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NumericalData

ResourceID
spase://NASA/NumericalData/GOLD/L2/TDISK/PT8S
ResourceHeader
ResourceName
Gold Level L2 ratio of the column abundance of thermospheric O relative to N2
ReleaseDate
2023-10-09 12:34:56.789
RevisionHistory
RevisionEvent
ReleaseDate
2020-09-14 16:47:17
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2023-10-09 12:34:56.789
Note
Added complete CDAWeb and HAPI AccessInformation, metadata versioned up to SPASE 2.6.0, LFB 20231009
Description

The GOLD daytime disk scan measurements are used to derive the TDISK data product, which is the effective disk neutral temperature at a height of approximately 150 km. TDISK is derived for each valid dayside Level 1C pixel for approximately 68 disk scan measurements performed per day by GOLD in nominal operation.

Algorithm heritage

The retrieval algorithm is an extension of those previously used to derive temperature from limb measurements of LBH intensity from the HITS instrument (Aksnes et al., [2006]; Krywonos et al. [2012]).

Algorithm theoretical basis

GOLD measurements have a higher signal-to-noise ratio than HITS and a spectral range that includes more of the total N2 LBH emission (132 - 162 nm). Effective neutral temperatures near ~150 km altitude are retrieved by fitting the observed rotational structure of the N2 LBH bands using an optimal estimation routine. Retrieved parameters also include the upper vibrational level (v'=0-6) relative intensities (i.e. populations), a constant background, wavelength shift, and wavelength dispersion (constant term).

References

Aksnes, A., R. Eastes, S. Budzien, and K. Dymond (2006), Neutral temperatures in the lower thermosphere from N2 Lyman-Birge-Hopfield (LBH) band profiles, Geophys. Res. Lett., 33, L15103, doi:10.1029/2006GL026255.

Krywonos, A., D. J. Murray, R. W. Eastes, A. Aksnes, S. A. Budzien, and R. E. Daniell (2012), Remote sensing of neutral temperatures in the Earth's thermosphere using the Lyman-Birge-Hopfield bands of N2: Comparisons with satellite drag data, J. Geophys. Res., 117, A09311, doi:10.1029/2011JA017226.

Acknowledgement
National Aeronautics and Space Administration; Dr. Richard Eastes
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/Richard.Eastes
2.MetadataContactspase://SMWG/Person/James.M.Weygand
InformationURL
Name
GOLD Homepage web page
URL
Description

GOLD web page with news and other information.

InformationURL
Name
GOLD Missions Space Science Reviews Article
URL
Description

Eastes, R.W., McClintock, W.E., Burns, A.G. et al. Space Sci. Rev. (2017) vol. 212, pp.383.

PriorIDs
spase://VSPO/NumericalData/GOLD/L2/TDISK/PT8S
spase://NASA/NumericalData/SES-14/GOLD/L2/TDISK/PT8S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
ProductKey
GOLD_L2_TDISK
Description

In CDF via ftps from SPDF

AccessURL
Name
HTTPS from SPDF
URL
ProductKey
GOLD_L2_TDISK
Description

In CDF via https from SPDF

AccessURL
Name
CDAWeb
URL
ProductKey
GOLD_L2_TDISK
Description

Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb

Format
CDF
Encoding
None
Acknowledgement
Space Physics Data Facility of the NASA Goddard Space Flight Center; Robert M. Candey
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
GOLD_L2_TDISK
Description

Web Service to this product using the HAPI interface

Format
CSV
Acknowledgement
Space Physics Data Facility of the NASA Goddard Space Flight Center; Robert M. Candey
ProcessingLevel
Calibrated
ProviderName
GOLD
ProviderResourceName
Gold Level L2 Neutral Temperature
ProviderProcessingLevel
Level 2
ProviderVersion
1
InstrumentIDs
MeasurementType
ImageIntensity
TemporalDescription
TimeSpan
StartDate
2018-10-06 00:00:00
RelativeStopDate
P1D
Cadence
PT8S
ObservedRegion
Earth.NearSurface.Ionosphere
Keywords
O relative to N2
GOLD
SES-14
Parameter #1
Name
Mask Wavelength
ParameterKey
mask_wavelength
Description

Wavelength grid for N2_LBH mask.

Cadence
PT8S
Units
nm
ValidMin
130
ValidMax
170
FillValue
9.9692e+36
Wave
WaveType
Photon
Qualifier
Scalar
WaveQuantity
Wavelength
Parameter #2
Name
Effective Altitude
ParameterKey
effective_altitude
Description

Effective altitude of retrieved temperature.

Cadence
PT8S
Units
km
ValidMin
0
ValidMax
1000
FillValue
9.9692e+36
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #3
Name
Lookup Table
ParameterKey
lookup_table
Description

Retrieval lookup table filename.

Cadence
PT8S
Support
SupportQuantity
Other
Parameter #4
Name
Random Uncertainty in Neutral Temperature
ParameterKey
tdisk_unc_ran
Description

Random uncertainty in retrieved neutral temperature.

Cadence
PT8S
Units
K
ValidMin
0
ValidMax
100000
FillValue
9.9692e+36
Particle
ParticleType
Molecule
Qualifier
Uncertainty
ParticleQuantity
Temperature
Parameter #5
Name
Retrieved Wavelength Stretch Parameter
ParameterKey
wavelength_stretch
Description

Retrieved wavelength stretch parameter in each pixel.

