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Link to SUSIM UARS
home page
Summary:
The Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) is one of 10
instruments aboard the Upper Atmosphere Research Satellite (UARS). Its
primary objective is the daily measurement of the solar UV spectral
irradiance. Data collection began 11 October 1991 and has continued, with a
few interruptions, to the present. SUSIM data have been processed to levels
1, 2, 3AS and 3BS. Currently, SUSIM level 3BS version 20 data products are
available from the Goddard Space Flight Center
(GSFC) Distributed Active Archive Center (DAAC).
Table of Contents:
-
-
-
- UARS SUSIM LEVEL 3BS DAILY SOLAR DATA
-
- SUSIM Level 3BS data are a subset of the UARS dataset. SUSIM
measures solar ultraviolet spectral irradiance at wavelengths between
115 nm and 411 nm to produce approximately 1 nm resolved gridded
irradiances. It uses this and other data to also form and report the
values of 7 solar indices.
-
- The ultimate goal of SUSIM is to measure the near, middle, and
far UV irradiance over a complete 11 year solar cycle.
-
- Solar UV Spectral Irradiance
- Solar UV Indices
-
- The SUSIM Level 3BS data include gridded irradiances representing
1 nm integrations over the whole spectral range and their formal
errors derived from the data and the values of 7 solar indices for
each mission day. Each file consists of three records called SFDU,
LABEL, and DATA. SFDU and LABEL records contain descriptive
information about the instrument and the data. The DATA record
contains the gridded irradiances and their errors followed by
parameter names (seven of which are solar indices) and parameter
values.
-
- The UARS
SOLSTICE level 3BS gridded irradiance data has the same format
and units except the gridded irradiance definitions and the
wavelength coverage are different. While there may be some similarity
in the parameters and solar indices, the SOLSTICE versions of these,
in general, have different definitions and units.
-
-
-
- Name:
- Dr. Guenter Brueckner
- Address:
- Code 7660
- Naval Research Laboratory
- Washington, DC, 20375
- Telephone Numbers:
- Voice: (202) 767-3287
- FAX: (202) 767-5636
- Electronic Mail Address:
- brueckner@susim.nrl.navy.mil
-
- Solar Ultraviolet Spectral Irradiance Monitor
-
- Name:
- Dianne Prinz
- Address:
- Code 7668
- Naval Research Laboratory
- Washington, DC, 20375
- Telephone Numbers:
- Voice: (202) 767-2481
- FAX: (202) 767-5636
- Electronic Mail Address:
-
prinz@susim.nrl.navy.mil
- Name:
- Linton Floyd
- Address:
- Code 7660
- Naval Research Laboratory
- Washington, DC, 20375
- Telephone Numbers:
- Voice: (202) 767-2258
- FAX: (202) 767-5636
- Electronic Mail Address:
- floyd@susim.nrl.navy.mil
-
- The general data gathering technique performed by the SUSIM
Instrument is described in the
SUSIM Whole Data Set Description metafile.
-
-
-
-
-
-
SUSIM is an absolutely calibrated solar ultraviolet dual
dispersion, dual spectrometer instrument. It is mounted on the
UARS Solar Stellar Pointing Platform (SSPP) which normally
tracks the sun for at least 35 minutes throughout each of the
approximately 16 90-minute orbits per day. When illuminated by
the sun, SUSIM measures the solar ultraviolet spectral
irradiance in the 110 to 411 nm wavelength range.
