ACRIMActive Cavity Radiometer Irradiance Monitor
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"N/R" means "not reported" and "N/A" means "not applicable." Instrument ACRIM III ERBE DIARAD Component Value Unc.
For ACRIM II and ACRIM III, the stated uncertainty was estimated from the cavity variation.
Instrument [R.sub.a] (mm) [d.sub.d] (mm) [R.sub.d] (mm) PM06V 4.25 95.4 2.5 DIARAD 6.52 144 4.0015 ERBE 12.09 100.8 4.039 ACRIM Baf1 6.6548 150.4696 3.9878 Baf2 6.3119 76.3524 3.9878 Total TIM 3.9894 101.6 7.62 Instrument Correction Correction Applied?
However, this correction has not been applied to the ERBE and ACRIM data shown in Fig.
Instruments such as the ACRIM series and ERBE use cavities coated with a specular black paint and a geometry designed to trap the specular reflections.
The correction required for this effect is primarily from a thermal model for some instruments (ACRIM), possibly backed up by a one-time measurement, whereas it is from frequent, ongoing measurements for others (TIM).
The ACRIM aperture design has the aperture and a portion of the baffle/cavity assembly machined as one part that is 47 mm tall, which was not directly compatible with the NIST aperture area machine.
Representatives from each of four TSI instrument teams, TIM, ACRIM, DIARAD, and PMO6, would provide an instrument that has a design basically equivalent to their respective flight instrument(s).
The data for his study come primarily from two satellite-borne instruments: ACRIM I, which functioned from 1980 to 1989, and the currently operating ACRIM II, launched in 1991.
Original plans for the ACRIM missions called for the replacement device to reach orbit before the first one ceased functioning, which would have allowed scientists to calibrate the new instrument.