Version:2.6.0
NumericalData
ResourceID
spase://NASA/NumericalData/TIMED/GUVI/Imaging/L1C_Disk
ResourceHeader
ResourceName
TIMED GUVI Imaging Level 1C Disk
DOI
https://doi.org/10.48322/91h6-7w03
ReleaseDate
2023-07-30 12:34:56.789
RevisionHistory
RevisionEvent
ReleaseDate
2021-06-02 00:00:00
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2023-07-30 12:34:56.789
Note
Added DOI and PublicationInfo minted by LFB, metadata versioned up to SPASE 2.6.0, reviewed by LFB 20230727
Description
This Level 1C data product measured over multiple scans on the disk contains data directly measure by the sensors such as photometer counts, uncertainties, light intensities and pointing information derived from the GUVI raw sensor data and the TIMED Satellite ephemeris data. The data are geolocated at a 150 km altitude, then gridded and binned to a 25 km X 25 km resolution GUVI-based coordinate system consisting of the along orbit position of the sensor and the angle of the scan from the nadir position. This gridding eliminates overlap from scan to scan due to the large instantaneous field-of-view of GUVI (about 12 degrees) and involves coaddition to place the values on a uniform instrument shared grid. The data is then determined whether its from day, night, aurora or twilight pixels.
Acknowledgement
NASA, Andrew B. Christensen
PublicationInfo
Authors
Christensen, Andrew, B.
PublicationDate
2023-01-01 00:00:00
PublishedBy
NASA Space Physics Data Facility
Contacts
InformationURL
Name
Imaging L1C Data Information
URL
PriorIDs
spase://VITMO/NumericalData/TIMED/GUVI/Imaging/L1C_Disk
spase://VSPO/NumericalData/TIMED/GUVI/Imaging/L1C_Disk
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
GUVI POC Imaging L1C Data Request
URL
Description
This web page allows the request of data files for this product. To request data: select the year and day then press display.
Format
NetCDF
Encoding
GZIP
Acknowledgement
NASA, Andrew B. Christensen
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description
SPDF repository of TIMED GUVI Level1C Disk in CDF format at CDAWeb
AccessURL
Name
HTTPS from SPDF
URL
Description
SPDF repository of TIMED GUVI Level1C Disk in CDF format at CDAWeb
Format
CDF
Acknowledgement
Please acknowledge the support from CDAWeb team at GSFC/SPDF.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb
URL
ProductKey
TIMED_L1CDISK_GUVI
Description
TIMED GUVI Imaging L1C data with subset, plot, list from CDAWeb
Format
Text
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/timed/guvi/levels_v10/level1c/disk_cdf/$Y/$m
AccessFilenameTemplate
timed_L1Cdisk_guvi_$Y$m$d$H$M$S_$v.cdf
Acknowledgement
Please acknowledge the support from the CDAWeb team at GSFC/SPDF.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb Programmatic Data Access
URL
Style
WebService
ProductKey
TIMED_L1CDISK_GUVI
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
Please acknowledge the support from the CDAWeb team at GSFC/SPDF.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
TIMED_L1CDISK_GUVI@0
ProductKey
TIMED_L1CDISK_GUVI@1
Description
Web Service to this product using the HAPI interface.
Format
CSV
Acknowledgement
Please acknowledge the support from the CDAWeb team at GSFC/SPDF.
ProcessingLevel
Calibrated
ProviderResourceName
GUVI Imaging L1C Disk data
ProviderProcessingLevel
Level-1C
ProviderVersion
004
InstrumentIDs
MeasurementType
Radiance
TemporalDescription
TimeSpan
StartDate
2002-01-08 00:00:00.000
StopDate
2007-12-11 00:05:38.000
ObservedRegion
Earth.NearSurface.Thermosphere
ObservedRegion
Earth.NearSurface.Ionosphere
ObservedRegion
Earth.NearSurface.AuroralRegion
Keywords
TIMED
GUVI
Imaging
Disk
lower thermosphere
ionosphere
MLTI
Parameter #1
Name
Starting Time
ParameterKey
Starting_Time
Description
Starting date/time of file's observation encoded in a 13-digit string and stored as a single netCDF global attribute.
Units
yyyydoyhhmmss
Structure
Size
1
Description
Dimensions: [1] - this parameter is a single element per file.
Support
Parameter #2
Name
Stopping Time
ParameterKey
Stopping_Time
Description
Stopping date/time of file's observation encoded in a 13-digit string and stored as a single netCDF global attribute.
Units
yyyydoyhhmmss
Structure
Size
1
Description
Dimensions: [1] - this parameter is a single element per file.
Support
Parameter #3
Name
Day of Year
ParameterKey
DOY
Description
Date of observation in number of days since start of current year.
Units
days
Structure
Size
0
Description
Dimensions: [NumPhiBins] - where NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
ValidMin
1
ValidMax
366
Support
Parameter #4
Name
Time
ParameterKey
Time
Description
Time of observation in number of milliseconds since start of current day. Timestamp marks beginning of interval
Units
ms
UnitsConversion
1e-3>s
Structure
Size
0
Description
Dimensions: [NumPhiBins] - where NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
ValidMin
0
ValidMax
86399999
Support
Parameter #5
Name
Detector
ParameterKey
Detector
Description
Detector # of detector being used
Units
unitless
Structure
Size
0
Description
Dimensions: [NumPhiBins] - where NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
ValidMin
1
ValidMax
2
Support
Parameter #6
Name
Slit position
ParameterKey
Slit
Description
Slit position being used where 0 = closed, 1 = wide, 2 = medium, 3 = narrow, and 4 = unknown.
