TSIS_SSI_L3_24HR: Daily Solar Spectral Irradiance from the ISS

TSIS-1, launched in 2017, measures the Sun's output with an absolute uncertainty of about 0.2%. This dataset provides daily-averaged solar spectral irradiance from 200 to 2400 nanometers, collected by the Spectral Irradiance Monitor on the International Space Station. Data is stored in a single, growing ASCII file with rows for each wavelength per day.

Use Cases

• Modeling atmospheric photochemistry based on high-resolution spectral irradiance inputs.
• Tracking long-term solar variability for climate studies using the daily time-series.
• Validating other solar irradiance instruments against the SIM's reported uncertainty.
• Analyzing spectral features across the 200-2400 nm range for specific scientific investigations.

Strengths

• Provides high-precision measurements with a stated absolute uncertainty of about 0.2%.
• Offers broad spectral coverage from 200 to 2400 nm at resolutions from 2 to 45 nm.
• Data is appended daily, creating a continuous record from the mission's start in 2017.

Limitations

• Sources conflict on the current version (Version 14 vs. Version 13).
• Key metadata like row count, file size, and specific license details are unavailable.
• The single-file, append-only ASCII format may become cumbersome for long-term analysis.

Provenance

Source

Spectral Irradiance Monitor (SIM) instrument on the TSIS-1 mission, hosted on the International Space Station.

Collection Method

Daily 24-hour averages of solar spectral measurements.

Time Range

From December 2017 onward, for the length of the mission.

Freshness

2026-04-09 21:19:49.413217

Geography

Solar measurements taken from Earth orbit, reported at 1 Astronomical Unit.