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Reversed granulation in mid-photosphere of the Sun

Published online by Cambridge University Press:  01 August 2006

Katja Janssen  and
Gianna Cauzzi
Katja Janssen
Affiliation:
INAF Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy email: kjanssen@arcetri.astro.it
Gianna Cauzzi
Affiliation:
INAF Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy email: kjanssen@arcetri.astro.it
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Abstract

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Reversed granulation is predicted by numerical simulations and has been observed in the wings of chromospheric lines. Here we present reversed granulation in high spatial, spectral and temporal resolution, extracted from the photospheric Fe I 7090.4 Å line core intensities, once taking into account the velocity effects. Correlations with the continuum are studied in terms of smoothing, time delay and temporal evolution. The latter appears to be superimposed with an oscillatory signal that suggests the presence of gravity waves in the mid-photosphere.

Keywords

Sun: photosphereSun: chromosphereSun: granulationSun: oscillations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 163 - 165
Copyright
Copyright © International Astronomical Union 2007

References

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