In the GOES routine schedule scan mode, two views at approximately 15 minute intervals of the CONUS (GOES-8) or PACUS (GOES-9) are provided in a half hour period. A northern hemisphere scan is also included in the 30 minute cycle. During GOES Rapid Scan Operations (RSO), 4 views of the CONUS (GOES-8) or Sub-CONUS (GOES-9) are provided at approximately 7.5 minute intervals in a half hour period. A northern hemisphere scan for both GOES is also included in the 30 minute cycle. During GOES Super Rapid Scan Operations (SRSO), approximately 10 one minute interval scans are provided every half hour using prescribed 1000x1000km sectors. The remaining time in the half hour cycle is devoted to scans of the northern hemisphere and CONUS (GOES-8) or Sub-CONUS (GOES-9). When GOES RSO or SRSO is utilized, most of the southern hemisphere is not scanned.The corresponding GOES-8 schedules are:
Samuel Patterson DOC/NOAA/NESDIS FB4 Rm. 0312 E/SP11 Suitland Federal Center Suitland, Maryland 20233 Voice: 301-457-5205 Fax: 301-457-5199 spatterson@nesdis.noaa.gov
Mission Life |
5 years, minimum |
Dimensions | |
|
2 meter (7 foot) cube |
|
27 meters (88 feet) |
Weight | 2100 kg (4600 lb) |
Orbit | Geosynchronous |
|
36,000 km (22,000 mi) |
|
75W and 135W |
|
Equatorial, within 0.5 degree |
Power | 1050 watts @ 42 volts, solar array; battery backup |
Launch vehicle | Atlas-I/Centaur (GOES-I/K) Atlas-II/Centaur (GOES-L/M) |
Communications | Imager and Sounder in GVAR format at 2.1 Mbits/sec |
A preliminary assessment of the performance of the infrared channels of the GOES-9 Imager was made on June 16, after the detector-patch temperature had stabilized at 101K. GOES-9 performance, in general, beats specification and GOES-8 performance. The responsivities of all seven IR detectors were within 2% of their prelaunch values. It is noteworthy that the significant responsivity losses that affected channels 2 and 3 of the GOES-8 Imager were not reproduced on GOES-9. (The higher responsivity in GOES-9's channel 2 still allows the sensor to observe a maximum scene temperature of approximately 325K.) Noise in the GOES-9 Imager's IR channels, tabulated below, is far lower than the specified maxima and even below the GOES-8 values. NOISE (in degrees K @ 300K, unless otherwise noted) Channel GOES-9 GOES-8 Specification (max) 2A 0.11 0.20 1.4 2B 0.11 0.22 1.4 3 0.14 0.18 1.0 (all values at @ 230K) 4A 0.09 0.12 0.35 4B 0.08 0.10 0.35 5A 0.18 0.22 0.35 5B 0.19 0.22 0.35
You can order raw broadcast data from the NOAA-NESDIS Satellite Active Archive (SAA), in the GOES format known as GVAR.
NASA copies of GVAR Documentation
Date: Thu, 15 Oct 1998 From: Craig Mayhew Subject: gvar processing If your compiler does not have the header file stream.h then it is probably not designed to compile C++ as we know it. To get a compatible compiler for the SUN you may need to get the GNU C++ compiler. It is free to download from: ftp://gatekeeper.dec.com/pub/GNU/ You will need the files: gcc-2.8.1.tar.gz libstdc++-2.8.1.tar.gz These archives should contain instructions for building the compiler. If you do not have any compiler then you can get a binary file for the SUN from: ftp://sunsite.unc.edu/pub/solaris/sparc/ You can get binaries for Solaris 2.4, 2.5, 2.5.1, or 2.6. You can even get the latest version (2.8.1) which should contain all of the files you need to build gvar. The gvar program has had some changes made to work with the GOES-10 satellite which operates in an inverted mode. I have placed the most up to date source in: ftp://goes.gsfc.nasa.gov/pub/goes/ The file gvar.tar.gz contains all required source code. It is exactly a tar of the gvar directory that you will see there. -- Craig Mayhew Science Systems and Applications, Inc. Goddard Space Flight Center mayhew@agnes.gsfc.nasa.gov
Dave McGinnis, NESDIS Frequency Manager Office of Systems Development National Environmental Satellite, Data. and Information Service/NOAA U.S. Department of Commerce Room 3301, Federal Building #4 Washington, D.C. 20233 Voice: 301-457-5125 Fax: 301-420-0932 E-mail: dmcginnis@nesdis.noaa.gov