研究目的
To derive a novel correction for SIM degradation using the total solar irradiance (TSI) measurements from the Total Irradiance Monitor (TIM) on SORCE, applied to SIM SSI data from September 2004 to October 2012 over the wavelength range from 205 nm to 2300 nm.
研究成果
The study presents a novel degradation correction method for SORCE SIM SSI, constrained by SORCE TIM TSI, showing agreement with solar models within uncertainties and disagreeing with the currently published SSI V23 in the UV outside of the 95% confidence interval. The corrected integrated SSI agrees within 0.1 W m?2 (1σ) with TSI by SORCE TIM relative to 2009.
研究不足
The correction does not account for additional degradation that may have occurred prior to the first measurement in the study time period, nor does it account for any systematic wavelength-dependent offsets. The method is not recommended to replace the type of on-orbit degradation monitoring that will be employed by future space-based absolute spectral irradiance instruments.
1：Experimental Design and Method Selection:
The study uses a novel degradation correction method for SORCE SIM SSI, constrained by SORCE TIM TSI. The methodology involves comparing the spectrally integrated SSI from SIM with TSI measurements from TIM to derive the total SIM degradation over the mission time period considered.
2：Sample Selection and Data Sources:
The study focuses on the period from September 2004 to October 2012, excluding data prior to September 2004 due to larger-than-acceptable uncertainty in wavelength scale.
3：List of Experimental Equipment and Materials:
The SORCE SIM instrument, which includes two silicon photodiodes, an InGaAs photodiode, and an ESR, and the SORCE TIM instrument, which consists of four null-balance electrical substitution radiometers (ESRs).
4：Experimental Procedures and Operational Workflow:
The correction involves calculating the change in irradiance over time for every wavelength, smoothing over time and spectral domains, and applying a correction factor derived from the difference between integrated SSI and TSI.
5：Data Analysis Methods:
The corrected data are compared to solar models (SATIRE-S and NRLSSI2) and other SSI datasets (OMI and SOLSTICE) to validate the correction method.
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