Abstract:
The SUSIM home page on the WWW is
http://www.nrl.navy.mil/content.php?P=SUSIM .
The Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) on NASA's
Upper Atmosphere Research Satellite (UARS) measures the energy input
to the upper atmosphere by observing the
solar ultraviolet spectral irradiance in the 110 to 410 nm range.
...
The SUSIM measures the full-disk solar irradiance with high-precision
and accuracy to follow short-term and intermediate-term variations in
the solar output. SUSIM consists of two identical double-dispersion
scanning spectrometers, seven detectors (5 photodiodes, 2 photon
counters), and solar ultraviolet calibration sources. One
spectrometer measures the solar disk while the other is for
calibration. SUSIM uses high-precision deuterium lamps calibrated by
NIST. SUSIM's spectral resolution is 0.15 nm over the entire spectral
range using the photon counters and 1 to 5 nm using the photodiodes.
Daily spectral scans are made at 1.0 nm resolution.
Two SUSIM Level 3 data products are produced each day: Level 3AS, and
Level 3BS. The Level 3AS format is common to all UARS solar
instruments. The Level 3BS format is identical to the Level 3AS
format, except that instrument degradation is included in the 3BS data
products. Only the Level 3BS data are available from the GSFC DAAC.
SUSIM_L3BS_DAILY: These data products are produced from the
corresponding Level 3AS data product, and contain 1 nm resolution
SUSIM daily mean gridded irradiances beginning with a wavelength of
115.5 nm to 411.5 nm. In addition, the data product contains the
following solar indices: mean solar distance, H I Lyman alpha, O I
index, C II index, C IV index, Al edge, Mg II index, and the Ca II
index. 
