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首页> 美国卫生研究院文献>Springer Open Choice >Decoupling Solar Variability and Instrument Trends Using the Multiple Same-Irradiance-Level (MuSIL) Analysis Technique
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Decoupling Solar Variability and Instrument Trends Using the Multiple Same-Irradiance-Level (MuSIL) Analysis Technique

机译：使用多重等辐照度水平（MuSIL）分析技术将太阳变异性与仪器趋势分离

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The solar spectral irradiance (SSI) dataset is a key record for studying and understanding the energetics and radiation balance in Earth’s environment. Understanding the long-term variations of the SSI over timescales of the 11-year solar activity cycle and longer is critical for many Sun–Earth research topics. Satellite measurements of the SSI have been made since the 1970s, most of them in the ultraviolet, but recently also in the visible and near-infrared. A limiting factor for the accuracy of previous solar variability results is the uncertainties for the instrument degradation corrections, which need fairly large corrections relative to the amount of solar cycle variability at some wavelengths. The primary objective of this investigation has been to separate out solar cycle variability and any residual uncorrected instrumental trends in the SSI measurements from the Solar Radiation and Climate Experiment (SORCE) mission and the Thermosphere, Mesosphere, Ionosphere, Energetic, and Dynamics (TIMED) mission. A new technique called the Multiple Same-Irradiance-Level (MuSIL) analysis has been developed, which examines an SSI time series at different levels of solar activity to provide long-term trends in an SSI record, and the most common result is a downward trend that most likely stems from uncorrected instrument degradation. This technique has been applied to each wavelength in the SSI records from SORCE (2003 – present) and TIMED (2002 – present) to provide new solar cycle variability results between 27 nm and 1600 nm with a resolution of about 1 nm at most wavelengths. This technique, which was validated with the highly accurate total solar irradiance (TSI) record, has an estimated relative uncertainty of about 5% of the measured solar cycle variability. The MuSIL results are further validated with the comparison of the new solar cycle variability results from different solar cycles.
机译：太阳光谱辐照度（SSI）数据集是研究和了解地球环境中的能量和辐射平衡的关键记录。对于11个太阳活动周期的时间尺度以及更长的时间，了解SSI的长期变化对于许多太阳地球研究主题至关重要。自1970年代以来，就对卫星进行了SSI的测量，其中大多数是在紫外线下进行的，但最近也在可见光和近红外下进​​行了测量。先前太阳可变性结果准确性的一个限制因素是仪器退化校正的不确定性，相对于某些波长的太阳循环可变性的量，需要进行相当大的校正。这项研究的主要目的是从太阳辐射和气候实验（SORCE）任务以及热层，中层，电离层，高能和动力学（TIMED）中分离出太阳周期变化和SSI测量中任何残留的未校正仪器趋势。任务。已经开发出一种称为多重同辐照度水平（MuSIL）分析的新技术，该技术可以检查不同太阳活动水平的SSI时间序列，以提供SSI记录的长期趋势，最常见的结果是向下这种趋势很可能源于未经校正的仪器降级。这项技术已应用于SORCE（2003-至今）和TIMED（2002-至今）的SSI记录中的每个波长，以提供新的太阳周期变异性结果，在27nm至1600nm之间，在大多数波长下分辨率约为1nm。这项技术已通过高度准确的总太阳辐照度（TSI）记录进行了验证，其估计的相对不确定性约为所测太阳周期变化的5％。通过比较来自不同太阳周期的新太阳周期变异性结果，进一步验证了MuSIL结果。

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