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| Paper: |
Chromospheric and Photospheric Activity of the Sun as a Star Using SOLSTICE Data |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
584 |
| Authors: |
Catalano, S.; Lanza, A. F.; Brekke, P.; Rottman, Gary J.; Hoyng, P. |
| Abstract: |
The distribution of photospheric and chromospheric active regions (spots and plages) on the surface of stars is mainly recovered from the deconvolution of light or line flux curves. Here we check the reliability of the maximum entropy technique to derive surface maps from the rotational modulation of the continuum and line fluxes observed in active stars. We compare the solar chromospheric map obtained from the deconvolution of daily average of the C 2 line flux at 133.5 nm measured by SOLSTICE, and solar Hα images contemporaneously obtained at Catania observatory. Hα plages may not exactly overlay C 2 plages, however the agreement between the reconstructed and the direct images is strikingly good. Only small (<20circ-30circ in diameter) or low contrast (Delta I/I < 0.3) structures are not recovered. We use also the Wolf sunspot number to study the longitude distribution of the active regions in photosphere and chromosphere, contrasting the solar behaviour with that of other active stars. |
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