Cadence
PT8S
Units
nm
ValidMin
0
ValidMax
10
FillValue
9.9692e+36
Wave
WaveType
Photon
Qualifier
Scalar
WaveQuantity
Wavelength
Parameter #6
Name
Channel
ParameterKey
channel
Description

GOLD channel ('A' or 'B').

Cadence
PT8S
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #7
Name
Latitude
ParameterKey
latitude
Description

Pixel latitude.

Cadence
PT8S
Units
degrees
ValidMin
-90
ValidMax
90
FillValue
9.9692e+36
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #8
Name
Overall Quality Flag
ParameterKey
dqi
Description

Tdisk data quality index (GOLD Public Science Data Products Guide).

Cadence
PT8S
ValidMin
0
ValidMax
2147483647
FillValue
-2147483647
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #9
Name
Scan Start Time
ParameterKey
scan_start_time
Description

UTC start time of scan, e.g., "2017-06-21T23:46:38.015Z".

Cadence
PT8S
Units
date/time
FillValue
' '
Support
Qualifier
Scalar
SupportQuantity
Temporal
Parameter #10
Name
Solar Zenith Angle at 225 km
ParameterKey
solar_zenith_angle
Description

Pixel solar zenith angle.

Cadence
PT8S
Units
degrees
ValidMin
0
ValidMax
180
FillValue
9.9692e+36
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #11
Name
Systematic Uncertainty in Neutral Temperature
ParameterKey
on2_unc_sys
Description

Systematic uncertainty in retrieved neutral temperature.

Cadence
PT8S
Units
K
ValidMin
0
ValidMax
5
FillValue
9.9692e+36
Support
Qualifier
Uncertainty
SupportQuantity
Other
Parameter #12
Name
Neutral Temperature
ParameterKey
tdisk
Description

Retrieved neutral temperature.

Cadence
PT8S
Units
K
ValidMin
0
ValidMax
100000
FillValue
9.9692e+36
Particle
ParticleType
Molecule
ParticleQuantity
Temperature
AtomicNumber
14
Parameter #13
Name
UTC time
ParameterKey
time_utc
Description

UTC date/time string: "2017-06-21T23:46:38.015Z".

Cadence
PT8S
Units
date/time
FillValue
' '
Support
Qualifier
Scalar
SupportQuantity
Temporal
Parameter #14
Name
Background
ParameterKey
background
Description

Retrieved background per pixel.

Cadence
PT8S
Units
counts
ValidMin
0
ValidMax
1000
FillValue
9.9692e+36
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #15
Name
Retrieved Wavelength Shift Parameter
ParameterKey
wavelength_shift
Description

Retrieved wavelength shift parameter in each pixel.

Cadence
PT8S
Units
nm
ValidMin
0
ValidMax
10
FillValue
9.9692e+36
Wave
WaveType
Photon
Qualifier
Scalar
WaveQuantity
Wavelength
Parameter #16
Name
Longitude
ParameterKey
longitude
Description

Pixel longitude.

Cadence
PT8S
Units
degrees
ValidMin
-180
ValidMax
180
FillValue
9.9692e+36
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #17
Name
Retrieved Vibrational Populations
ParameterKey
vibrational_populations
Description

Retrieved temperature vibrational populations.

Cadence
PT8S
ValidMin
0
ValidMax
1
FillValue
9.9692e+36
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #18
Name
L1C File Name
ParameterKey
input_l1c_file
Description

L1C file name for each occultation.

Cadence
PT8S
FillValue
' '
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #19
Name
Pixel Emission Angle
ParameterKey
emission_angle
Description

Pixel emission angle (relative to zenith).

Cadence
PT8S
Units
degrees
ValidMin
0
ValidMax
90
FillValue
9.9692e+36
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #20
Name
TDisk Quality Flag
ParameterKey
tdisk_dqi
Description

TDISK data quality index per pixel (GOLD Public Science Data Products Guide).

Cadence
PT8S
ValidMin
0
ValidMax
2147483647
FillValue
-2147483647
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #21
Name
Mask Defining LBH Bandpass
ParameterKey
mask_n2_lbh
Description

Wavelength mask defining LBH bandpass used in retrieval.

Cadence
PT8S
ValidMin
0
ValidMax
1
FillValue
-2147483647
Support
SupportQuantity
Other
Parameter #22
Name
Scan Stop Time
ParameterKey
scan_stop_time
Description

UTC stop time of scan, e.g., "2017-06-21T23:46:38.015Z".

Cadence
PT8S
Units
date/time
FillValue
' '
Support
Qualifier
Scalar
SupportQuantity
Temporal
Parameter #23
Name
Model Uncertainty in Neutral Temperature
ParameterKey
tdisk_unc_mod
Description

Model uncertainty in retrieved neutral temperature.

Cadence
PT8S
Units
K
ValidMin
0
ValidMax
5
FillValue
9.9692e+36
Support
Qualifier
Uncertainty
SupportQuantity
Other
Parameter #24
Name
Hemisphere Scanned
ParameterKey
hemisphere
Description

Hemisphere scanned ('N' or 'S').

Cadence
PT8S
FillValue
' '
Support
Qualifier
Scalar
SupportQuantity
Other