Dynamic phenomena in the chromospheric umbra and penumbra of a sunspot

Alissandrakis, C. E.; Dialetis, D.; Macris, C. J.

doi:10.1007/BFb0022427

Dynamic phenomena in the chromospheric umbra and penumbra of a sunspot

C. E. Alissandrakis¹,
D. Dialetis² &
C. J. Macris²

Session 4. The Surface Fine Structure as a Probe of the Solar Interior
Conference paper
First Online: 01 January 2005

121 Accesses
1 Citations

Part of the book series: Lecture Notes in Physics ((LNP,volume 233))

Abstract

We observed a prominent, short lived (70 sec) umbral flash in Ha with the 50 cm “Tourelle” refractor at Pic du Midi. The main component of the flash was small (1″ by 0.5″) with a maximum intensity 25% above the background. It occurred in a region which showed irregular intensity variations. Umbral oscillations were observed in an adjacent region and running penumbral waves around part of the superpenumbra.

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Authors and Affiliations

Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, 15771, Athens, Greece
C. E. Alissandrakis
Astronomical Institute, National Observatory of Athens, 11810, Athens, Greece
D. Dialetis & C. J. Macris

Authors

C. E. Alissandrakis
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D. Dialetis
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C. J. Macris
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Richard Muller

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Alissandrakis, C.E., Dialetis, D., Macris, C.J. (1985). Dynamic phenomena in the chromospheric umbra and penumbra of a sunspot. In: Muller, R. (eds) High Resolution in Solar Physics. Lecture Notes in Physics, vol 233. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0022427

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DOI: https://doi.org/10.1007/BFb0022427
Published: 10 June 2005
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-15678-9
Online ISBN: 978-3-540-39608-6
eBook Packages: Springer Book Archive

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