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arXiv 0903.4039astro-ph.SR
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三维日冕慢波模式:走向三维地震学

3D Coronal Slow Modes: Towards 3D Seismology

M. S. Marsh, R. W. Walsh, S. Plunkett

摘要:

2008年1月10日,日地关系观测台A和B号航天器使用极紫外成像仪对日冕进行了高时间节奏研究,目的是调查日冕动力学。观测了活动区日冕环内波的三维传播,并测量了真实的日冕慢模速度。强度振荡的周期约为12分钟,观察到向外传播的环路系统的基础,与慢磁声模式。本文采用一种新的分析方法,对A、B航天器的观测数据进行了波相速度的测量。这些立体观测被用来推断波传播的三维速度矢量,与当地法线的倾角为37 ± 6度,震级为132 ± 9和132 ± 11 km s-1,首次测量了真正的日冕纵向慢模速度,推断温度为0.84 ± 12 MK和0.84 ± 15 MK。

英文摘要:

On 2008 January 10, the twin Solar Terrestrial Relations Observatory (STEREO) A and B spacecraft conducted a high time cadence study of the solar corona with the Extreme UltraViolet Imager (EUVI) instruments with the aim of investigating coronal dynamics. Observations of the three-dimensional propagation of waves within active region coronal loops and a measurement of the true coronal slow mode speed are obtained. Intensity oscillations with a period of approximately 12 minutes are observed to propagate outwards from the base of a loop system, consistent with the slow magnetoacoustic mode. A novel analysis technique is applied to measure the wave phase velocity in the observations of the A and B spacecraft. These stereoscopic observations are used to infer the three-dimensional velocity vector of the wave propagation, with an inclination of 37 +- 6 deg to the local normal and a magnitude of 132 +- 9 and 132 +- 11 km s-1, giving the first measurement of the true coronal longitudinal slow mode speed, and an inferred temperature of 0.84 +- 12 MK and 0.84 +- 15 MK.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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