SDO/EVE Level 3 Version 8 Mission-Long Data

EVE level 3 data files were created at the Laboratory for Atmospheric and Space Physics in Boulder, Colorado for the NASA Solar Dynamics Observatory (SDO) Extreme Ultraviolet Variability Experiment (EVE). The Science Processing and Operations Center (SPOC) is responsible for creating and maintaining access to all EVE products. For a high-level introduction to the EVE instrumentation please visit:
https://lasp.colorado.edu/home/eve/science/instrument/

Level 3 products are defined to contain daily averages beginning on 2010, day 120, April 30. This version change includes updated long-term degradation corrections for MEGS-B and ESP. A small dark adjustment was applied to MEG-B and large degradation changes were applied based on SDO EVE sounding rocket measurements. The MEGS-P (Lyman-alpha) diode processing has been updated to replace the Kalman filter with a Fourier transform filter, and the calibration has been updated to match SORCE SOLSTICE version 17.

The mission length merged datasets are provided at three sampling sizes for user convenience; specifically, native level 2 sampling (0.02nm), 1 angstrom, and 1 nm. The optical resolution is about 0.1 nm, so the 0.02nm spectra contain 5 samples per resolution element.

EVE 3级数据文件由位于科罗拉多州博尔德的大气与空间物理实验室（Laboratory for Atmospheric and Space Physics, LASP）为美国国家航空航天局（NASA）太阳动力学天文台（Solar Dynamics Observatory, SDO）极紫外变率实验（Extreme Ultraviolet Variability Experiment, EVE）生成。科学处理与运行中心（Science Processing and Operations Center, SPOC）负责创建所有EVE产品并维护其访问渠道。如需了解EVE仪器的高层次概述，请访问：https://lasp.colorado.edu/home/eve/science/instrument/

3级产品被定义为包含自2010年第120天（即4月30日）起的日平均数据集。本次版本更新涵盖了针对MEGS-B与ESP的长期性能衰变校正优化。针对MEG-B应用了小幅暗电平校正，并基于SDO EVE探空火箭的实测数据实施了大幅性能衰变修正。MEGS-P（莱曼-α，Lyman-alpha）二极管的数据处理流程已完成更新，以傅里叶变换滤波（Fourier transform filter）替代原有的卡尔曼滤波（Kalman filter），且校准参数已更新至与SORCE SOLSTICE版本17保持一致。

为便于用户使用，任务时长合并数据集提供三种采样粒度：原生2级采样（0.02nm）、1埃（angstrom）以及1nm。该仪器的光学分辨率约为0.1nm，因此0.02nm分辨率的光谱在每个分辨率单元内包含5个采样点。

搜集汇总

背景与挑战

背景概述

该数据集是NASA太阳动力学天文台（SDO）极端紫外线变异性实验（EVE）的Level 3版本8任务长期数据，包含从2010年4月30日开始的日平均值，用于监测太阳紫外线辐射。数据集特点包括更新了仪器退化校正和校准处理，并提供三种采样尺寸（0.02nm、1埃、1nm）的光谱数据，以支持高分辨率太阳活动分析。