New Observations of the IR Emission Corona from the 2019 July 2 Eclipse Flight of the Airborne Infrared Spectrometer
New Observations of the IR Emission Corona from the 2019 July 2 Eclipse Flight of the Airborne Infrared Spectrometer
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DOI：
10.3847/1538-4357/ac6ce8
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发表时间：
2021-06
期刊：
影响因子：
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通讯作者：
J. Samra;C. Madsen;P. Cheimets;E. DeLuca;L. Golub;Vanessa Marquez;Naylynn Tañón Reyes
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文献类型：
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作者：
J. Samra;C. Madsen;P. Cheimets;E. DeLuca;L. Golub;Vanessa Marquez;Naylynn Tañón Reyes
机载红外光谱仪 (AIR-Spec) 在 2017 年日全食期间投入使用，当时它观测到了美国国家科学基金会拥有、国家大气研究中心运营的湾流 V 研究喷气式飞机的 5 条红外日冕发射线。第二次 AIR-Spec 研究飞行是在 2019 年 7 月 2 日横跨南太平洋的日全食期间进行的。 2019 年的日食飞行进行了 7 分钟的观测，在此期间仪器测量了所有四个目标发射线：S xi 1.393 μm、Si x 1.431 μm、S xi 1.921 μm 和 Fe ix 2.853 μm。首次检测到 1.393 μm S xi 线，可能首次检测到 Si xi 1.934 μm 和 Fe x 1.947 μm。 2017 年 AIR-Spec 对 Fe ix 的探测得到证实，并且首次观测到 Fe ix 线强度与太阳半径的函数关系。大地吸收特征用于校准波长映射、仪器展宽和仪器的吞吐量。 AIR-Spec 进行了重大升级，为 2019 年日食观测做准备。热背景降低了 30 倍，信噪比提高了 5.5 倍，后处理指向稳定性提高了 5 倍，达到 <10" rms。此外，还识别并解决了两个成像伪影，提高了光谱分辨率并使 2019 年的数据更易于解释。
The Airborne Infrared Spectrometer (AIR-Spec) was commissioned during the 2017 total solar eclipse, when it observed five infrared coronal emission lines from a Gulfstream V research jet owned by the National Science Foundation and operated by the National Center for Atmospheric Research. The second AIR-Spec research flight took place during the 2019 July 2 total solar eclipse across the south Pacific. The 2019 eclipse flight resulted in seven minutes of observations, during which the instrument measured all four of its target emission lines: S xi 1.393 μm, Si x 1.431 μm, S xi 1.921 μm, and Fe ix 2.853 μm. The 1.393 μm S xi line was detected for the first time, and probable first detections were made of Si xi 1.934 μm and Fe x 1.947 μm. The 2017 AIR-Spec detection of Fe ix was confirmed and the first observations were made of the Fe ix line intensity as a function of solar radius. Telluric absorption features were used to calibrate the wavelength mapping, instrumental broadening, and throughput of the instrument. AIR-Spec underwent significant upgrades in preparation for the 2019 eclipse observation. The thermal background was reduced by a factor of 30, providing a 5.5× improvement in signal-to-noise ratio, and the postprocessed pointing stability was improved by a factor of 5 to <10″ rms. In addition, two imaging artifacts were identified and resolved, improving the spectral resolution and making the 2019 data easier to interpret.