2.2.2 spase://VITMO/NumericalData/TIMED/GUVI/Neutral_Density_Product TIMED GUVI L2B Neutral Density Profiles 2011-10-21T12:00:00.000 O2, N2, and O neutral density profiles over an orbit as a function of latitude and altitude derived from GUVI OI 135.6 nm and N2 LBH short and long radiance profiles. NASA, Andrew B. Christensen spase://SMWG/Person/Andrew.B.Christensen PrincipalInvestigator Neutral Density Profiles description http://guvi.jhuapl.edu/site/data/documents/guvi_dit_readme_02-04-10.pdf spase://SMWG/Repository/TIMED/GUVI_POC Online Open GUVI POC L2B Neutral Density Product (IDLsave) Data Request http://guvi.jhuapl.edu/site/data/data_fetch/l2b_ndp_idlsave.shtml This web page allows the request of data files for this product. To request data: select the year and day then press display. IDL None NASA, Andrew B. Christensen Calibrated GUVI L2B Neutral Density Profiles Level 2B spase://SMWG/Instrument/TIMED/GUVI Profile 2002-03-01T00:00:00.000Z 2007-12-11T00:00:00.000Z Earth.NearSurface.Thermosphere Earth.NearSurface.AuroralRegion TIMED GUVI lower thermosphere MLTI Atomic Oxygen Number Density NDPSORBIT.OX Retrieved values of atomic oxygen number density from the inversion process Note that the retrieved densities and temperatures are given for the full zm (110 - 667 km) altitude range. But the highest accuracy is due to sensitivity of the dayglow between about 150 and 300 km to the parameters. So densities outside of that altitude range should be viewed as extrapolations of the best-fit model within that interval. However, our initial comparisons with total mass densities above 400 km from satellite drag and accelerometers show good agreement with the GUVI retrievals?a very promising result. If any of the elements in the FLAG parameter are set, retrievals should be used with caution, or preferably not used at all cm-3 Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (n is approximately 100). Atom NumberDensity Molecular Oxygen Number Density NDPSORBIT.O2 Retrieved values of molecular oxygen number density from the inversion process Note that the retrieved densities and temperatures are given for the full zm (110 - 667 km) altitude range. But the highest accuracy is due to sensitivity of the dayglow between about 150 and 300 km to the parameters. So densities outside of that altitude range should be viewed as extrapolations of the best-fit model within that interval. However, our initial comparisons with total mass densities above 400 km from satellite drag and accelerometers show good agreement with the GUVI retrievals?a very promising result. If any of the elements in the FLAG parameter are set, retrievals should be used with caution, or preferably not used at all cm-3 Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Molecule NumberDensity Molecular Nitrogen Number Density NDPSORBIT.N2 Retrieved values of molecular nitrogen number density from the inversion process Note that the retrieved densities and temperatures are given for the full zm (110 - 667 km) altitude range. But the highest accuracy is due to sensitivity of the dayglow between about 150 and 300 km to the parameters. So densities outside of that altitude range should be viewed as extrapolations of the best-fit model within that interval. However, our initial comparisons with total mass densities above 400 km from satellite drag and accelerometers show good agreement with the GUVI retrievals?a very promising result. If any of the elements in the FLAG parameter are set, retrievals should be used with caution, or preferably not used at all cm-3 Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Molecule NumberDensity Temperature NDPSORBIT.T Retrieved values of temperature from the inversion process Note that the retrieved densities and temperatures are given for the full zm (110 - 667 km) altitude range. But the highest accuracy is due to sensitivity of the dayglow between about 150 and 300 km to the parameters. So densities outside of that altitude range should be viewed as extrapolations of the best-fit model within that interval. However, our initial comparisons with total mass densities above 400 km from satellite drag and accelerometers show good agreement with the GUVI retrievals?a very promising result. If any of the elements in the FLAG parameter are set, retrievals should be used with caution, or preferably not used at all kelvin Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Atom Molecule Temperature Uncertainty in Atomic Oxygen Number Density NDPSORBIT.SIG0X 1-sigma uncertainty in atomic oxygen number density