The Influence of Solar Flares on the Lower Solar Atmosphere: Evidence from the Na D Absorption Line Measured by GOLF/SOHO
The Influence of Solar Flares on the Lower Solar Atmosphere: Evidence from the Na D Absorption Line Measured by GOLF/SOHO
复制标题
太阳耀斑对太阳低层大气的影响：来自 GOLF/SOHO 测量的 Na D 吸收线的证据
DOI：
10.1007/s11207-010-9549-9
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发表时间：
2010
期刊：
影响因子：
2.8
通讯作者：
P. Boumier
中科院分区：
文献类型：
--
作者：
G. Cessateur;M. Kretzschmar;T. Dudok de Wit;P. Boumier
据推测，太阳耀斑对太阳大气的最深层有影响，但这种影响的观测证据很少。使用SOHO上GOLF测量的Na D1和Na D2夫朗霍夫线十年的测量结果，我们表明这条光球线确实受到耀斑的影响。个别耀斑的影响被太阳振荡所掩盖，但基于条件平均的统计分析揭示了一个清晰的信号。虽然GOLF只能探测一个单一的波长在同一时间，我们表明，两翼的钠线仍然可以比较。变化的线不对称性可以解释为在耀斑的峰值期间，来自低层太阳大气的向上的等离子体运动，随后是向下的运动。
Solar flares presumably have an impact on the deepest layers of the solar atmosphere and yet the observational evidence for such an impact is scarce. Using ten years of measurements of the Na D1 and Na D2 Fraunhofer lines, measured by GOLF onboard SOHO, we show that this photospheric line is indeed affected by flares. The effect of individual flares is hidden by solar oscillations, but a statistical analysis based on conditional averaging reveals a clear signature. Although GOLF can only probe one single wavelength at a time, we show that both wings of the Na line can nevertheless be compared. The varying line asymmetry can be interpreted as an upward plasma motion from the lower solar atmosphere during the peak of the flare, followed by a downward motion.