THE PROMINENCE – CORONA AND THE FILAMENT – CORONA TRANSITION REGION: IS THERE ANY DIFFERENCE? |
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| Authors: | Chiuderi Drago F Landi E |
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| Institution: | (1) Department of Astronomy and Space Science, University of Florence, Largo E. Fermi 5, 50125 Firenze, Italy;(2) Naval Research Laboratory, 4555 Overlook Avenue S.W., Washington DC, 20375-5320, U.S.A |
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| Abstract: | The ratio between the Extreme Ultraviolet emission of the prominence–corona transition region and that of the quiet Sun (QS) transition region is measured using observations from the CDS and SUMER instruments on board the SOHO Satellite. These results are compared with those obtained in an earlier paper, analysing the same prominence as a filament on the disk. Theoretical models predict a difference in the emission of the prominence–corona transition region when it is observed at the limb and on the disk as a filament; the aim of the present work is to provide an observational check of this difference. SUMER and CDS data provide fairly good agreement if the prominence intensity measured by SUMER is compared with the average quiet-Sun intensity, measured near the disk center; the prominence intensity relative to the average quiet-Sun level measured on the same rasters results in disagreement with CDS, due to the smaller size of the disk portion and to the very strong limb brightening present in SUMER rasters. The relative prominence to quiet-Sun intensity ratio varies from 0.2 to 0.4, depending on the line formation temperature. This value leads to a discrepancy with the results obtained in a previous study when the same prominence was observed as a filament. This discrepancy indicates that the prominence–corona transition region emission is different when emitted by different sides of the prominence. |
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