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Phase Relations and Other Diagnostics of Solar Atmospheric Structure and Dynamics

Published online by Cambridge University Press:  08 February 2017

Franz - Ludwig Deubner
Franz - Ludwig Deubner*
Affiliation:
Astronomisches Institut der Universität Würzburg, D - 97074 Würzburg, Germany

Abstract

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Based on spectral observations with high spatial and temporal resolution, we discuss in this brief review the dynamic behaviour of the upper layers of the quiet solar atmosphere. A proper description of this behaviour is fundamental for the understanding (and simulation) of the temperature structure and the heating of the chromosphere, and the interpretation of such conspicuous phenomena like the chromospheric “grains”. The evidence is drawn from waveforms, power spectra, and phase spectra of velocity and brightness fluctuations in numerous Fraunhofer lines formed over an extended radial range of the atmosphere. A comparison with recent predictions of simulation calculations documents the strong need to extend the simulation codes to 3-D, and also to incorporate a realistic chromosphere/coronal transition layer, to better reproduce the observations.

Type
VII. The Solar Atmosphere
Information
Symposium - International Astronomical Union , Volume 185: New Eyes to See Inside the Sun and Stars , 1998 , pp. 427 - 434
Copyright
Copyright © Kluwer 1998 

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