Development of Active Regions: Flows, Magnetic-Field Patterns and Bordering Effect
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- 作者：A. V. Getling ; R. Ishikawa ; A. A. Buchnev
- 关键词：Velocity fields ; photosphere ; Magnetic fields ; Active regions ; Sunspots
- 刊名：Solar Physics
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：291
- 期：2
- 页码：371-382
- 全文大小：2,899 KB
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R. Ishikawa (2)
A. A. Buchnev (3)
1. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, 119991, Russia
2. Hinode Science Center, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan
3. Institute of Computational Mathematics and Mathematical Geophysics, Novosibirsk, 630090, Russia - 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Astronomy
Extraterrestrial Physics and Space Sciences
Astrophysics - 出版者：Springer Netherlands
- ISSN：1573-093X
文摘
A qualitative analysis is given of the data on the full magnetic and velocity vector fields in a growing sunspot group, recorded nearly simultaneously with the Solar Optical Telescope on the Hinode satellite. Observations of a young bipolar subregion developing within AR 11313 were carried out on 9 – 10 October 2011. Our aim was to form an idea about the consistency of the observed pattern with the well-known rising-tube model of the formation of bipolar active regions and sunspot groups. We find from our magnetograms that the distributions of the vertical [\(B_{\mathrm {v}}\)] and the horizontal [\(B_{\mathrm {h}}\)] component of the magnetic field over the area of the magnetic subregion are spatially well correlated; in contrast, the rise of a flux-tube loop would result in a qualitatively different pattern, with the maxima of the two magnetic-field components spatially separated: the vertical field would be the strongest where either spot emerges, while the maximum horizontal-field strengths would be reached in between them. A specific feature, which we call the bordering effect, is revealed: some local extrema of \(B_{\mathrm {v}}\) are bordered with areas of locally enhanced \(B_{\mathrm {h}}\). This effect suggests a fountainlike spatial structure of the magnetic field near the \(B_{\mathrm {v}}\) extrema, which is also hardly compatible with the emergence of a flux-tube loop. The vertical-velocity field in the area of the developing active subregion does not exhibit any upflow on the scale of the whole subregion, which should be related to the rising-tube process. Thus, our observational data can hardly be interpreted in the framework of the rising-tube model.