Small-scale topology of solar atmospheric dynamics

We use high-quality observations from the Dunn Solar Telescope at NSO/Sacramento Peak to study spatio-temporal co-location of acoustic flux events in the photosphere and internetwork grains in the chromosphere. The events are diagnosed as sites with excess upward-propagating five-minute waves measur...

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Published inAstronomy and astrophysics (Berlin) Vol. 390; no. 2; pp. 681 - 690
Main Authors Hoekzema, N. M., Rimmele, T. R., Rutten, R. J.
Format Journal Article
LanguageEnglish
Published EDP Sciences 01.08.2002
Subjects
Sun: chromosphere
Sun: oscillations
Sun: photosphere
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Summary:We use high-quality observations from the Dunn Solar Telescope at NSO/Sacramento Peak to study spatio-temporal co-location of acoustic flux events in the photosphere and internetwork grains in the chromosphere. The events are diagnosed as sites with excess upward-propagating five-minute waves measured from Dopplergrams. The grains are repetitive bright internetwork features in simultaneous $\ion{Ca}{ii}$ K2V filtergrams. We find that the largest-flux sites in the granulation have appreciably larger than random probability to co-locate with exceptionally bright chromospheric internetwork grains, at an average delay of about two minutes which is likely to represent sound travel time to the chromosphere. This finding strengthens the case for acoustic grain excitation.
Bibliography:other:2002A%26A...390..681H
ark:/67375/80W-ZMC6NCKJ-T
publisher-ID:aah3441
istex:EDC5CC065149CAAE9FD9F0CF5423FFF37F5AF025
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361:20020636