To calibrate the instrument during its long flight, SUSIM
carries four stable deuterium lamps that are periodically
scanned. Additional calibration capability is provided by its
ability to freely substitute different elements in the optical
path. These include entrance filter, entrance slit, primary
grating, secondary grating, exit slit, exit filter, and
detector. SUSIM measurements are taken using pairs of slits
which have 0.15 (narrow), 1.1 (mid) or 5 (wide) nm spectral
bandpasses, using one of eight available primary and secondary
grating pairs) with one of six entrance filters (2 Quartz, 4
MgF2), one of seven exit filters (1 MgF2, 2 Corning, 2 7%
neutral density, 2 15% neutral density) and one of seven
detectors (3 RbTe diodes, 2 bialkali diodes, 1 RbTe
photoncounter, 1 bialkali photoncounter). The four deuterium
lamps can be used matched with each of the eight different
grating pairs. Solar irradiance data are acquired either in
scanning mode, during which the solar irradiance is measured
over a range of wavelengths, or in dwelling mode where the
received irradiance is measured continuously at one selected
wavelength.
-
- Satellite data are collected from a near-circular Earth orbit
of nominal 585 km altitude and 57 degree inclination.
-
- Upper Atmosphere Research Satellite (UARS).
-
- UARS was launched in September 1991 with the mission of
investigating the chemistry, dynamics, and energy inputs of the
Earth's upper atmosphere. See the UARS Project
and UARS
Platform documents for more information.
-
- Data are telemetered from UARS through the Tracking and Data Relay
Satellite System (TDRSS) to the Data Capture Facility (DCF) at NASA GSFC.
There the data are given an initial quality check, and are then forwarded
to the UARS Central Data Handling Facility (CDHF).The instrument PI teams
are connected to the CDHF through remote analysis computers (RACs), where
they have developed software to convert the raw data to higher level
processed data. The CDHF uses the production software to convert the
level 0 data to level 1, 2, 3AS, and 3BS data. The Goddard DAAC acquires
the UARS data from the CDHF.
-
-
-
- The user is referred to the SUSIM metadata
documents for any problems with the data. Further questions may
be answered by contacting the SUSIM team at the addresses listed
above.
-
-
-
-
-
- 115 nm to 411 nm.
-
- The resolution is that of the SUSIM instrument function
convolved with the completely resolved full-disk solar spectrum.
The SUSIM instrument function is approximately a triangle having
a FWHM of 1.1 nm.
-
- All SUSIM Level 3BS data are gridded every nm on the half
nm.
-
-
-
-
Temporal coverage is from 11 October 1991 to the present. The
GSFC DAAC currently has the first 7 years of SUSIM level 3BS
data (to 8 August 1998). Not all days are represented in the
dataset, usually due to spacecraft problems. Listed below are
the dates within the above period for which SUSIM data are not
available:
03-JUN-1992 to 10-JUL-1992
14-JUL-1992 to 19-JUL-1992
17-SEP-1992
16-MAR-1993
17-APR-1993 to 19-APR-1993
05-AUG-1993 to 10-AUG-1993
18-SEP-1993 to 22-SEP-1993
03-OCT-1993 to 04-OCT-1993
16-MAR-1994
24-MAR-1995 to 25-MAR-1995
27-MAR-1995 to 28-MAR-1995
30-MAR-1995 to 06-APR-1995
18-APR-1995 to 19-APR-1995
17-MAY-1995 to 24-MAY-1995
30-JUN-1995 to 02-JUL-1995
30-JUL-1995 to 01-AUG-1995
08-SEP-1995 to 09-SEP-1995
15-SEP-1995
14-OCT-1995 to 19-OCT-1995
29-NOV-1995
27-DEC-1995 to 28-DEC-1995
03-FEB-1996 to 13-FEB-1996
05-MAR-1996 to 06-MAR-1996
08-MAY-1996 to 10-MAY-1996
14-MAY-1996
22-JUL-1996 to 30-JUL-1996
02-SEP-1996 to 04-SEP-1996
10-NOV-1996
31-MAY-1997
11-SEP-1997
20-OCT-1997 to 26-OCT-1997
12-MAR-1998 to 16-MAR-1998
15-APR-1998 to 19-APR-1998
28-JUN-1998 to 02-JUL-1998
24-JUL-1998 to 29-JUL-1998
-
- Daily.
