Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-05-20
Solar Physics, 263, 153-162, 2010
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
13 pages, 7 figures
Scientific paper
10.1007/s11207-010-9549-9
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 D$_{1}$ and Na D$_2$ 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.
Boumier Patrick
Cessateur Gaël
Dudok de Wit Thierry
Kretzschmar Matthieu
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