Title: Radio dimming associated with filament eruptions in the meter and decimeter wavebands Show Chinese title

Title: 与米波和分米波段的丝状体爆发相关的射电亮度减弱

Abstract: Filament eruptions are considered to be a common phenomenon on the Sun and other stars, yet they are rarely directly imaged in the meter and decimeter wavebands. Using imaging data from the DAocheng solar Radio Telescope (DART) in the 150-450 MHz frequency range, we present two eruptive filaments that manifest as radio dimmings (i.e., emission depressions). Simultaneously, portions of these eruptive filaments are discernible as dark features in the chromospheric images. The sun-as-a-star flux curves of brightness temperature, derived from the DART images, exhibit obvious radio dimmings. The dimming depths range from 1.5% to 8% of the background level and show a negative correlation with radio frequencies and a positive correlation with filament areas. Our investigation suggests that radio dimming is caused by free-free absorption during filament eruptions obscuring the solar corona. This may provide a new method for detecting stellar filament eruptions. Show Chinese abstract

Abstract: 日冕物质抛射被认为是太阳和其他恒星上的一种常见现象，然而它们在米波和分米波段很少被直接成像观测到。 利用来自150-450 MHz频段的道成太阳射电望远镜（DART）成像数据，我们展示了两个表现为射电消光（即发射减弱）的爆发性日冕物质抛射。 同时，在色球层图像中可以分辨出这些爆发性日冕物质抛射的一部分暗特征。 由DART图像得到的日冕整体亮度温度的射电消光曲线显示出明显的射电消光。 消光深度范围从背景水平的1.5%到8%，与射电频率呈现负相关，与日冕物质抛射面积呈现正相关。 我们的研究表明，射电消光可能是由于日冕物质抛射期间自由-自由吸收效应掩盖了日冕。 这可能为探测恒星日冕物质抛射提供了一种新方法。