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Flow around sunspots from it p-mode frequency shift measurements

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Abstract

We use five-day helioseimic data from the Taiwan Oscillation Network to study the flow around a sunspot, NOAA 7887. The p-mode oscillations in an annular region centered at the sunspot are decomposed into the modes propagating toward and away from the sunspot. We find that the frequency of an outgoing mode is greater than that of the corresponding incoming mode. This indicates that the plasma is flowing outward from the sunspot. The outflow velocity is estimated to be about 40–80 m s-1.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chang-Gung College of Medicine and Technology, Kwei-San, Taiwan, R.O.C

    Ming-Tsung Sun

  2. Physics Department, Tsing Hua University, Hsinchu, 30043, Taiwan, R.O.C

    Dean-Yi Chou, Chia-Hsien Lin & The TON Team

Authors
  1. Ming-Tsung Sun
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  2. Dean-Yi Chou
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  3. Chia-Hsien Lin
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  4. The TON Team
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Sun, MT., Chou, DY., Lin, CH. et al. Flow around sunspots from it p-mode frequency shift measurements. Solar Physics 176, 59–65 (1997). https://doi.org/10.1023/A:1004927811123

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