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GENERAL INFORMATION
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1. Title of Dataset: TSIS-1 SIM V11 Solar Spectral Irradiance


2. Authors: Penton, Steven V., Chambliss, M., Richard, E., Béland, S., Brooks, K., Charbonneau, L., Coddington, O., Peck, C.,


3. Contact information: steven.penton@lasp.colorado.edu


4. Date of data collection: 2018-03-14 to 2024-01-24


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SHARING/ACCESS INFORMATION
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1. Licenses/restrictions placed on the data: In Copyright - Educational Use Permitted


2. Recommended citation for the data: Penton, Steven V., Chambliss, M., Richard, E., Béland, S., Brooks, K., Charbonneau, L., Coddington, O., Peck, C., (2024). TSIS-1 SIM V11 Solar Spectral Irradiance [Data set]. University of Colorado Boulder, https://doi.org/10.25810/gg0e-zr22.


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DATA & FILE OVERVIEW
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1. File List:

   A. Filename: TSIS_SIM_V11.1_Release_Notes.pdf


   B. Filename: tsis_ssi_L3_c12h_v11_20180314_20240124.nc	


   C. Filename: tsis_ssi_L3_c12h_v11_20180314_20240124.sav


   D. Filename: tsis_ssi_L3_c12h_v11_20180314_20240124.txt.gz	


   E. Filename: tsis_ssi_L3_c24h_v11_20180314_20240124.nc	


   F. Filename: tsis_ssi_L3_c24h_v11_20180314_20240124.sav	


   G. Filename: tsis_ssi_L3_c24h_v11_20180314_20240124.txt.gz	


2. Relationship between files:

	A. tsis_ssi_L3_c12h_v11_20180314_20240124: Contains spectral solar irradiance (SSI) measurements with a 12-hour cadence.


	B: tsis_ssi_L3_c24h_v11_20180314_20240124: Contains spectral solar irradiance (SSI) measurements with a 24-hour cadence.
	
	
	C. TSIS_SIM_V11.1_Release_Notes.pdf: This is the 2nd version (V2) of the V11 release notes.


3. Software-specific information: (Name, version, and operating system for software needed to open each file type.)

   A. .nc: netCDF files can be opened with any standard NetCDF file reader.


   B. .sav: IDL SAVfile files can be opened with any version > 8.3 of the Interactive Data Language (IDL) available from NV5 Geospatial at https://www.nv5geospatialsoftware.com/Products/IDL


   C. .gz: gzip files can be opened with the gzip command (https://www.gnu.org/software/gzip/) and contains the data in .txt format.


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METHODOLOGICAL INFORMATION
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1. Description of methods for data collection or creation:

The TSIS-1 SIM measures SSI (units of W m-2 nm-1) incident on a plane surface at the top of the atmosphere that is normal to the Sun two times per day from 200 to 2400 nm at variable (~2-45 nm) spectral resolution. The integrated irradiance contribution measured by SIM is approximately 96% of the total solar irradiance measured by the TIM instrument. The SIM is a follow-on to the SORCE SIM instrument with improvements in instrument design, relative accuracy (0.2% over the full spectrum), long-term stability (to better than 0.05% per year), and relative precision (0.01%). These improvements are key to understanding the contributions from varying spectral irradiance on climate. Long-term relative accuracy is maintained by duty cycling three independent spectrometers and directly measuring the prism transmission for each.