Inference of subsurface magnetic field of sunspots from absorption coefficients of p-modes in sunspots
2010104010013 物理系 The interaction of p-mode waves with an active region can be described by a phenomenological parameter, hereafter called the interaction parameter. The measured absorption coefficients of p-modes relate to the interaction parameter by Chou et al.'s an integral equation. We ass...
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ftnthuniv:oai:nthur.lib.nthu.edu.tw:987654321/54747 2023-05-15T18:22:43+02:00 Inference of subsurface magnetic field of sunspots from absorption coefficients of p-modes in sunspots Huei-Ru Chen;Dean-Yi Chou;the TON Team 周定一 1997 http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/54747 En eng American Astronomical Society Astrophysical Journal, American Astronomical Society, Volume 490, Issue 1, Nov. 1997, Pages 452-457 subsurface magnetic field;sunspots;absorption coefficients;p-modes;active region;interaction parameter 33 Journal 1997 ftnthuniv 2014-12-17T20:56:05Z 2010104010013 物理系 The interaction of p-mode waves with an active region can be described by a phenomenological parameter, hereafter called the interaction parameter. The measured absorption coefficients of p-modes relate to the interaction parameter by Chou et al.'s an integral equation. We assume that the sunspot is axisymmetric and the interaction parameter is uniform in the horizontal direction inside the sunspot. The depth dependence of the sunspot radius is given in our study. Thus, the problem becomes one-dimensional: to determine the interaction parameter versus depth. We use the optimally localized averages method to invert the absorption coefficients, measured with the Taiwan Oscillation Network data and South Pole data, to infer the interaction parameter versus depth. For two sunspots we have studied, the depth dependences of the interaction parameter are similar: the interaction parameter increases rapidly, as depth increases, to a maximum value at a depth of about of 7 Mm, and then gradually drops to zero at a depth of about 28-35 Mm. The distribution of the interaction parameter also depends on the depth variation of sunspot radius in such a way that the interaction parameter anticorrelates with the sunspot radius. Journal/Newspaper South pole National Tsing Hua University Institutional Repository (NTHUR) South Pole |
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National Tsing Hua University Institutional Repository (NTHUR) |
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English |
topic |
subsurface magnetic field;sunspots;absorption coefficients;p-modes;active region;interaction parameter 33 |
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subsurface magnetic field;sunspots;absorption coefficients;p-modes;active region;interaction parameter 33 Huei-Ru Chen;Dean-Yi Chou;the TON Team Inference of subsurface magnetic field of sunspots from absorption coefficients of p-modes in sunspots |
topic_facet |
subsurface magnetic field;sunspots;absorption coefficients;p-modes;active region;interaction parameter 33 |
description |
2010104010013 物理系 The interaction of p-mode waves with an active region can be described by a phenomenological parameter, hereafter called the interaction parameter. The measured absorption coefficients of p-modes relate to the interaction parameter by Chou et al.'s an integral equation. We assume that the sunspot is axisymmetric and the interaction parameter is uniform in the horizontal direction inside the sunspot. The depth dependence of the sunspot radius is given in our study. Thus, the problem becomes one-dimensional: to determine the interaction parameter versus depth. We use the optimally localized averages method to invert the absorption coefficients, measured with the Taiwan Oscillation Network data and South Pole data, to infer the interaction parameter versus depth. For two sunspots we have studied, the depth dependences of the interaction parameter are similar: the interaction parameter increases rapidly, as depth increases, to a maximum value at a depth of about of 7 Mm, and then gradually drops to zero at a depth of about 28-35 Mm. The distribution of the interaction parameter also depends on the depth variation of sunspot radius in such a way that the interaction parameter anticorrelates with the sunspot radius. |
author2 |
周定一 |
format |
Journal/Newspaper |
author |
Huei-Ru Chen;Dean-Yi Chou;the TON Team |
author_facet |
Huei-Ru Chen;Dean-Yi Chou;the TON Team |
author_sort |
Huei-Ru Chen;Dean-Yi Chou;the TON Team |
title |
Inference of subsurface magnetic field of sunspots from absorption coefficients of p-modes in sunspots |
title_short |
Inference of subsurface magnetic field of sunspots from absorption coefficients of p-modes in sunspots |
title_full |
Inference of subsurface magnetic field of sunspots from absorption coefficients of p-modes in sunspots |
title_fullStr |
Inference of subsurface magnetic field of sunspots from absorption coefficients of p-modes in sunspots |
title_full_unstemmed |
Inference of subsurface magnetic field of sunspots from absorption coefficients of p-modes in sunspots |
title_sort |
inference of subsurface magnetic field of sunspots from absorption coefficients of p-modes in sunspots |
publisher |
American Astronomical Society |
publishDate |
1997 |
url |
http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/54747 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
Astrophysical Journal, American Astronomical Society, Volume 490, Issue 1, Nov. 1997, Pages 452-457 |
_version_ |
1766202131043319808 |