Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334.1054l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 1054-1065.
Astronomy and Astrophysics
Astrophysics
27
Chromosphere, Penumbras, Photosphere, Solar Atmosphere, Solar Oscillations, Sunspots, Line Spectra, Solar Magnetic Field, Stellar Atmospheres, Stellar Magnetic Fields
Scientific paper
This paper presents a new analysis of observations of penumbral magneto-atmospheric oscillations in which both the spatial and temporal behavior are measured simultaneously in two spectral lines (Fe I λ5434 and Ca II λ8498) formed at widely separated heights in the atmosphere. The spatial distribution of the amplitude of oscillation indicates that the velocity perturbations are aligned with the magnetic field (1) in the inner penumbra at photospheric heights, and (2) in the outer penumbra at chromospheric heights. In the outer penumbra, it is found that the p-modes with their usual frequencies around ν = 3 mHz are the dominant feature of the oscillatory spectrum at photospheric heights, but oscillations of much lower frequencies are dominant in the chromosphere.
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