-
-
-
-
The principal variable is the gridded solar irradiances of 1.1
nm resolution SUSIM instrument function given every nm on the
half nm. There are also parameters related to the data and
seven solar indices. These are:
- UARS Mean Solar Distance (MSD).
- H I Lyman alpha (hydrogen @ 121.6 nm) Index
- O I (oxygen @ 130.4 nm) Index
- C II (carbon @ 133.5 nm) Index
- C IV (carbon @ 154.9 nm) Index
- Al Edge (aluminum @ 208 nm) Index
- Mg II (magnesium @ 279.9 nm) Index
- Ca II (calcium @ 393.3 nm) Index
- Average Collection Time of Gridded Irradiances
-
-
A general description of these indices follows. For more
detailed and complete descriptions please refer to the metafile definitions.
The emission line indices, H I Lyman alpha, O I, C II, and C
IV, are the flux in the peak minus the level of the flux of the
local continuum. The absorption line indices, Mg II and Ca II,
are ratios of the depth of the absorption feature to the
inferred local continuum. The Al Edge is (roughly) the ratio of
the irradiance at the upper level (at longer wavelengths above
the Al Edge) to the lower level (at shorter wavelengths). The
MSD is the distance from the satellite to the sun at 1200 GMT
on the day of the measurement. The Average Collection Time of
Gridded Irradiances is the straight average time for the
measurements since the start of the day.
-
-
The units of measurement for the parameters and solar indices
are as follows:
- Solar Irradiances are given in W/m3.
- UARS Mean Solar Distance (MSD) is given in km.
- The H I, O I, C II, and C IV emission indices are given
in mW/m2.
- The Al Edge, Mg II, and Ca II indices are dimensionless
ratios.
- The Average Collection Time is given in seconds.
-
- All values are stored as positive real numbers.
-
-
-
-
SUSIM Level 3BS granules are produced daily. Each granule is a
multi-file granule consisting of two files:
-
The binary data file (files ending with PROD, or *PROD
extension) which contains the gridded irradiance data, and
quality, as well as observation time, the mean solar distance,
and the 7 solar indices and their character string labels.
- An ASCII metadata file (files ending with META, or *META
extension) associated with the data file containing items such as
the PI assigned quality flag and record length size of the data
file.
The format for granule file names is
SUSIM_L3BS_Ddddd.Vvvvv
_Ccc_xxxx, where dddd is the UARS day (0001 = 12 September
1991), vvvv is the data version number, and cc is the data version
cycle number. The file extension xxxx is either PROD for the binary
data files, or META for the ASCII metadata files.
The average size for a SUSIM Level 3BS granule is about 12 kB.
The *META files are small, only about 700 bytes each.
-
- The data are in a native UARS format. The files were originally
created on a VAX/VMS system at the UARS CDHF, and now exist as UNIX
stream files at the Goddard DAAC. SUSIM data file structures are
presented in the Standard Formatted Data Units (SFDU) documents
listed in the References section.
-
-
-
-
-
- Solar signals are reduced by SUSIM software to produce solar
ultraviolet irradiances as a function of wavelength and time.
This is accomplished by applying encoder to wavelength
assignment, photon counter nonlinearity, darks, gain,
temperature, field of view, moves, wavelength, stray light,
optical degradation, and 1 AU adjustments. Irradiances from 1.1
nm (MM) scans are then placed on the required 1 nm grid. In
addition, several solar indices are derived from the mid
resolution and high resolution continuous monitoring scans.
