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Resonant Transmission of Magneto-atmospheric Waves in Sunspot Umbrae

Published online by Cambridge University Press:  13 May 2016

J. Staude ,
J. Rendtel  and
A. Settele
J. Staude
Affiliation:
Astrophysikalisches Institut Potsdam, Sonnenobservatorium Einsteinturm, 14473 Potsdam, Germany
J. Rendtel
Affiliation:
Astrophysikalisches Institut Potsdam, Sonnenobservatorium Einsteinturm, 14473 Potsdam, Germany
A. Settele
Affiliation:
Astrophysikalisches Institut Potsdam, Sonnenobservatorium Einsteinturm, 14473 Potsdam, Germany

Abstract

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We discuss intensity and velocity oscillations which were observed by SOHO in lines of C IV and Ne VIII formed in the EUV plume above a sunspot during a continuous time series of 4.3 hours. Applying a wavelet analysis, we find periods mainly around 3 mHz; the behavior in time is different for the different EUV lines and strongly intermittent, for the velocity oscillations in particular. Moreover, we discuss the observed oscillations within the frame of model calculations for the resonant transmission of magneto-atmospheric waves through realistic models of the sunspot atmosphere. The nonstationary behavior could hint at the appearance of blinkers in the umbral transition region.

Type
Session III: Active Region Structure and Dynamics
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 320 - 323
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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