Gold Level L2 Solar EUV proxy

The GOLD solar irradiance proxy (QEUV) is a proxy for the integrated solar EUV
irradiance below 45 nm, which can be derived directly from far ultraviolet (FUV) radiance
measurements. QEUV is a dayside disk data product, derived from the GOLD DAY measurement mode.

Algorithm heritage
The disk QEUV retrieval algorithm was originally developed for use with GUVI and SSUSI images
(Strickland et al., [1995]). The GOLD implementation of this algorithm takes advantage of GOLD’s
ability to transmit the full spectrum to maximize the signal-to-noise ratio and eliminate atomic
emission lines that contaminate the N2 LBH bands (e.g., N I 149.3 nm). This algorithm has been
extensively documented and applied (e.g., Strickland et al. [2004]; Evans et al., [1995]). The
associated GOLD Level 2 data product is called QEUV.

References
-Evans, J. S., D. J. Strickland and R. E. Huffman (1995), Satellite remote sensing of thermospheric
O/N2 and solar EUV: 2. Data analysis, J. Geophys. Res., Vol. 100, NO. A7, pages 12,227-12,233.
-Strickland, D. J., J. S. Evans, and L. J. Paxton (1995), Satellite remote sensing of thermospheric
O/N2 and solar EUV: 1. Theory, J. Geophys. Res., 110, A7, pages 12,217-12,226.
-Strickland, D. J., J. L. Lean, R. R. Meier, A. B. Christensen, L. J. Paxton, D. Morrison, J. D.
Craven, R. L. Walterscheid, D. L. Judge, and D. R. McMullin, (2004), Solar EUV irradiance variability
derived from terrestrial far ultraviolet dayglow observations, Vol. 31, L03801, doi:10.1029/2003GL018415.