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arXiv 0907.1643astro-ph.SR
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2008年8月1日日食太阳最小日冕解开

The 2008 August 1 Eclipse Solar-Minimum Corona Unraveled

Jay M. Pasachoff, Vojtech Rusin, Miloslav Druckmuller, Peter Aniol, Metod Saniga, Milan Minarovjech

摘要:

我们讨论的白光和[Fe XIV]发射日冕观测期间的日全食2008年8月1日,在蒙古(Altaj地区)和俄罗斯(Akademgorodok,新西伯利亚,西伯利亚)的结果。对应于目前的极端太阳极小期,白光日冕,可见达20个太阳半径,是一个短暂的类型与明显的头盔流光位于一个位置角48,130,241和322度的双折射链上方。在两极周围可以看到各种各样的冕洞,里面充满了一些细小的极地羽流。进一步的原始方法的图像处理,恒星高达12等,一个克鲁兹族彗星(C/2008 O 1),和一个日冕物质抛射(CME)也被检测到,与最小的可分辨的结构是,在某些地方甚至小于1角秒。即使我们的站点之间有19分钟的时间差,也可以看到日冕和日冕中的差异,可能是运动。除了显示连续日冕的高分辨率日冕图像外,(K-日冕),由光球光的电子散射产生,重叠的绿色发射线的图像(530.3nm,[Fe XIV])电晕,并利用两个窄带滤光片进行了研究(分别以线本身为中心和对于529.1nm附近的连续谱),每个具有0.15nm的FWHM。通过太阳观测,我们咨询了太阳和日光层天文台,Hinode的XRT和SOT,TRACE和STEREO,以及Wilcox太阳天文台和SOHO/MDI磁图,我们将我们的日食观测放在当前异常低和延长的太阳极小期的背景下。

英文摘要:

We discuss results stemming from observations of the white-light and [Fe XIV] emission corona during the total eclipse of the Sun of 2008 August 1, in Mongolia (Altaj region) and in Russia (Akademgorodok, Novosibirsk, Siberia). Corresponding to the current extreme solar minimum, the white-light corona, visible up to 20 solar radii, was of a transient type with well-pronounced helmet streamers situated above a chain of prominences at position angles 48, 130, 241 and 322 degrees. A variety of coronal holes, filled with a number of thin polar plumes, were seen around the poles. Furthering an original method of image processing, stars up to 12 magnitude, a Kreutz-group comet (C/2008 O1), and a coronal mass ejection (CME) were also detected, with the smallest resolvable structures being of, and at some places even less than, 1 arcsec. Differences, presumably motions, in the corona and prominences are seen even with the 19-min time difference between our sites. In addition to the high-resolution coronal images, which show the continuum corona (K-corona) that results from electron scattering of photospheric light, images of the overlapping green-emission-line (530.3 nm, [Fe XIV]) corona were obtained with the help of two narrow-passband filters (centered on the line itself and for the continuum in the vicinity of 529.1 nm, respectively), each with FWHM of 0.15 nm. Through solar observations, on whose scheduling and details we consulted, with the Solar and Heliospheric Observatory, Hinode's XRT and SOT, TRACE, and STEREO, as well as Wilcox Solar Observatory and SOHO/MDI magnetograms, we set our eclipse observations in the context of the current unusually low and prolonged solar minimum.

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