Physics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..368t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 368-385.
Physics
45
Solar Atmosphere, Solar Oscillations, Solar Spectra, Sunspots, Chromosphere, Photosphere, Solar Magnetic Field, Solar Physics
Scientific paper
High resolution spectra consisting of at least 1 hr periods were obtained of the sunpost atmosphere. The Ca II H and K lines were scanned to characterize umbral oscillations and flashes. The former displayed peaks lasting 150-197 sec, while penumbral oscillations peaked in the 197-300 sec range. Quiet sun oscillations exhibited no peaks under 300 sec. The Ca II K line umbral flashes were ubiquitous for all observational periods and were associated with light bridges in the umbra. Magnetic field, vertical velocity, and chromospheric intensity measurements taken during the 1 hr scans covered moving magnetic features (MMF), which traversed the moats around sunspots. MMF areas increased while the magnetic field intensity decreased with MMF movement away from a sunspot. Bright Ca II K line wings were apparent in the MMFs, but cores of the lines were not observed, suggesting that flux loops generating the line are low in the photosphere.
Cram Lawrence E.
Nye Alan H.
Thomas Jordan H.
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