The TIMED/SEE Mission

The Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) mission is studying the influences of the Sun and humans on the least explored and understood region of Earth's atmosphere - the Mesosphere and Lower Thermosphere/Ionosphere (MLTI). The MLTI region is a gateway between Earth's environment and space, where the Sun's energy is first deposited into Earth's environment. Solar EUV Experiment (SEE) makes daily measurements of the full-disk solar vacuum ultraviolet (VUV) irradiance to specify the sources of energy into the MLTI. SEE consists of two instruments, the EUV Grating Spectrograph (EGS) and the XUV Photometer System (XPS). The EGS is a Rowland-circle grating spectrograph that makes solar extreme ultraviolet (EUV) and Far Ultraviolet (FUV) spectral irradiance measurements ranging from approximately 27-190 nm. The XPS spectral range is from 0.1 to 35 nm with each photometer having a spectral bandpass of 5 to 10 nm.


Data level definitions


Level 2 EGS

The EUV Grating Spectrograph (EGS) Level 2 irradiance data is time averaged over the entire day, after being 1-AU corrected and removing flares. The spectrum is sampled in 0.1 nm wavelengths bins, but the instrument resolution is approximately 0.4 nm.

SEE L2 EGS [ spectral | time series ]

SEE L2A EGS



Level 2 XPS

The X-ray ultraviolet (XUV) Photometer System (XPS) Level 2 irradiance data is time averaged over the entire day, after being 1-AU corrected and removing flares.

SEE L2 XPS [ time series ]

SEE L2A XPS



Level 3

SEE Level 3 data files contain one daily averaged solar irradiance spectrum in 1 nm intervals extracted from the EGS Level 2 and XPS Level 2 data products.

SEE L3 [ spectral | time series | lines | diodes ]



Level 3A

SEE Level 3A data files contain each measurement's averaged solar irradiance spectrum in 1 nm intervals extracted from the EGS Level 2A and XPS Level 2A data products. Observations are limited by the instrument field of view to approximately 3-minutes once per orbit.

SEE L3A [ time series | lines | diodes ]



Level 4 XPS Model

The XPS Level 4 irradiance data is a spectral model that is driven by the XPS photometer #1 and the GOES XRS flare temperature. Interested users are strongly encouraged to review the additional model details in the README.txt file.

  • Level 4 XPS (Daily) - Daily averaged XPS L4 data products
  • Level 4A XPS (Orbit) - Observation averaged XPS L4 data products

SEE L4 [ spectral | time series ]

SEE L4A [ time series ]



Flare catalog:

This page is a catalog of flare events observed by TIMED-SEE. Each row contains NOAA SWPC flare information from the daily edited event reports for periods when TIMED-SEE was observing the sun anywhere between the start and stop times of these events. Events have been filtered to exclude periods when no appreciable increases were detected by SEE.

View SEE Flare Catalog



* For FTP access to individual files visit the SEE Main Data Page.