从自由旋转的高空气球对2026年8月12日日偏食进行直接成像与基于梯度的分析
Direct Imaging and Gradient-Based Analysis of the 12 August 2026 Partial Solar Eclipse from a Freely Rotating High-Altitude Balloon
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中文总结 AI 辅助
本研究通过自由旋转高空气球搭载Insta360 ONE RS相机对日偏食观测，用二维梯度法分析图像获定量食分，验证被动旋转可实现半定量日食观测并定义校准策略。
中文摘要 AI 辅助
我们报告一项概念验证观测：利用从德国北部奥尔登堡发射的自由旋转高空气球，对2026年8月12日的日偏食开展观测。载荷搭载两台配备4K Boost广角镜头的Insta360 ONE RS相机，镜头覆盖取自BRESSER日食观测镜的滤光材料。以ISO 800、1/1000秒的参数每10秒拍摄间隔照片，共获得约1300张图像，其中21张包含日食太阳的直接可见图像，覆盖中欧夏令时19:19:15至20:38:21，包含当地食甚的两侧。为验证能否从这些小型、非稳定广角图像中恢复定量日食信息，采用二维基于梯度的太阳边缘分析估算可见太阳面积，并归一化至首次观测值。图像推导的食分与独立计算的日食几何形状符合度良好，皮尔逊相关系数r=0.959，平均绝对差为9.5个百分点，均方根误差（RMSE）为11.5个百分点。系统偏差与未校准的运动相机系统的局限性一致，包括点扩散函数、视场相关的镜头响应、滤光片几何及相机间差异。结果表明，被动载荷旋转无需主动太阳指向即可产生视觉有用且半定量的直接日食观测结果，并为未来气球载日食测量定义了校准策略。
英文摘要
We report a proof-of-concept observation of the partial solar eclipse of 12 August 2026 using a freely rotating high-altitude balloon launched from Oldenburg, northern Germany. The payload carried two Insta360 ONE RS cameras equipped with 4K Boost wide-angle lenses; covered by filter material taken from a BRESSER eclipse viewing glass. Interval photographs were acquired every 10 s at ISO 800 and 1/1000 s. Of approximately 1,300 images, 21 contained a directly visible image of the eclipsed Sun, spanning 19:19:15-20:38:21 CEST and both sides of the local eclipse maximum. To test whether quantitative eclipse information could be recovered from these small, non-stabilized wide-angle images, the visible solar area was estimated using a two-dimensional gradient-based solar edge analysis and normalized to the first observation. The image-derived obscuration followed the independently calculated eclipse geometry with Pearson r = 0.959, a mean absolute difference of 9.5 percentage points, and an RMSE of 11.5 percentage points. Systematic deviations are consistent with the limitations of an uncalibrated action-camera system, including point-spread function, field-dependent lens response, filter geometry, and camera-to-camera differences. The results demonstrate that passive payload rotation can yield both visually useful and semi-quantitative direct eclipse observations without active solar pointing, and define a calibration strategy for future balloon-borne eclipse measurements.
