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Abstract: We discuss observations of the weak first overtone CO absorption band near2300 nm with the U.S. National Solar Observatory Array Camera NAC, a modernmid-infrared detector. This molecular band provides a thermal diagnostic thatforms lower in the atmosphere than the stronger fundamental band near 4600 nm.The observed center-to-limb increase in CO line width qualitatively agrees withthe proposed higher temperature shocks or faster plasma motions higher in theCOmosphere. The spatial extent of chromospheric shock waves is currently at orbelow the diffraction limit of the available C0 lines at existing telescopes.Five minute period oscillations in line strength and measured Doppler shiftsare consistent with the p-mode excitation of the photospheric gas. We also showrecent efforts at direct imaging at 4600 nm. We stress that futurelarge-aperture solar telescopes must be teamed with improved, dynamicmid-infrared instruments, like the NAC, to capitalize on the features thatmotivate such facilities.



Autor: T.A. Schad, M.J. Penn

Fuente: https://arxiv.org/







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