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OSCILLATIONS ABOVE THE UMBRA OF SUNSPOTS

机译:太阳黑子上面的振荡

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Oscillations above thirteen sunspots are investigated with the Coronal Diagnostic Spectrometer (CDS) and the Transition Region And Coronal Explorer (TRACE). The CDS observations give knowledge about the oscillations in the chromosphere, transition region, and corona and information regarding the contributions of different emission lines to the TRACE 171 °A and 195 °A channel intensities. A period close to 3 min is observed above the umbra of each sunspot. The observations give support to the idea that the 3 min oscillations are caused by upwardly propagating acoustic waves. This is evident from the asymmetry of the oscillation amplitudes in the red and blue wings of the emission lines, where the oscillations are decidedly more pronounced in the blue than in the red line wing. Additional support for the acoustic wave hypothesis emerges from the agreement between the observed and predicted relations in phase and magnitude between the oscillations in intensity and line-ofsight velocity. The frequency of the oscillations is above the acoustic cutoff frequency in the umbral atmosphere and the observed phase differences between lines emitting at different temperatures point to an upwardly propagating disturbance.
机译:用日冕诊断光谱仪(CDS)和过渡区和日冕探测器(TRACE)研究了13个黑子以上的振荡。 CDS观测可提供有关色球,过渡区和电晕振荡的知识,以及有关不同发射线对TRACE 171°A和195°A通道强度的影响的信息。在每个黑子的本影上方观察到接近3分钟的时间。这些观察结果支持了3分钟的振荡是由向上传播的声波引起的想法。从发射线的红色和蓝色机翼中的振荡幅度的不对称性可以明显看出这一点,其中,与红色的机翼相比,蓝色中的振荡明显更为明显。对声波假设的进一步支持来自强度和视线速度振荡之间相位和大小的观测和预测关系之间的一致性。振荡的频率高于本影气氛中的声截止频率,并且观察到的在不同温度下发射的线之间的相位差指示向上传播的干扰。

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