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A Comparative Study of Solar Total Irradiance Measured by Active-cavity Radiometers

1993; IOP Publishing; Volume: 30; Issue: 4 Linguagem: Inglês

10.1088/0026-1394/30/4/010

1681-7575

Ann T. Mecherikunnel,

Atmospheric Ozone and Climate

This paper presents the results from a comparative study of solar total irradiance data from the Earth Radiation Budget Experiment (ERBE) on board the Earth Radiation Budget Satellite (ERBS), and the Solar Maximum Mission Active Cavity Radiometer Irradiance Monitor-1 (SMM/ACRIM), for the overlap period 25 October 1984 to 5 July 1989. Both measurements used active-cavity radiometers (ACR). For days when measurements are available from both satellites, the mean difference in the irradiance values is 2,18 W·m-2. The data show good agreement both in the details of the day-to-day variations and in the long-term trends. The irradiance variations observed in the measurements track the solar activity cycle quite well. The amplitude of the solar cycle related irradiance variation is 0,1%. For the period October 1984 to July 1989, a correlation coefficient of 0,781 is obtained for the two data sets. The correlation becomes stronger with the increase in solar activity, but breaks down for low solar activity periods. Independent studies of ERBS/ERBE and Nimbus-7/ERB; SMM/ACRIM and Nimbus-7/ERB also show high correlation between the data sets during high solar activity periods.