IRIS$^{2+}$反演工具：恢复日球层大气的辐射损失和热力学
The IRIS$^{2+}$ inversion tool: recovering the radiative losses and the thermodynamics in the lower solar atmosphere
AI总结：
IRIS$^{2+}$是一种快速可靠的反演工具，用于恢复日球层大气的热力学和辐射损失。
摘要：
我们介绍了一种改进且快速的反演工具，能够从光球层到色球顶提供太阳大气的热力学状态，以及为IRIS观测数据计算色球中的积分辐射损失。该NASA任务自2013年起开始观测太阳，并提供多种谱线观测数据，这些数据对研究下层太阳大气的变化具有敏感性。本文基于IRIS$^{2+}$数据库介绍了新的反演工具IRIS$^{2+}$，该数据库包含135,472个合成代表性谱线（RP），每个RP由6条色球谱线和6条光球谱线组成，其对应的代表性大气模型（RMA）以及与这些大气相关的积分辐射损失（IRL）。通过使用最近邻（k-nn）模型算法，利用合成代表性谱线训练模型，以预测数据库中最接近观测到的RP。当IRIS$^{2+}$确定最接近的RP时，会将对应的RMA和IRL分配给该观测谱线的位置。我们比较了IRIS$^{2+}$与最先进的反演代码STiC获得的结果，STiC也用于构建IRIS$^{2+}$数据库。我们发现，在大多数情况下，两种方法获得的热力学状态和IRL是相当的。因此，IRIS$^{2+}$是一种快速且可靠的反演工具，能够为各种由IRIS观测到的太阳场景提供下层太阳大气热力学状态和辐射损失的近似值。
英文摘要：
We introduce an improved and fast inversion tool that is able to provide the thermodynamics of the solar atmosphere from the photosphere to the top of the chromosphere, as well as the integrated radiative losses in the chromosphere for data observed by the Interface Region Imaging Spectrograph (IRIS). This NASA mission has been observing the Sun and providing, among other kinds of data, multi-line spectral observations sensitive to changes in the lower solar atmosphere since 2013. In this paper, we explain the new inversion tool IRIS$^{2+}$ based on the IRIS$^{2+}$ database, which is based on 135,472 synthetic representative profiles (RP), each of them consisting of 6 chromospheric lines and 6 photospheric lines, their corresponding representative model atmospheres (RMA), and the integrated radiative losses (IRL) associated with these atmospheres. A nearest neighbor (k-nn) model algorithm is trained with the synthetic representative profiles to predict the closest RP in the database to the one observed, at which point IRIS$^{2+}$ assigns the RMA and the IRL to the location of that observed profile. We have compared the results obtained by IRIS$^{2+}$ with results obtained from the state-of-the-art inversion code STiC, which is also used to build the IRIS$^{2+}$ database. We find that the thermodynamics and the IRL obtained with both methods are comparable in most cases. Therefore, IRIS$^{2+}$ is a fast and reliable inversion tool that provides approximate values of the thermodynamic state and the radiative losses in the lower solar atmosphere for a large variety of solar scenes observed with IRIS.
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