SOR3TSID: Daily Total Solar Irradiance Measurements

SOR3TSID Version 019 is the final and definitive version of this solar constant dataset, superseding all prior releases. It provides daily-averaged total solar irradiance data across the full wavelength spectrum, normalized to one astronomical unit. The data originates from the Total Irradiance Monitor instrument, designed for an absolute accuracy of 100 parts per million and a long-term relative accuracy of 10 ppm per year.

Use Cases

• Modeling Earth's climate and energy budget based on precise solar constant measurements.
• Tracking long-term solar variability and its potential impact on climate change.
• Calibrating satellite instruments and atmospheric models using a highly accurate reference dataset.
• Studying the Sun-Earth connection by analyzing changes in incident sunlight over time.

Strengths

• Represents the final, authoritative version (V019) of the data product.
• Provides high-precision measurements with a designed absolute accuracy of 100 ppm and long-term relative accuracy of 10 ppm per year.
• Contains the full mission record in each product delivery for user convenience.

Limitations

• Column names and specific data structure are not provided in the available metadata.
• There is a conflict in reported freshness: one source lists a last update in 2026, while another lists 2020.
• The exact temporal coverage (start and end dates) of the mission data is not specified.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Collected by the Total Irradiance Monitor (TIM) instrument, an ambient temperature active cavity radiometer.

Freshness

Last updated dates conflict: 2026-04-09 (datagov) and 2020-02-25 (nasa_earthdata).