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  • SIM Data Availability
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• Total Solar Irradiance Data
  • TSI Data File Summary
  • TSIS TIM Data Products Release Notes
  • TSIS Total Solar Irradiance Plots

Data

Data Access Summary

• Science Data Product Guide (pdf)
• Algorithm Theoretical Basis Document (ATBD) (pdf)
• Available Data Summary
• Reading Data Files
• Quick Overview
• Data Product Characteristics
• Science Data Processing
• Release Notes: TIM, SIM

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TSIS-1 TIM 2023-11-02 Update: V04 released.

TSIS-1 SIM 2023-10-21 Update

TSIS-1 SIM operations were resumed on 2023-10-21, following a successful recovery from an instrument anomaly. Following instrument checkout, we will resume science data production as soon as possible.

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TSIS-1 SIM V11 L3 Data

V11 is an “off-cycle” release due to an issue with the V10 prism
degradation corrections. The issue relates to increased prism
degradation, due to increased solar activity during the Solar Cycle 25
maximum, that cannot be corrected using the current degradation models.
V11 uses the actual measured degradations, instead of fits to the
measured degradations at wavelengths shorter than 800 nm for data
acquired on, or after, 21 Jan. 2023. The next data release, V12, will be
an on-cycle release that provides a more permanent, and improved,
solution to the dynamic prism degradation rates.

Users should expect slightly higher noise shortward of 800 nm, after 21 Jan. 2023 in the V11 data release.

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Available Data Summary

Data Product	Instr.	Time Cadence	Spectral Coverage	Spectral Resolution	Level	Ver.	Data Info	Full Mission Data Download Files	Interactive Access	File Readers (Listed by Language)
Total Solar Irradiance (TSI)	TIM	Daily	All	N/A	3	4	?			IDL
	TIM	6-Hourly	All	N/A	3	4	?			IDL
Spectral Solar Irradiance (SSI)	SIM	Daily	200-2400nm	Varies 1-34nm	3	11	?			IDL
	SIM	12-Hourly	200-2400nm	Varies 1-34nm	3	11	?			IDL

	text file
	zipped text file
	zipped IDL save file
	Interactive

Reading Data Files

The following reader is available for the data files in the table above:

• TSI and SSI Level 3 text file reader (code in IDL)

Quick Overview

The TSIS instrument suite produces two primary data products: Total Solar Irradiance (TSI) and Solar Spectral Irradiance (SSI) from 200 nm to 2400 nm. TSI data products are formulated using measurements made by the TSIS TIM instrument, and are available in both daily average and 6-hourly average formats. The SSI data product is comprised of measurements made by the TSIS SIM from 200-2400 nm.

TSIS data products are available for public access. TSIS data may be accessed from three different locations:

Location		URL	Content
TSIS Web Site	Primary	This web page (table above)	Full product documentation and direct downloads
LISIRD Web Site	Alternate	http://lasp.colorado.edu/lisird/	Solar irradiance data from TSIS and other missions via interactive tools and common interfaces
GES DISC	Archive	https://disc.gsfc.nasa.gov/datasets?project=TSIS	Archived Level 0 and science products

Refinement of data processing algorithms and some on-orbit characterization of the TSIS instruments continue. Please read the release notes on the TSI and the SSI web pages for detailed quality information about the products you may be interested in.

Data Product Characteristics

Characteristic	Total Solar Irradiance (TSI)	Solar Spectral Irradiance (SSI)
Coverage	Full Solar disk	Full Solar disk
Temporal Characteristics	6-Hourly and Daily	12-Hourly Daily
Spectral Coverage	All wavelengths	200-2400 nm
Spectral Resolution	Total Solar Irradiance	Instrument and wavelength dependent, 34 nm for SIM at 2000 nm
Key Geophysical Parameters	Total Solar Irradiance	Incoming Solar Irradiance
Absolute Accuracy (Relative Standard Uncertainty, 1 sigma)	0.01% (100 parts per million)	Varies per spectral region, Please see TSIS Instrument Overview for measurement objectives and the SSI web page for current status.
Relative Accuracy	0.001% (10 ppm) per year	Varies with spectral region, Please see TSIS Instrument Overview for measurement objectives and the SSI web page for current status.

Science Data Processing

The TSIS Science Data System (SDS) performs all science data production activities. It consists of the hardware and software components necessary to generate, manage, and distribute all TSIS standard science data products. The TSIS SDS routinely produces total solar irradiance and solar spectral irradiance data products on a daily basis. The Science Data System utilizes raw spacecraft and instrument telemetry, routinely-maintained calibration data, and other ancillary information to produce and distribute a variety of data products that have been corrected for all known instrumental and operational effects.

Data processing is performed automatically with the production of data through Level 3 two to fourteen days after the data has been downlinked from the spacecraft, allowing for telemetry retransmissions and, in the case of SSI, time to collect complete spectral scans. TSI and SSI data products are made available to the public immediately after they are produced by the data processing system, following automated quality checks.

The data products are available by direct download or interactive access on the LISIRD Interactive Data Access web site, and are formally delivered to the GES DISC on a daily basis for long-term archival. Dissemination of TSIS data products via the TSIS website at LASP enhances convenience for users as data access methods are tailored to those most functional for retrieving TSIS solar irradiance data. The TSIS project at LASP indexes and maintains a full archive of data products, making possible various and flexible data access interfaces that are intended to provide added convenience to end-users. Configuration management of data is built into the TSIS data system, owing to integration of the TSIS data processing and dissemination components.