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Oscillations in sunspot umbra, -penumbra and the surrounding photosphere

Published online by Cambridge University Press:  03 August 2017

H. Balthasar ,
E. Fangmeier ,
G. Küveler  and
E. Wiehr
H. Balthasar
Affiliation:
Universitäts-Sternwarte, Geismarlandstraße 11, D-3 400 Göttingen, Fed. Rep. Germany
E. Fangmeier
Affiliation:
Universitäts-Sternwarte, Geismarlandstraße 11, D-3 400 Göttingen, Fed. Rep. Germany
G. Küveler
Affiliation:
Universitäts-Sternwarte, Geismarlandstraße 11, D-3 400 Göttingen, Fed. Rep. Germany
E. Wiehr
Affiliation:
Universitäts-Sternwarte, Geismarlandstraße 11, D-3 400 Göttingen, Fed. Rep. Germany

Abstract

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Doppler shifts of the nonsplit line Fe I 7090Å have been measured simultaneously in the sunspot umbra, penumbra and the photosphere using a 100 × 100 diode array. The power in the range 2.5–4.5 mHz is found to decrease from the photosphere towards the umbra. Besides the minimum at the center of the umbra, further power minima occur at the transition region between umbra and penumbra. No significant power is found in the range 5.0–6.0 mHz.

Type
Chapter 2: Theory of Solar Oscillations
Information
Symposium - International Astronomical Union , Volume 123: Advances In Hello- and Asteroseismology , 1988 , pp. 183 - 186
Copyright
Copyright © Reidel 1988 

References

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