Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-08-31
Astronomische Nachrichten, Vol. 331, Issue 6, p. 589 (2010)
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
4 pages, 3 figures, Published in Astronomische Nachrichten on behalf of the 1st EAST-ATST Workshop: "Science with Large Solar
Scientific paper
10.1002/asna.201011379
We discuss observations of the weak first overtone CO absorption band near 2300 nm with the U.S. National Solar Observatory Array Camera (NAC), a modern mid-infrared detector. This molecular band provides a thermal diagnostic that forms lower in the atmosphere than the stronger fundamental band near 4600 nm. The observed center-to-limb increase in CO line width qualitatively agrees with the proposed higher temperature shocks or faster plasma motions higher in the COmosphere. The spatial extent of chromospheric shock waves is currently at or below the diffraction limit of the available C0 lines at existing telescopes. Five minute period oscillations in line strength and measured Doppler shifts are consistent with the p-mode excitation of the photospheric gas. We also show recent efforts at direct imaging at 4600 nm. We stress that future large-aperture solar telescopes must be teamed with improved, dynamic mid-infrared instruments, like the NAC, to capitalize on the features that motivate such facilities.
Penn Matt J.
Schad Thomas A.
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