Abstract
Time series of the nonsplit Fei 7090 Å line have been observed in several sunspots with a 100 x 100 diode array corresponding to 48 arc sec times 1.39 Å. The spatial behaviour of Doppler motions along one fixed slit position has been studied as a function of time. Former results are confirmed, that the power in the five minute range decreases from the photosphere to the umbra, where, however, values still well above the noise level are measured. Regarding the penumbra, the power tends to exhibit a maximum at locations where the line-of-sight component of a radial horizontal field should be maximal. This indicates that the direction of the oscillatory velocities might be influenced by the magnetic field or the Evershed flow. No significant power is found in the 3 min range. An exception might be seen in a small patch at the limb of the umbra of one spot.
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Balthasar, H., Küveler, G. & Wiehr, E. A comparison of the oscillations in sunspot umbrae, penumbrae, and the surrounding photosphere. Sol Phys 112, 37–48 (1987). https://doi.org/10.1007/BF00148485
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DOI: https://doi.org/10.1007/BF00148485