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Direct Solar Viewing Calibration Concept for Future CERES, GERB or Libera Type Earth Orbital Climate Missions

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  • 1 Zedika Solutions LLC, Fort Wayne, IN, USA
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Abstract

Better predictions of global warming can be enabled by tuning legacy and current computer simulations to Earth Radiation Budget (ERB) measurements. Since the 1970’s, such orbital results exist, and the next generation instruments such as one called “Libera” are in production. Climate communities have requested that new ERB observing system missions like these, have calibration accuracy obtaining significantly improved calibration SI traceability and stability. This is to prevent untracked instrument calibration drifts, that could lead to false conclusions on climate change. Based on experience from previous ERB missions, the alternative concept presented here utilizes directly viewing solar calibration, for cloud size Earth measurement resolution at <1% accuracy. However it neglects complex already used calibration technology like solar diffusers and on-board lights, allowing new lower cost/risk un-considered spectral characterizing concepts to be introduced for today’s technology. Also in contrast to near future ERB concepts already being produced, this enables in-flight wavelength dependent calibration of Earth observing telescopes using direct solar views, through narrow-band filters continuously characterized on-orbit.

Corresponding author address: G. Matthews, Zedika Solutions LLC, Fort Wayne, IN, USA. E-mail: grant.matthews@zedikasolv.com, grant.matthews@gmail.com

Abstract

Better predictions of global warming can be enabled by tuning legacy and current computer simulations to Earth Radiation Budget (ERB) measurements. Since the 1970’s, such orbital results exist, and the next generation instruments such as one called “Libera” are in production. Climate communities have requested that new ERB observing system missions like these, have calibration accuracy obtaining significantly improved calibration SI traceability and stability. This is to prevent untracked instrument calibration drifts, that could lead to false conclusions on climate change. Based on experience from previous ERB missions, the alternative concept presented here utilizes directly viewing solar calibration, for cloud size Earth measurement resolution at <1% accuracy. However it neglects complex already used calibration technology like solar diffusers and on-board lights, allowing new lower cost/risk un-considered spectral characterizing concepts to be introduced for today’s technology. Also in contrast to near future ERB concepts already being produced, this enables in-flight wavelength dependent calibration of Earth observing telescopes using direct solar views, through narrow-band filters continuously characterized on-orbit.

Corresponding author address: G. Matthews, Zedika Solutions LLC, Fort Wayne, IN, USA. E-mail: grant.matthews@zedikasolv.com, grant.matthews@gmail.com
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