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

Data

Data Access Summary

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	3	?			IDL
	TIM	6-Hourly	All	N/A	3	3	?			IDL
Spectral Solar Irradiance (SSI)	SIM	Daily	200-2400nm	Varies 1-34nm	3	9	?			IDL
	SIM	12-Hourly	200-2400nm	Varies 1-34nm	3	9	?			IDL

	text file
	zipped text file
	IDL save file
	netCDF File
	Interactive

Reading Data Files

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

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

The following command is an example of how to read the netCDF file in IDL:

• IDL> L3S=(ncdf_parse(“tsis_ssi_L3_c24h_latest.nc”,/read)).tostruct(/recursive)

Note for Python users reading the netCDF file:

1. 1. The xarray package does not properly decode Julian dates into datetimes. Users should include the `decode_times=False` in the xarray.open_dataset call to keep the timestamps in Julian dates.
   2. When using the netCDF4. num2date or cftime. num2date functions to convert the time column to a time stamp, users should provide the flag has_year_zero=True to properly convert timestamps to datetimes.

Quick Overview

The TSIS-1 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-1 data products are available for public access. TSIS-1 data may be accessed from three different locations:

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

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 website, 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 intended to provide added convenience to end-users. Configuration management of data is built into the TSIS data system, owing to the integration of the TSIS data processing and dissemination components.