants) & C correction factor for TSSA are identified ,which play a very important role in solar astrophysics.

Keywords: SSA, TSSA, CTSI, Delay, SSN, ROHINI constants

| DOI: 10.17148/IARJSET.2022.9287