AI 中文总结
该研究利用DEB公民科学项目在2024年日全食观测数据，测量日冕亮度径向剖面、扁平化参数等，对比MHD模型，发现模型与测量结果有差异，未来可通过日冕强度和径向速度测量更严格约束内日冕模型。
AI 中文摘要
动态日食广播（DEB）公民科学项目在2024年4月8日北美各地的日全食期间观测了日冕可见连续体亮度。我们展示了来自11个DEB站点、跨越2700公里距离、显示49分钟演化的结果。这些望远镜的日冕亮度径向剖面在1.2至4.0太阳半径之间紧密相关，与已发表的光度日冕强度相当。测量了1.4至2.8太阳半径的日冕扁平化参数。计算出Ludendorff指数为0.0761±0.0007，但一些人用于计算该指数的外推技术与这种直接测量结果不一致，并提出了替代结构参数。将测量的径向速度与Y. Li等人（2026年）日食期间日冕的MHD模型进行比较。测量到极向下流，平均径向速度为-37±3 km s-1，在与模型一致的速度和位置处减速为14±3 m s-2。在低高度处看到了预测的外流和向下流的混合，以及日冕两个西部地区的外流。观测到的最快外流径向速度为105 km s-1，可能与模型未预测的瞬变事件有关。未来的DEB日食实验可以通过使用日冕强度和径向速度测量来更严格地约束内日冕模型。
英文摘要
The Dynamic Eclipse Broadcast (DEB) Initiative citizen science program observed coronal visible continuum brightness during the 2024 April 8 total eclipse from locations across North America. We present results from 11 DEB sites spanning 2700 km of distance and showing 49 minutes of evolution. The coronal brightness radial profiles from these telescopes are tightly correlated from 1.2 to 4.0 solar radii and comparable to published photometric coronal intensities. The coronal flattening parameter is measured from 1.4 to 2.8 solar radii. A Ludendorff index of 0.0761 +/- 0.0007 is computed but the extrapolation techniques used by some to calculate this index are shown to disagree with this direct measurement, and alternate structure parameters are suggested. Measured radial velocities are compared with an MHD model of the corona during the eclipse from Y. Li et al. (2026). A polar downflow is measured with an average radial velocity of -37 +/- 3 km s-1 and a deceleration of 14 +/- 3 m s-2 at a speed and position which agrees with the model. The predicted mixture of outflows and downflows at low heights is seen, as well as outflows in two western regions of the corona. The fastest observed outflow has a radial speed of 105 km s-1 and is likely associated with a transient event not predicted by the model. Future DEB Initiative eclipse experiments can more tightly constrain models of the inner corona by using both coronal intensity and radial velocity measurements.
Comments17 pages, 4 figures, 1 table
