Share Email Print
cover

Proceedings Paper • new

The compact spectral irradiance monitor flight demonstration mission
Author(s): Erik Richard; Dave Harber; Ginger Drake; Joel Rutkowsi; Zach Castleman; Matthew Smith; Jacob Sprunck; Wengang Zheng; Paul Smith; Melanie Fisher; Alan Sims; Beth Cervelli; Maxwell Fowle; Marc Miller; Michael Chambliss; Thomas Woods; Peter Pilewskie; Christopher Yung; Michelle Stephens; Nathan Tomlin; Malcolm White; John Lehman
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper 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.

Paper Details

Date Published: 30 August 2019
PDF: 20 pages
Proc. SPIE 11131, CubeSats and SmallSats for Remote Sensing III, 1113105 (30 August 2019); doi: 10.1117/12.2531268
Show Author Affiliations
Erik Richard, Univ. of Colorado Boulder (United States)
Dave Harber, Univ. of Colorado Boulder (United States)
Ginger Drake, Univ. of Colorado Boulder (United States)
Joel Rutkowsi, Univ. of Colorado Boulder (United States)
Zach Castleman, Univ. of Colorado Boulder (United States)
Matthew Smith, Univ. of Colorado Boulder (United States)
Blue Canyon Technologies (United States)
Jacob Sprunck, Univ. of Colorado Boulder (United States)
Wengang Zheng, Univ. of Colorado Boulder (United States)
Paul Smith, Univ. of Colorado Boulder (United States)
Melanie Fisher, Univ. of Colorado Boulder (United States)
Alan Sims, Univ. of Colorado Boulder (United States)
Beth Cervelli, Univ. of Colorado Boulder (United States)
Maxwell Fowle, Univ. of Colorado Boulder (United States)
Marc Miller, Univ. of Colorado Boulder (United States)
Michael Chambliss, Univ. of Colorado Boulder (United States)
Thomas Woods, Univ. of Colorado Boulder (United States)
Peter Pilewskie, Univ. of Colorado Boulder (United States)
Dept. of Atmospheric and Oceanic Sciences (United States)
Christopher Yung, National Institute of Standards and Technology (United States)
Michelle Stephens, National Institute of Standards and Technology (United States)
Nathan Tomlin, National Institute of Standards and Technology (United States)
Malcolm White, National Institute of Standards and Technology (United States)
Univ. of Colorado Boulder (United States)
John Lehman, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 11131:
CubeSats and SmallSats for Remote Sensing III
Thomas S. Pagano; Charles D. Norton; Sachidananda R. Babu, Editor(s)

© SPIE. Terms of Use
Back to Top