cm-3 Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Molecule NumberDensity Uncertainty in Molecular Oxygen Number Density NDPSORBIT.SIG02 1-sigma uncertainty in molecular oxygen number density cm-3 Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Molecule NumberDensity Uncertainty in Molecular Nitrogen Number Density NDPSORBIT.SIGN2 1-sigma uncertainty in molecular nitrogen number density cm-3 Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Molecule NumberDensity Uncertainty in Temperature NDPSORBIT.SIGT 1-sigma uncertainty in temperature kelvin Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Atom Molecule Temperature Qeuv NDPSORBIT.QEUV The solar energy flux from the TIMED/SEE data. Multiply Qeuv by MORBIT(0).M(4) x MORBIT(0).M(7) to obtain the solar flux required to fit the GUVI dayglow. mW/m2 Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Electromagnetic EnergyFlux Altitude NDPSORBIT.ZM Altitude grid in model km Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Positional O/N2 column ratio NDPSORBIT.O_N2 O/N2 column ratio computed from retrieved O and N2 densities km Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Ratio Other NRLMSIS Atomic Oxygen Number Density NDPSORBIT.OX0 Values of atomic oxygen number density from the output of the NRLMIS model predictions Note that the retrieved densities and temperatures are given for the full zm (110 - 667 km) altitude range. But the highest accuracy is due to sensitivity of the dayglow between about 150 and 300 km to the parameters. So densities outside of that altitude range should be viewed as extrapolations of the best-fit model within that interval. However, our initial comparisons with total mass densities above 400 km from satellite drag and accelerometers show good agreement with the GUVI retrievals?a very promising result. If any of the elements in the FLAG parameter are set, retrievals should be used with caution, or preferably not used at all cm-3 Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Atom NumberDensity NRLMSIS Molecular Oxygen Number Density NDPSORBIT.O20 Values of molecular oxygen number density from the output of the NRLMIS model predictions Note that the retrieved densities and temperatures are given for the full zm (110 - 667 km) altitude range. But the highest accuracy is due to sensitivity of the dayglow between about 150 and 300 km to the parameters. So densities outside of that altitude range should be viewed as extrapolations of the best-fit model within that interval. However, our initial comparisons with total mass densities above 400 km from satellite drag and accelerometers show good agreement with the GUVI retrievals?a very promising result. If any of the elements in the FLAG parameter are set, retrievals should be used with caution, or preferably not used at all cm-3 Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Molecule NumberDensity NRLMSIS Molecular Nitrogen Number Density NDPSORBIT.N20 Values of molecular nitrogen number density from the output of the NRLMIS model predictions Note that the retrieved densities and temperatures are given for the full zm (110 - 667 km) altitude range. But the highest accuracy is due to sensitivity of the dayglow between about 150 and 300 km to the parameters. So densities outside of that altitude range should be viewed as extrapolations of the best-fit model within that interval. However, our initial comparisons with total mass densities above 400 km from satellite drag and accelerometers show good agreement with the GUVI retrievals?a very promising result. If any of the elements in the FLAG parameter are set, retrievals should be used with caution, or preferably not used at all cm-3 Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Molecule NumberDensity NRLMSIS Temperature NDPSORBIT.T0 Values of temperature from the ioutput of the NRLMIS model predictions Note that the retrieved densities and temperatures are given for the full zm (110 - 667 km) altitude range. But the highest accuracy is due to sensitivity of the dayglow between about 150 and 300 km to the parameters. So densities outside of that altitude range should be viewed as extrapolations of the best-fit model within that interval. However, our initial comparisons with total mass densities above 400 km from satellite drag and accelerometers show good agreement with the GUVI retrievals?a very promising result. If any of the elements in the FLAG parameter are set, retrievals should be used with caution, or preferably not used at all kelvin Dimensions: [n,i] - where n is the number of