-
-
-
- SUSIM production software comprises five separate job steps
or program units, namely, SUS1, SUS2, SUS3, SUS4, and SUS5. These
are run sequentially using a full day of data that begins at
00:00:00 GMT. The input data from the spacecraft consists of four
level 0 files: the SUSIM science file (SUSIMA or SUSIMB), the
ENGINEERING file, the SPACECRAFT file, and the onboard computer
(OBC) file. The production software also uses other data - mainly
ephemeris information that is not completely derived from UARS
telemetry. The production software produces levels 1, 2, and 3
data files. Generally, level 1 data consist of processed
instrument engineering reports and science data that remain in
engineering units; level 2 data consist of the entire science
data output that is not immediately intended for general
distribution; and level 3 outputs consist of data that will be
available to general science community through the UARS CDHF and
GSFC DAAC and also through the SUSIM's FTP site. Please refer to
SUSIM Level 2 Data Description and Structure, and
SUSIM Level 3 Data Description and Structure documents for a
more complete description of the SUSIM level 2 and level 3
processing procedures.
-
- An updated stray light algorithm has been inserted for data
version 19. Updated calibration files containing responsivity,
field-of-view, temperature, and gain corrections were also added
for version 19 processing. Responsivity interpolation between
calibrations is now based on UV exposure and a function which
represents the general degradation behavior.
-
-
-
- None.
-
- The data record of SUSIM level 3 product contains the 1 nm
resolution irradiances and associated qualities for gridded
wavelengths between and including 115.5 nm to 410.5 nm, starting
wavelength, and nine parameters. Seven of the calculated
parameters are various solar indices, one is the mean solar
distance at noon GMT, and last is the average time of measurement
of the gridded data.
-
-
Example SUSIM level 3BS spectrum and solar indices for a single
file:
See also SUSIM
Mg II index plots spanning the entire experimental period.
-
-
For each gridded irradiance datum, a formal error is computed
accounting for both dark and light signals. Estimation of
systematic errors for SUSIM is highly complex and thus is unsuited
for this type of computation. See the validation paper by Woods, et al. and the
DAAC quality file for a more detailed error analysis.
Occasionally, the scans which are used to produce the gridded data
did not complete leaving some values for the gridded irradiances
unmeasured. These will have a value of exactly zero as will their
corresponding error estimate. This latter value distinguishes such
a value from an actual zero irradiance. (A zero irradiance can
occur when the measured light signal is smaller than the sum of its
corresponding dark signal and the estimate of stray light.)
Any apparent anomalies which are found in the SUSIM data would
be of interest to the SUSIM team. Reporting of such
instances would be greatly appreciated will likely improve the
quality the future reprocessing of these data.
-
-
There are several sources of error in the SUSIM level 3BS gridded
irradiances. Most of these are systematic rather than random in
nature. They follow, listed in rough order of importance:
- Responsivity Degradation Estimation
- Stray/Scattered Light Model
- Initial (i.e. prelaunch) Responsivity Calibrations
- Wavelength Assignment to Hardware Encoder Position
- Field-of-View (solar pointing) Errors
- Detector Gains and Temperature Correction
- Light Signal Measurement Random Error
- Dark Signal Measurement and Estimate
-
-
-
-
The PI Data Quality value (PI_DQ) is determined for each day's
data as follows. A PI_DQ value of 4.0 is currently given to
level 3BS products. This indicates that optical calibration for
that data was determined using interpolation between reference
calibration days. A data quality value of 2.0 is currently
given to level 3AS products. This indicates that extrapolation
from the two previous calibration files was used to determine
the optical calibration coefficients. (At the time of this
writing, only 3BS data is archived at the DAAC.) A data quality
of 0.0 indicates that there are no usable data in this file.
UARS Data Quality (UARS_DQ) is set to 0.4 if better than 98%
of data are valid. It is set to 0.3 if between 76% to 98% of
data are valid and is set to 0.2 if between 50% to 76% of data
are valid. Finally, UARS Data Quality is set to 0.1 if less
than 50% of data are valid. PI_DQ and UARS_DQ flags are located
in the catalog entry on the CDHF and in the metafile on the
GSFC DAAC.
-
- Precision information is placed in the form of a measurement
standard deviation into the "data quality" field corresponding to
each 1nm gridded irradiance. No precision estimates for the solar
indices are given.
-
- None.
