GROUND-BASED DETECTION OF AN INFRARED [SI-X] CORONAL EMISSION-LINE AND IMPROVED WAVELENGTHS FOR THE INFRARED [FE-XIII] EMISSION-LINES

The wavelength of an infrared [Si x] coronal emission line is measured to be 1430.084 +/- 0.006 nm with a coronagraph of the National Solar Observatory at Sacramento Peak. New measurements of the infrared [Fe XIII] emission lines locate the central wavelengths at 1074.617 +/- 0.005 nm and 1079.783 +/- 0.006 nm. The slit-averaged line center intensities were 4.5, 27.8, and 5.2 (in units of 10(-6) B(.)) for the 1430 nm, 1075 nm, and 1080 nm emission lines, respectively. The spatial distribution of [Si x] emission is correlated with the coronal electron density as determined from the [Fe XIII] line ratio. Upper limits are set for coronal emission near 1266 nm and 1523 nm.