COSMIC
STATUS
Operational
AVAILABILITY
Data available to all interested parties upon submission of online request.
REQUEST PROCEDURE
See website: http://www.cosmic.ucar.edu/index.html
Satellite Instruments
Constellation of 6 LEO satellites in 6 uniformly spaced planes at 72 deg inclination. Each carries a GPS atmospheric limb sounder, a tri-band beacon, and an ionospheric photometer
CONTACT
Chris Rocken
UCAR
rocken@ucar.edu
SPECIFICATIONS
Measurment TypeMicrowave-occultation
Platform TypeCOSMIC
OrbitOther (provide altitude, inclination, cycle)
Spectral CoverageN/A
Active/PassivePassive
Scan PatternMulti-angle
Variablesprofiles of atmospheric refractivity, density, pressure, temperature, and geopotential heights from surface to 40 km; tropopheric water vapor from surface to 5 km; iono electron densities and TEC
Altitude800
Inclination72
Repeat TimeN/A
Wavelength19 to 24cm
Number of Bands2 (GPS L1 & L2 bands)
Start DateJun 2006
Temporal CoverageCOSMIC program provides RO profiles since 1995 - from previous missions
Swath Width200 km x 1 km (limb sounding geometry)
Resolution 10-20 km 100 (vertical)m
Resolution 220 - 12o km (vertica 1000m
Resolution 3100 - 800 km vertical 2000m
REFERENCES
See web site
REMARKS
Radio Occultation (RO) observations from COSMIC observe GPS signals with a satellite-based receiver and inferring the deviations in each signal's straight-line path caused by ionospheric electron desnisty and neutral atmospheric, pressure, temperature and moisture gradients. COSMIC is currently providing between 1000-2500 daily RO profiles in the neutral atmosphere, 1000-2500 daily electron density profiles and total electron content arcs, and TIP radiance products. The data have already demonstrated their value for operational weather forecasting, hurricane forecasting, and investigations of the atmospheric boundary layer. The data have been used extensively to test ionospheric models and their use in operational space weather models is under development. COSMIC GPS RO data also have the potential to be of great benefit to climate studies due to their demonstrated high precision and global and diurnal sampling coverage. The neutral atmospheric profiles, due to their all-weather and high vertical resolution characteristics, are especially suitable for studies of the tropopause and atmospheric boundary layer. The observations are also very useful for climate studies due to their exceptional long-term stability.
UPDATED ON
1 Oct 2009 14:17