Units
unitless
Structure
Size
0
Description
Dimensions: [NumPhiBins] - where NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
ValidMin
0
ValidMax
4
Support
SupportQuantity
InstrumentMode
Parameter #7
Name
Geographic Latitude
ParameterKey
GeographLat
Description
Geographic latitude of pixel center of 25-km x 25-km bin
Units
degrees
Structure
Size
0
Description
Dimensions: [NumThetaBins,NumPhiBins] - where NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
ValidMin
-90.0
ValidMax
90.0
Support
SupportQuantity
Positional
Parameter #8
Name
Geographic Longitude
ParameterKey
GeographLon
Description
Geographic longitude of pixel center of 25-km x 25-km bin
Units
degrees
Structure
Size
0
Description
Dimensions: [NumThetaBins,NumPhiBins] - where NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
ValidMin
-180.0
ValidMax
180.0
Support
SupportQuantity
Positional
Parameter #9
Name
Geomagnetic Latitude
ParameterKey
GeomagLat
Description
Geomagnetic latitude of pixel center of 25-km x 25-km bin
Units
degrees
Structure
Size
0
Description
Dimensions: [NumThetaBins,NumPhiBins] - where NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
ValidMin
-90.0
ValidMax
90.0
Support
SupportQuantity
Positional
Parameter #10
Name
Geomagnetic Longitude
ParameterKey
GeomagLon
Description
Geomagnetic longitude of pixel center of 25-km x 25-km bin
Units
degrees
Structure
Size
0
Description
Dimensions: [NumThetaBins,NumPhiBins] - where NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
ValidMin
-180.0
ValidMax
180.0
Support
SupportQuantity
Positional
Parameter #11
Name
Imaging Mode Disk Radiance Data
ParameterKey
RadianceData
Description
Radiance of each of 5 colors (1216, 1304, 1356 A, LBH1 and LBH2) has been geolocated at a 150 km altitude, gridded and binned to a 25 km X 25 km resolution.
Units
Rayleighs
Structure
Size
5 2
Description
Dimensions: [5,2,NumThetaBins,NumPhiBins] - where 5 is the nmber of colors (NumColors); 2 is the number of rectification types (NumRectificationTypes); NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
Wave
WaveType
Electromagnetic
WaveQuantity
Wavelength
WavelengthRange
Low
121.6
High
180.0
Units
nm
Bin
BandName
HI (121.6)
Low
121.6
High
121.6
Bin
BandName
OI (130.4)
Low
130.4
High
130.4
Bin
BandName
OI (135.6)
Low
135.6
High
135.6
Bin
BandName
N2 Lyman-Birge-Hopfield (LBH (1))
Low
140
High
150
Bin
BandName
N2 Lyman-Birge-Hopfield (LBH (2))
Low
165
High
180
Parameter #12
Name
Pierce Point Altitude
ParameterKey
PiercePointAlt
Description
Pierce Point Altitude
Units
km
Structure
Size
0
Description
Dimensions: [NumThetaBins,NumPhiBins] - where NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
Support
Parameter #13
Name
Solar Zenith Angle
ParameterKey
SolarZenithAngle
Description
Solar Zenith Angle
Units
degrees
Structure
Size
0
Description
Dimensions: [NumThetaBins,NumPhiBins] - where NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
ValidMin
-90
ValidMax
90
Support
Parameter #14
Name
Data Region
ParameterKey
DataRegion
Description
Data Region where Bit 0: Dayside 0°<SZA<90°; Bit 1: Nightside 110°<SZA<180°; Bit 2: Twilight 90°<SZA<110°; Bit 3: Polar Region 50° < Geomaglat < 90°; Bit 4: Equatorial Region 0°< Geomaglat <50°; Bit 5,6: Unused; Bit 7: Unknown region. Valid values are [1 = daylight; 2 = night; 4 = twilight; 8 = Polar; 9 = Daylight Polar; 10 = Night Polar; 12 = Twilight polar; 16 = Equatorial; 17 = Daylight equatorial; 18 = night equatorial; 20 = twilight equatorial; 128 = Geolocation error]
Units
unitless
Structure
Size
0
Description
Dimensions: [NumThetaBins,NumPhiBins] - where NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
ValidMin
1
ValidMax
128
Support
Parameter #15
Name
Data Quality Indicator
ParameterKey
DQI
Description
Data Quality Indicator stored as bit-encoded integers where Bits 0-6 are unused; Bit 7: 1 = No Data, 0 = Valid Pixel Data.
Units
unitless
Structure
Size
0
Description
Dimensions: [NumThetaBins,NumPhiBins] - where NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
Support
Parameter #16
Name
Systematic Error
ParameterKey
SystematicError
Description
Systematic uncertainty where values of NaNs are given if there is no pixel data
Units
Rayleighs
Structure
Size
5 2
Description
Dimensions: [5,2,NumThetaBins,NumPhiBins] - where 5 is the nmber of colors (NumColors); 2 is the number of rectification types (NumRectificationTypes); NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
FillValue
NaN
Support
Parameter #17
Name
Statistical Error
ParameterKey
StatisticalError
Description
Statistical uncertainty where values of NaNs are given if there is no pixel data
Units
Rayleighs
Structure
Size
5 2
Description
Dimensions: [5,2,NumThetaBins,NumPhiBins] - where 5 is the nmber of colors (NumColors); 2 is the number of rectification types (NumRectificationTypes); NumThetaBins is the number of across-track bins (nominally 119); NumPhiBins is the number of along-track bins (nominally 1647) in an orbital file.
FillValue
NaN
Support
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