Sunspot Transition Region Oscillations in NOAA 8156 | Zendy

N. Brynildsen | Zendy; T. Leifsen | Zendy; O. KjeldsethMoe | Zendy; P. Maltby | Zendy; K. Wilhelm | Zendy

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Sunspot Transition Region Oscillations in NOAA 8156

Author(s) -

N. Brynildsen,

T. Leifsen,

O. KjeldsethMoe,

P. Maltby,

K. Wilhelm

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311854

Subject(s) - transition (genetics) , sunspot , geography , physics , meteorology , geology , chemistry , quantum mechanics , magnetic field , biochemistry , gene

Based on observations obtained with the Solar and Heliospheric Observatory -SOHO joint observing program for velocity fields in sunspot regions, we havedetected 3 min transition region umbral oscillations in NOAA 8156. Simultaneousrecordings of O V $\lambda$629 and N V $\lambda$1238, $\lambda$1242 with theSUMER instrument give the spatial distribution of power in the 3 minoscillations, both in intensity and line-of-sight velocity. Comparing loci withthe same phase we find that the entire umbral transition region oscillates. Theobserved maxima in peak line intensity are nearly in phase with the maxima invelocity directed towards the observer. We discuss the suggestion that thewaves are upward propagating acoustic waves.Comment: 6 pages, 5 figure

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