Flow around sunspots from p-mode frequency shift measurements

Ming Tsung Sun*, Dean Yi Chou, Chia Hsien Lin, Tao Mo Mu, Said Loudagh, B. Bala, I. Jen Huang, Antonio Jimenez, Maria Cristina Rabello-Soares, Guoxiang Ai, Gwo Ping Wang, Harold Zirin, William Marquette, Shuhrat Ehgamberdiev, Shukur Khalikov

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

5 Scopus citations


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.

Original languageEnglish
Pages (from-to)59-65
Number of pages7
JournalSolar Physics
Issue number1
StatePublished - 1997


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