-
- Data files are checked to ensure that they are properly
transferred and translated from their original VAX/VMS format at
the UARS CDHF to the DAAC's UNIX format. No additional data
checks are performed by the DAAC.
-
-
-
- The data files exist as UNIX stream files at the Goddard DAAC.
The binary data files are in IEEE big-endian format. The binary data
files should be read on 32 bit machines running UNIX operating
systems. This is especially important for fields which are IEEE
floating point values, such as the profile data and quality values.
For users of non 32-bit and/or non-UNIX machines, conversion routines
to read the data files will need to be written. File record length
information is only listed in the ASCII metadata files (*META
extension) which accompany the data files.
-
-
The following are known problems with gridded irradiances.
- Irradiances in the continuum below 140nm and especially below
120nm are often not well determined because the signal levels are
very low relative to the other random and systematic
effects.
- Irradiances corresponding to emission line peaks are spread
over two or three gridded wavelengths because of the width of the
SUSIM instrument function.
-
The irradiance data between the first day of operations (UARS
day 30 and UARS day 77) have larger systematic errors because
during that period:
- The field-of-view dependence of the instrument
responsivity was not measured directly and was changing
rapidly.
- SSPP solar pointing errors were larger during this period
than those during the rest of the experiment.
- The responsivity degradation rates were changing rapidly
and were not measured often enough.
- Irradiances above 400 nm are based on signal measurements
which are known to have additional anomalous stray light which is
probably undercorrected.
-
- The variability of irradiance in the various strong emission
lines (e.g. H I Ly-a) is better obtained from the solar indices
rather than the gridded irradiances. The SUSIM UARS Home
page should be consulted for periodic updates about existing
SUSIM data and new data products. For example, there is a new
algorithm used to form the Mg II index from the V19 irradiances. This
improved
index is now available directly from SUSIM group at NRL.
-
- None.
-
- These data are suitable for the study of solar variability as well as
providing realistic UV energy input values for atmospheric models.
-
- The SUSIM instrument is still (5/8/97) acquiring data. It is hoped
that this will continue until the maximum levels of the next solar cycle
are reached, perhaps sometime in the year 2000. Improvements in the
processing methods are still anticipated in the areas of index
redefinition and refinement, degradation, field-of-view, and
reconvolution among others. Over time, these improvements will be
incorporated into the latest versions of the SUSIM data. Apart algorthmic
improvements, new data must be calibrated using data from calibration
scans during the same time period. At present, major calibrations are
done every six months. Afterwards, new SUSIM irradiances can then be made
available. Meanwhile, SUSIM data will be available through the SUSIM UARS Data
Page and at times will be more up-to-date than that found on the
DAAC.
-
-
-
-
Simple read/dump programs are available for reading the SUSIM level
3A and 3B data files. The read programs are available in both
Fortran and C languages. These programs simply print the file
contents to the screen.
The *META and *PROD files (see section 8 Data
Granularity) must be kept in the same directory, because the
programs require the *META file as the input parameter in order to
read the *PROD file. The *META file is necessary because it
contains file record length information, which is not in the *PROD
files.
If you are using the Fortran READ programs you may need to
change the OPEN statement. Some machines read 4 byte words, while
other machines read 1 byte. If the program isn't working correctly,
you should try chang RECL=RECSIZ/4 to RECL=RECSIZ.
Contact science@eosdata.gsfc.nasa.gov
for problems with the read/dump software.
-
-
To compile the programs, just type:
f77 FILE_NAME.F -o FILE_NAME (Fortran programs)
or cc file_name.c -o file_name (C programs)
Below are examples showing how to run the programs:
$ READUMP_L3BS_DATA (Fortran program)
PLEASE ENTER META DATA FILE NAME BELOW:
SUSIM_L3BS_D0001.V0003_C01_META
or $ readump_l3at_data SUSIM_L3BS_D0001.V0003_C01_META (C program)
-
-
-
- Name:
- Help Desk
- Address:
- NASA Goddard Space Flight Center
- Distributed Active Archive Center
- Code 610.2
- Greenbelt, MD 20771
- Telephone Numbers:
- Phone: 1-301-614-5224
- FAX: 1-301-614-5268
- Electronic Mail
Address:
- daacuso@daac.gsfc.nasa.gov
-
-
The UARS SUSIM data are archived at the GSFC DAAC, and can be
identified by the attributes listed below.
