Proceedings ArticleDOI
Compact spectral irradiance monitor flight demonstration mission
Erik Richard,David Harber,Ginger Drake,Joel Rutkowsi,Zach Castleman,Matthew Smith,Jacob Sprunck,W. Zheng,Paul Smith,Melanie Fisher,Alan Sims,Beth Cervelli,Maxwell Fowle,Marc L. Miller,Michael Chambliss,Thomas N. Woods,Peter Pilewskie,C. S. Yung,Michelle Stephens,Nathan A. Tomlin,Malcolm G. White,Malcolm G. White,John H. Lehman +22 more
- Vol. 11131, pp 1113105
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TLDR
The Compact Spectral Irradiance Monitor (CSIM) as discussed by the authors is a two-channel prism spectral radiometer incorporating Si, InGaAs, and extended InGaA focal plane photodiodes to record the solar spectrum daily across a continuous wavelength region spanning 200 − 2800 nm.Abstract:
Accurate, long-term solar spectral irradiance (SSI) measurements are vital for interpreting how solar variability impacts Earth’s climate and for validating climate model sensitivities to spectrally varying solar forcing. The Compact Spectral Irradiance Monitor (CSIM) 6U CubeSat successfully launched on Dec. 3rd, 2018 as part of the SpaceX SSO-A: SmallSat Express Mission ultimately achieving a sun-synchronous 575 km orbit. CSIM brings new, emerging technology advancements to maturation by demonstrating the unique capabilities of a complete SSI mission with inherent low mass and compact design. The instrument is a compact, two-channel prism spectral radiometer incorporating Si, InGaAs, and extended InGaAs focal plane photodiodes to record the solar spectrum daily across a continuous wavelength region spanning 200 – 2800 nm (>97% of the total solar irradiance). A new, novel electrical substitution radiometer (ESR) using vertically aligned carbon-nanotube (VACNT) bolometers serves as an absolute detector for periodic on-orbit spectral calibration corrections. Pre-launch component level performance characterizations and final instrument end-to-end absolute calibration achieved low combined standard uncertainty (uc<0.5%) in irradiance. These calibrations were performed in the LASP Spectral Radiometer Facility (SRF), a comprehensive spectral irradiance calibration facility utilizing a tunable laser system tied to an SI-traceable cryogenic radiometer. On-orbit, optical degradation corrections to better than 0.05% / year uncertainty are achieved by comparing periodic, simultaneous solar measurements of the two CSIM channels operating with significantly different solar exposure duty cycles. Operational overlap of CSIM with existing SSI measurements validate concepts for maintaining critical long-term solar data records.read more
Citations
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Journal ArticleDOI
The TSIS-1 Hybrid Solar Reference Spectrum
Odele Coddington,Erik Richard,David Harber,Peter Pilewskie,Thomas N. Woods,Kelly Chance,Xiaofeng Liu,Kang Sun +7 more
TL;DR: A new solar irradiance reference spectrum representative of solar minimum conditions between solar cycles 24 and 25 is presented by applying a modified spectral ratio method to normalize very high spectral resolution solar line data to the absolute irradiance scale of the TSIS‐1 Spectral Irradiance Monitor (SIM) and the CubeSat Compact SIM (CSIM).
Journal ArticleDOI
The Emerging Technological Revolution in Earth Observations
Graeme L. Stephens,Anthony Freeman,Erik Richard,Peter Pilewskie,Philip Larkin,Clara Chew,Simone Tanelli,Shannon Brown,Derek J. Posselt,Eva Peral +9 more
TL;DR: A technology revolution in Earth observation sensor design is occurring as mentioned in this paper, associated with the emergence of CubeSat platforms that have forced a de facto standardization of the design of Earth observation sensors.
Journal ArticleDOI
Overview of microfabricated bolometers with vertically aligned carbon nanotube absorbers
Nathan A. Tomlin,C. S. Yung,Zach Castleman,M. Denoual,Ginger Drake,N. Farber,David Harber,Karl Heuerman,Greg Kopp,H. Passe,Erik Richard,Joel Rutkowski,Jacob Sprunck,Michelle Stephens,Cameron J. E. Straatsma,S. Van Dreser,Igor Vayshenker,Malcolm G. White,Malcolm G. White,Solomon I. Woods,W. Zheng,John H. Lehman +21 more
TL;DR: In this article, a wide variety of micro-fabricated bolometers with carbon nanotubes (VACNTs) are presented, ranging from cryogenic optical power primary standards to room temperature satellite-based solar irradiance monitors and broadband infrared microbolometers.
Journal ArticleDOI
Solar-Cycle Variability Results from the Solar Radiation and Climate Experiment (SORCE) Mission
TL;DR: The SORCE solar-variability results include comparisons of the solar irradiance observed during Solar Cycles 23 and 24 and the solar-cycle minima levels in 2008 - 2009 and 2019 - 2020 as discussed by the authors .
Proceedings ArticleDOI
Compact total irradiance monitor flight demonstration
David Harber,Zach Castleman,Ginger Drake,Samuel Van Dreser,Nat Farber,Karl Heuerman,Marc L. Miller,Joel Rutkowski,Alan Sims,Jacob Sprunck,Cameron J. E. Straatsma,Isaac Wanamaker,W. Zheng,Greg Kopp,Erik Richard,Peter Pilewskie,Nathan A. Tomlin,Michelle Stephens,C. S. Yung,Malcolm G. White,Malcolm G. White,John H. Lehman +21 more
TL;DR: The Compact Total Irradiance Monitor (CTIM) is a CubeSat instrument that will demonstrate next-generation technology for monitoring total solar irradiance as mentioned in this paper, which includes novel silicon-substrate room temperature vertically aligned carbon nanotube (VACNT) bolometers.
References
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