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Full catalog/TSIS_TSI_L3_24HR
TSIS_TSI_L3_24HR·v05·dataset

Total energy the Sun sends Earth, daily average

TSIS TIM Level 3 Total Solar Irradiance 24-Hour Means V05 (TSIS_TSI_L3_24HR) at GES DISC
heliosphere NASA GES_DISC Level 3 active
In plain English

What it measures. The total amount of energy the Sun delivers to Earth across all wavelengths, averaged over each full day. Each value is reported as it would appear at a standard Earth-Sun distance.

How it's made. Built from the Total Irradiance Monitor (TIM) instrument on the space-station-mounted TSIS-1 mission, with the raw readings averaged into daily numbers and appended to a running table.

How & where you'd use it. Tracking how the Sun's brightness changes over time, which feeds into climate studies and helps separate solar effects from human-caused warming.

What's measured

SUN-EARTH INTERACTIONS › SOLAR ACTIVITY › SOLAR IRRADIANCE › TOTAL SOLAR IRRADIANCE

Coverage & cadence

  • Time span2018-01-10 → ongoing
  • Measured byTSIS-1 (TIM)
  • Processing levelLevel 3
  • StatusACTIVE

What you can do with it

  • Monitor solar activity and space weather
  • Track flares, the solar wind and geomagnetic storms
Official description

Version 05 is the current release of this data product, and supercedes all previous versions. The TSIS TIM Level 3 Total Solar Irradiance (TSI) 24-Hour Means data product (TSIS_TSI_L3_24HR) uses measurements from the Total Irradiance Monitor (TIM) instrument over the entire spectrum, and averages them over a 24-hour period. TSIS-1 was launched on December 15, 2017 and mounted on the International Space Station (ISS) on December 30, 2017. TIM instrument has long-term repeatability with estimated uncertainties less than 0.014 W/m^2/yr (10 ppm/yr). Accuracy is currently reported as 0.48 W/m^2 (350 ppm), but expected to decrease as calibrations are refined and incorporated. Irradiances are reported at a mean solar distance of 1 AU and zero relative line-of-sight velocity with respect to the Sun. All of the data from this product are arranged into a single file in a tabular ASCII text format which can be easily read into a spreadsheet application. New data are appended to the file on a daily basis. The columns contain the date, Julian day, minimum wavelength, maximum wavelength, instrument mode, data version number, irradiance value, irradiance uncertainty, and data quality. The rows are arranged with data at each wavelength over the full TIM wavelength range, repeating for each day for the length of the mission.

Get the data

tsis_tsi_l3_24hr_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="TSIS_TSI_L3_24HR",
    version="05",
    bounding_box=(-122.5, 37.2, -121.8, 37.9),  # your area (W,S,E,N)
    temporal=("2024-01-01", "2024-12-31"),       # your dates
)
files = earthaccess.open(results)   # stream straight from GES_DISC
Browsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.