SUMER Spectral Atlas

(W. Curdt)

 The SUMER solar-disk spectral atlas by Curdt et al. (A&A, in press, 2001) includes profiles of the average quiet Sun (black), an equatorial coronal hole (blue), and a sunspot (red). More Than 1100 emission lines are indicated by a mark, the measured wavelength in angstrom (Å), and the identification, if available. The marks point to line lists available in the literature, where additional information about a specific line can be found. Squares point to Feldman et al. (ApJS 113, 195, 1997), circles to Curdt et al. (A&AS 126, 281, 1997), diamonds to Kelly (J. Phys. Chem. Ref. Data 16, 1, 1987), Cohen et al. (ApJS 37, 393, 1978), or Sandlin et al. (ApJS 61, 801, 1986). Triangles are new lines or identifications. Filled symbols denote lines observed in first order of diffraction, open symbols are second-order lines. Only the three least-significant digits of the wavelength values are given. If available, unidentified lines are characterized by the temperature classification a: below 3 105 K, b: approx. 3 105 K, c: approx. 4 105 K, d: 6 105 to 9 105 K, e: approx. 1.4 106 K, f: approx. 1.8 106 K. The vertical axis is scaled to mW sr¯¹ m¯² ů¹; on the left the radiometric calibration for the first order lines is given, on the right for second order lines. Note that second-order lines are always superimposed on a first-order background. We have taken care of the type of photocathode (bare or KBr) when applying the radiometric calibration to different sections of the spectrum. We also display in green the BN/CI ratio, which is a useful parameter for electron temperature classification.
Spectra and a continously updated line list are available at
A HTML version of the line list is available at

Since the images may not be suitable for screen resolution, we provide them as Postscript files (60 to 150 KB size) for colour printers, each of them containing two pages: