Data Access
The Level-2 Electron Density Profiles data product contains F-region electron density as a function of altitude and latitude derived from the GUVI limb data. Summaries of estimated peak electron density and total electron content are also given as Level 3 products.
The profiles are derived from the 135.6-nm channel of the GUVI limb data. The 135.6-nm emission at night is due almost exclusively to recombination of O+ ions. Since O+ is the primary ion in the F region, the 135.6-nm volume emission rate is closely related to the square of the electron density.
Details of the procedure of producing the electron densities are given in: DeMajistre, R., L.J. Paxton, D. Morrison, J-H. Yee, L.P. Goncherenko and A.B. Christensen, Retrievals of nighttime electron density from Thermosphere Ionosphere Mesosphere and Dynamics (TIMED) mission Global Ultraviolet Imager (GUVI) Measurements, J. Geophys Res., 109, A05305, doi:10.1029/2003JA010296.
Version:2.2.2
The Level-2 Electron Density Profiles data product contains F-region electron density as a function of altitude and latitude derived from the GUVI limb data. Summaries of estimated peak electron density and total electron content are also given as Level 3 products.
The profiles are derived from the 135.6-nm channel of the GUVI limb data. The 135.6-nm emission at night is due almost exclusively to recombination of O+ ions. Since O+ is the primary ion in the F region, the 135.6-nm volume emission rate is closely related to the square of the electron density.
Details of the procedure of producing the electron densities are given in: DeMajistre, R., L.J. Paxton, D. Morrison, J-H. Yee, L.P. Goncherenko and A.B. Christensen, Retrievals of nighttime electron density from Thermosphere Ionosphere Mesosphere and Dynamics (TIMED) mission Global Ultraviolet Imager (GUVI) Measurements, J. Geophys Res., 109, A05305, doi:10.1029/2003JA010296.
| Role | Person | |
|---|---|---|
| 1. | PrincipalInvestigator | spase://SMWG/Person/Andrew.B.Christensen |
This web page allows the request of data files for this product. To request data: select the year and day then press display.
SPDF repository of TIMED Level-2 Electron Density Profiles in CDF format at CDAWeb
SPDF repository of TIMED Level-2 Electron Density Profiles in CDF format at CDAWeb
TIMED GUVI L2 data with subset, plot, list from CDAWeb
Geographic Latitude (registered at ~300km)
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Geographic Longitude (registered at ~300km)
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Geomagnetic (simple dipole) Latitude (registered at ~300km)
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Geomagnetic (simple dipole) Longitude (registered at ~300km)
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Universal Time of observation in number of milliseconds since start of current day. Timestamp marks beginning of interval
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Electron Density Profiles Data
Dimensions: [23,n] - where 23 is the number of levels in a profile; n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Retrieved Uncertainty in Electron Density
Dimensions: [23,n] - where 23 is the number of levels in a profile; n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Volume Emission Rate
Dimensions: [23,n] - where 23 is the number of levels in a profile; n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Uncertainty in Volume Emission Rate
Dimensions: [23,n] - where 23 is the number of levels in a profile; n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Atomic Oxygen Density Profile (from MSIS)
Dimensions: [23,n] - where 23 is the number of levels in a profile; n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Volume Emission Rate (no mutual neutralization correction)
Dimensions: [23,n] - where 23 is the number of levels in a profile; n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Uncertainty in Volume Emission Rate (no mutual neutralization correction
Dimensions: [23,n] - where 23 is the number of levels in a profile; n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Chapman Layer Maximum Density
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Chapman Layer Maximum Radius
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Chapman Layer Topside Scaleheight
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Uncertainty in Chapman Layer Maximum Density
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Uncertainty in Chapman Layer Maximum Radius
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Uncertainty in Chapman Layer Topside Scaleheight
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Geomagnetic (AACGM) Latitude (registered at ~300km)
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Geomagnetic (AACGM) Longitude (registered at ~300km)
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Earth radius at the given geographic latitude
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Index map into level 1B file
Dimensions: [n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
EDP/VER radius grid where altitude grid is (k_nonpar_r - re)
Dimensions: [23] - where 23 is the number of levels in a profile.
Observational Angles for Observation where tangent altitudes are (625.+Re)*sin(k_nonpar_thetapix) - re
Dimensions: [32].
If 1, chapman layers parameters present, 0 if not
Dimensions: [1] - a single value per orbital file.
Radiances at 135.6 nm
Dimensions: [32,14,n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Uncertainties of Radiances at 135.6 nm
Dimensions: [32,14,n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
H+ correction from IRI made, -1 if not
Dimensions: [1] - a single value per orbital file.
Number of limb scans for smoothing
Dimensions: [1] - a single value per orbital file.
Dimensions: [448,n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Dimensions: [448,n] - where n is the number of profiles (i.e., records) in an orbital file (n is approximately 136).
Dimensions: [32,2].
Dimensions: [32,2].
Dimensions: [50].
Dimensions: [32].
Dimensions: [448,50].
Dimensions: [448,50].