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[ Site by **Jeffrey Hall**
| Research funded by **NSF** ]

ARTICLE

The spectral coverage of the SSS is not complete due to the small size of the CCDs in use from 1993-2007 (TEK 512x512). However, the echelle is configured to cover as many of the traditional activity proxies as possible, including Mg b, H&alpha, Na D, and the 8498 and 8542 lines of the Ca II infrared triplet. The single Ca II H&K order (the straight blue line in the order map plot below) encompasses the reference bandpasses of the Mount Wilson HKP-2 instrument, allowing us to calculate *S* directly from our data, as well as to derive it via established procedures.

The SSS data frame includes twenty 512-pixel orders with the following wavelength coverage (all wavelengths are in Ångstroms). The bandpasses are listed in the order they appear in the plot below (i.e., with the longest wavelengths at top). The order numbers are merely relative. In terms of the actual diffraction orders, Mg b is in order 43, H&alpha order 34, and the IRT order 26. Squares and triangles on the plot below indicate order trace positions used by the reduction software.

Order 19: 8815.54 - 8973.73

Order 18: 8477.14 - 8629.25

Order 17: 8163.17 - 8309.65

Order 16: 7871.63 - 8012.87

Order 15: 7600.19 - 7736.57

Order 14: 7346.85 - 7478.68

Order 13: 7109.86 - 7237.43

Order 12: 6887.67 - 7011.26

Order 11: 6678.96 - 6798.80

Order 10: 6482.52 - 6598.83

Order 09: 6297.30 - 6410.29

Order 08: 6122.37 - 6232.23

Order 07: 5956.91 - 6063.79

Order 06: 5800.14 - 5904.22

Order 05: 5651.42 - 5752.83

Order 04: 5510.14 - 5609.01

Order 03: 5375.74 - 5472.20

Order 02: 5247.75 - 5341.91

Order 01: 5125.71 - 5217.68

Order 00: 3858.43 - 4011.82

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