Radiometric flight results from the HyperSpectral Imager for Climate
Greg Kopp1, Paul Smith1, Chris Belting1, Ginger Drake1, Joey Espejo1, Karl Heuerman1, James Lanzi2, and Dave Stuchlik21Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303, USA 2NASA Wallops Flight Facility, Wallops Island, VA 23337, USA
Received: 10 Nov 2016 – Accepted for review: 28 Nov 2016 – Discussion started: 16 Dec 2016
Abstract. Long-term monitoring of the Earth-reflected solar-spectrum is necessary for discerning and attributing changes in climate. High radiometric-accuracy enables such monitoring over decadal timescales with non-overlapping instruments, and high precision enables trend detection on shorter timescales. The Hyperspectral Imager for Climate Science (HySICS) is a visible and near-infrared spatial/spectral imaging-spectrometer intended to ultimately achieve ~ 0.2 % radiometric accuracies of Earth scenes from space, providing an order-of-magnitude improvement over existing space-based imagers. On-orbit calibrations from measurements of spectral solar irradiances acquired by direct views of the Sun enable radiometric calibrations with superior long-term stability than currently possible with any manmade spaceflight light-source or detector. Solar- and lunar-observations enable in-flight focal-plane-array flat-fielding and other instrument calibrations. The HySICS has demonstrated this solar cross-calibration technique for future spaceflight instrumentation via two high-altitude balloon flights. The second of these two flights acquired high radiometric-accuracy measurements of the ground, clouds, the Earth's limb, and the Moon. Those results and the details of the uncertainty analyses of those flight data are described.
Kopp, G., Smith, P., Belting, C., Drake, G., Espejo, J., Heuerman, K., Lanzi, J., and Stuchlik, D.: Radiometric flight results from the HyperSpectral Imager for Climate
Science (HySICS), Geosci. Instrum. Method. Data Syst. Discuss., doi:10.5194/gi-2016-37, in review, 2016.