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arXiv 1101.4544astro-ph.SR
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视向速度和光度太阳象星日震观测中的振型

Mode visibilities in radial velocity and photometric Sun-as-a-star helioseismic observations

David Salabert, Jerome Ballot, Rafael A. Garcia

摘要:

我们分析了超过5000天的高质量太阳作为一个明星,径向速度GOLF和光度处女座/SPM日震观测提取精确估计的低度p模式和m的高度比的l=2和3的多重峰在太阳声光谱的vibration。的模式vibrations被证明是在高尔夫红翼配置比在蓝翼配置,并减少的VIRGO/SPM通道的波长增加。我们还表明,模式vibrations是独立的太阳活动周期,并保持恒定的整体与时间,但尽管如此,他们遵循短期波动的时间尺度上的几个月。l=1模的可见度也在1999年底显著增加。与理论预测的比较。即使有定性的协议,出现了一些显着的差异,特别是对于l=3模式。光靠临边暗化不能解释振型的相对活跃度。这些精确的估计值应用作提取p-模式参数的参考,用于任何未来使用GOLF和VIRGO/SPM观测的研究。

英文摘要:

We analyze more than 5000 days of high-quality Sun-as-a-star, radial velocity GOLF and photometric VIRGO/SPM helioseismic observations to extract precise estimates of the visibilities of the low-degree p modes and the m-height ratios of the l=2 and 3 multiplets in the solar acoustic spectrum. The mode visibilities are shown to be larger during the GOLF red-wing configuration than during the blue-wing configuration, and to decrease as the wavelength of the VIRGO/SPM channels increases. We also show that the mode visibilities are independent of the solar activity cycle and remain constant overall with time, but that nevertheless they follow short-term fluctuations on a time scale of a few months. The l=1 mode visibility also increases significantly toward the end of the year 1999. Comparisons with theoretical predictions are provided. Even though there is qualitative agreement, some significant discrepancies appear, especially for the l=3 modes. The limb darkening alone cannot explain the relative visibilities of modes. These precise estimates should be used as references for the extraction of the p-mode parameters for any future investigation using the GOLF and VIRGO/SPM observations.

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