Data Set = UARS
Data Product = SUSIM L3BS DAILY SOLAR DATA
-
-
The SUSIM level 3BS data files can be obtained from the Goddard
DAAC by several mechanisms. These include the following:
-
Anonymous
FTP. The entire SUSIM Level 3BS data set can be
downloaded from the DAAC anonymous FTP server located at
daac.gsfc.nasa.gov, in directory
http://disc.sci.gsfc.nasa.gov/data/uars/susim. This area can also
be accessed through the World Wide Web at
ftp://daac.gsfc.nasa.gov/data/uars/susim. For convenience, the
data files are arranged in directories by instrument, level,
year, and month (e.g. data/uars/susim/3bs/1993/10).
-
The DAAC Web-Based Archive
Interface provides a means for searching and
ordering data. To search the data holdings and place an order,
go to the DAAC Home Page located at "/index.shtml", and click
on the "Search and Order" icon. Next, pick the "Data Set" link,
and from there choose "UARS".
-
Earth
Observing System Data Gateway (EDG). You can place
orders for the UARS data through the Earth Observing System
(EOS) Data Gateway. From here you can also order data products
from other data centers. The web address for the EDG is
"http://eos.gsfc.nasa.gov/imswelcome/".
- DAAC Help
Desk. Data can also be obtained by contacting the
GSFC DAAC Help Desk listed above.
Data can be ordered electronically (FTP).
-
- The DAAC currently supports only level 3BS data products from
SUSIM.
-
-
The SUSIM level 3BS data are available. See the section above on Procedures for Obtaining Data for specific
information.
Additional output products are available via ftp at the SUSIM RAC.
For more information, please refer to the corresponding SUSIM Data
Page.
-
- Satellite/Instrument/Data Processing
Documentation:
-
- Floyd, L. E., D. K. Prinz, and G. E. Brueckner, "SUSIM/UARS
Optical Responsivity Evolution: Character and Implications",
Proceedings of the International Workshop on VUV and X-Ray
Radiometry for Space-Based Instruments, Berlin, pp. 51-54,
1994.
- Floyd, Linton E., Lynn C. Herring, Dianne K. Prinz, and
Guenter E. Brueckner, "Maintaining calibration during the long
term space flight of the Solar Ultraviolet Spectral Irradiance
Monitor (SUSIM)", Proceedings, SPIE,
2831, pp. 36-46, 1996.
- Prinz, D.K., L.E. Floyd, L.C. Herring, and G.E. Brueckner,
"On-orbit performance of deuterium calibration lamps during the
four years of SUSIM operations on UARS", Proceedings,
SPIE, 2831, pp. 25-35, 1996.
- Reiser, P., J. Lumpe, C. Wang, and D. K. Prinz, "Post Launch
Characterization of Stray Light in the UARS/SUSIM",
Proceedings of the International Workshop on VUV and X-Ray
Radiometry for Space-Based Instruments, Berlin, pp. 47-50,
1994.
- Journal Articles and Study
Reports:
-
- Brueckner, G. E., K. L. Edlow, L. E. Floyd IV, J. L. Lean,
and M. E. VanHoosier, "The
Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) on Board
the Upper Atmosphere Research Satellite (UARS)", J.
Geophys. Res. 98, D6, pp. 10695-10711,
1993.
- Brueckner, G.E., L.E. Floyd, P.A. Lund, D.K. Prinz, and M.E.
VanHoosier, "Solar ultraviolet spectral-irradiance observations
from the SUSIM-UARS experiment", Metrologia,
32, pp. 661-665, 1995/96.
