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Science 7 December 2007:
Vol. 318. no. 5856, pp. 1597 - 1599
DOI: 10.1126/science.1146337


Twisting Motions of Sunspot Penumbral Filaments
K. Ichimoto, Y. Suematsu, S. Tsuneta, Y. Katsukawa, T. Shimizu, R. A. Shine, T. D. Tarbell, A. M. Title, B. W. Lites, M. Kubo, S. Nagata

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Science. ISSN 0036-8075 (print), 1095-9203 (online)