Georgakilas, A.A. and Christopoulou, E.B. and Koutchmy, S. (2002) Oscillations and waves related to sunspots. Il nuovo cimento C, 25 (5\6). pp. 601-608. ISSN 1826-9885
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Abstract
In order to study umbral oscillations, running penumbral waves and the relationship between them, we analyzed CCD, high-resolution, sunspot observations obtained at the center and the wings of the Hα line and the Fe I 5576 ˚A line using a UBF filter. We produced “space/time slice images” which show that there is not a clear relationship between umbral oscillations and running penumbral waves as they observed in upper chromospheric layers. We found that the running penumbral waves are observable at least up to the formation height of the Hα±0.5 ˚A line, but not in the Hα±0.75 ˚A or the Fe I±0.12 ˚A. The correlation between umbral oscillations at various atmospheric heights and running penumbral waves strongly indicates that the latter are excited by photospheric umbral oscillations and not the chromospheric ones.
| Item Type: | Article |
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| Additional Information: | Paper presented at the International Meeting on THEMIS and the New Frontiers of Solar Atmosphere Dynamics, Rome, Italy, March 19-21, 2001. |
| Uncontrolled Keywords: | Chromosphere and chromosphere-corona transition; spicules ; Image processing (including source extraction) ; Conference proceedings |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 12 Mar 2020 14:59 |
| Last Modified: | 12 Mar 2020 14:59 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/14852 |
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