- Floyd, L.E., P.A. Reiser, P.C. Crane, L.C. Herring, D.K.
Prinz, and G.E. Brueckner, "Solar Cycle 22 UV Spectral Irradiance
Variability: Current Measurements by SUSIM UARS", accepted for
publication, Solar Physics, 1997.
- Lean, Judith, Michael VanHoosier, Guenter Brueckner, Dianne
Prinz, Linton Floyd, and Kenneth Edlow, "SUSIM/UARS Observations
of the 120 to 300 nm Flux Variations During the Maximum of the
Solar Cycle: Inferences for the 11-year Cycle", Geophysical
Research Letters, 19, 22, pp. 2203-2206,
1992.
- Reber, C. A., C. E. Trevathan, R. J. McNeal, and M. R.
Luther, "The Upper Atmosphere Research Satellite (UARS) Mission",
J. Geophys. Res. 98, D6, pp.
10643-10647, 1993.
- Woods, T. N., et al., "Validation of the UARS Solar
Ultraviolet Irradiances: Comparison with the ATLAS-1, -2
Measurements", J. Geophys. Res., 101,
D6, pp. 9541-9569, 1996.
- Goddard DAAC online
documentation:
-
- Linton Floyd,
SUSIM DAAC Quality, May, 1997.
- L. E. Floyd and A. E. Esfandiari,
SUSIM Whole Data Set Description, NURSSU07, December,
1996.
- L. E. Floyd and A. E. Esfandiari,
SUSIM Level 2 Data Description and Structure, NURSSU05,
December, 1996.
- L. E. Floyd and A. E. Esfandiari,
SUSIM Level 3 Data Description and Structure, NURSSU08, May,
1997.
- C. Horne,
UARS granule level metadata file description, 1994.
-
- DATA PRODUCT
- A collection of parameters packaged with associated ancillary and
labeling data. Uniformly processed and formatted. Typically uniform
temporal and spatial resolution.
- DATA SET
- A logically meaningful grouping or collection of similar or
related data. Data having mostly similar characteristics (source or
class of source, processing level and algorithms, etc.).
- GRANULE
- A granule is the smallest aggregation of data which is
independently managed.
-
-
| CDHF |
Central Data Handling Facility |
| cm |
centimeter |
| DAAC |
Distributed Active Archive Center |
| DCF |
Data Capture Facility |
| EOS |
Earth Observing System |
| FOV |
Field of View |
| FWHM |
Full Width, Half Maximum |
| GSFC |
Goddard Space Flight Center |
| IMS |
Information Management System |
| km |
kilometer |
| m |
meter |
| MSD |
mean solar distance |
| mW |
milliwatts |
| NASA |
National Aeronautics and Space Administration |
| nm |
nanometer |
| PI |
Principal Investigator |
| RAC |
Remote Analysis Computer |
| SFDU |
Standard Formatted Data Units |
| SOLSTICE |
Solar-Stellar Irradiance Comparison Experiment |
| SSPP |
Solar Stellar Pointing Platform |
| SUSIM |
Solar Ultraviolet Spectral Irradiance Monitor |
| TDRSS |
Tracking and Data Relay Satellite System |
| UARS |
Upper Atmosphere Research Satellite |
| W |
Watts |
-
-
-
- 01 May 1997
-
- 04 Jul 1995
-
-
-
- -- web-contact-disc@listserv.gsfc.nasa.gov
-
- /guides/GSFC/guide/uars_susim_l3bs_dataset.gd.shtml
NAVIGATION BUTTONS
 UARS
Project Authors: Linton
Floyd -- floyd@susim.nrl.navy.mil
Ed Esfandiari --
esfandiari@susim.nrl.navy.mil
James Johnson -- jjohnson@daac.gsfc.nasa.gov
Change History
- Version 2.0
- Version baselined on addition to the GES Controlled Documents List,
July 4, 1995.
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Atmos Composition