levels in a limb scan (n is nominally 21); i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Atom Molecule Temperature NRLMSIS O/N2 column ratio NDPSORBIT.O_N20 O/N2 column ratio computed from NRLMSIS O and N2 densities km Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Ratio Other Iteration steps NDPSORBIT.N_STEPS The number of retrieval iteration steps for a given limb scan unitless Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Other Data Quality Flag NDPSORBIT.FLAG Data quality flag of the retrieved values of densities and temperatures from the inversion process. Most data with flags set to 1 have been removed. unitless 3 Dimensions: (3, n, i), where 3 is a 3-element vector; n is a n-level profile (nominally n is 21); and i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). flag_0 0 A value of zero means the retrieval was nominal; a value of one means the number of iteration steps for a given limb scan reached 20 without convergence in the retrieval process. flag_1 1 A value of zero means the retrieval was nominal; a value of one means any of the model parameters hit the a priori upper and lower limits. flag_2 2 A value of zero means the retrieval was nominal; a value of one means the altitude of peak intensity was too close to a boundary. Other Day of year NDPSORBIT.IYD The day of year of the limb scan days Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). 1 366 Temporal Seconds of day NDPSORBIT.SEC The UT seconds of day of the limb scan UT seconds Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). 0 86400 Temporal Geolocated latitude NDPSORBIT.GLAT The geolocated latitude of the limb scan assigned to the tangent point near the peak of the airglow layer, roughly 160 km degrees Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). -90 90 Positional Geolocated longitude NDPSORBIT.GLONG The geolocated longitude of the limb scan assigned to the tangent point near the peak of the airglow layer, roughly 160 km degrees Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). -180 180 Positional Solar time NDPSORBIT.STLP The solar time of the limb scan hours Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). 0 24 Positional Averaged f10.7 NDPSORBIT.F107a The 81-day average of the observed solar 10.7-cm radio flux as recorded by DRAO at Pentiction, British Columbia, Canada, at 2000 UT. 10-22W m-2 Hz-1 Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Electromagnetic EnergyFlux Previous-day f10.7 NDPSORBIT.F107 The previous-day observed solar 10.7-cm radio flux as recorded by DRAO at Pentiction, British Columbia, Canada, at 2000 UT. 10-22W m-2 Hz-1 Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Electromagnetic EnergyFlux f10.7 NDPSORBIT.F107_0 The current-day observed solar 10.7-cm radio flux as recorded by DRAO at Pentiction, British Columbia, Canada, at 2000 UT. 10-22W m-2 Hz-1 Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Electromagnetic EnergyFlux Ap NDPSORBIT.AP The current-day daily geomagnetic Ap index. unitless Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). 0 400 Other Solar zenith angle NDPSORBIT.SZA The solar zenith angle at the geolocated tangent point. degrees Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). -180 180 Direction Positional Model parameters structure MORBIT A structure containing the model parameters and other information and constraints. Components are M, an array of model parameters, which are retrieved from the inversion process; MINIT, an array of initial guesses of the parameter vector, M ; NAME, an array containing the string name of the model parameter; CHANGE, an array indicating the parameters that are allowed to vary during the inversion process, LOWERLIMIT, an array indicating the lower limits of the parameter, UPPERLIMIT, an array indicating the upper limits of the parameter, COVFIT, a covariance matrix for the retrieved model parameters. various Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Other Data structure DORBIT A structure containing the data, retrieved fits, and other information. Components are DIN, an array of the original data; NAME, an array containing the name of the measured intensity (eg, 1356 or LBH); D, an array containing the best fit model intensities; D0, an array containing the intensities computed using the initial guess parameters; ALT, an array containing the tangent altitudes for the intensities; COVDATA, an array containing the covariance of the data. various Dimensions: [i] - where i is the number of limb scans (i.e., records) in an orbital file (i is approximately 100). Other