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Gold Level L2 Peak Electron Density

ResourceID
spase://NASA/NumericalData/GOLD/L2/NMAX/PT900S

Description

The GOLD night disk scan (NI1) measurements are used to derive the peak electron density (NMAX, electrons/cm3) on the disk. GOLD performs NI1 scans in both hemispheres from 17:00 to 21:00 hours spacecraft local time each night. NMAX is retrieved on a 2D rectangular (latitude vs. longitude) grid of fixed dimensions for each scan. However, the actual latitude and longitude values in the grid vary from scan to scan as the NI1 sequence utilizes a pattern of short (15 minute) localized scans that progress from east to west across the disk throughout the sequence.

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Details

Version:2.6.0

NumericalData

ResourceID
spase://NASA/NumericalData/GOLD/L2/NMAX/PT900S
ResourceHeader
ResourceName
Gold Level L2 Peak Electron Density
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 night disk scan (NI1) measurements are used to derive the peak electron density (NMAX, electrons/cm3) on the disk. GOLD performs NI1 scans in both hemispheres from 17:00 to 21:00 hours spacecraft local time each night. NMAX is retrieved on a 2D rectangular (latitude vs. longitude) grid of fixed dimensions for each scan. However, the actual latitude and longitude values in the grid vary from scan to scan as the NI1 sequence utilizes a pattern of short (15 minute) localized scans that progress from east to west across the disk throughout the sequence.

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
https://gold.cs.ucf.edu/
Description

GOLD web page with news and other information

InformationURL
Name
GOLD Missions Space Science Reviews Article
URL
https://doi.org/10.1007/s11214-017-0392-2
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/NMAX/PT900S
spase://NASA/NumericalData/SES-14/GOLD/L2/NMAX/PT900S
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/gold/level2/nmax/
ProductKey
GOLD_L2_NMAX
Description

In CDF via ftps from SPDF

AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/gold/level2/nmax/
ProductKey
GOLD_L2_NMAX
Description

In CDF via https from SPDF

AccessURL
Name
CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=GOLD_L2_NMAX&index=sp_phys
ProductKey
GOLD_L2_NMAX
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
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
https://cdaweb.gsfc.nasa.gov/hapi
Style
HAPI
ProductKey
GOLD_L2_NMAX
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 Molecular Oxygen Density Profile
ProviderProcessingLevel
Level 2
ProviderVersion
1
InstrumentIDs
spase://SMWG/Instrument/GOLD
MeasurementType
ImageIntensity
TemporalDescription
TimeSpan
StartDate
2018-10-06 00:00:00
RelativeStopDate
P1D
Cadence
PT900S
ObservedRegion
Earth.NearSurface.Ionosphere
Keywords
O relative to N2
GOLD
SES-14
Parameter #1
Name
Mask Defining OI 1356 Bandpass
ParameterKey
mask_oi_1356
Description

Wavelength mask defining the 135.6-nm emission passband

Cadence
PT900S
Structure
Size
4001
ValidMin
0
ValidMax
1
FillValue
-2147483647
Support
SupportQuantity
Other
Parameter #2
Name
Mask Wavelength
ParameterKey
mask_wavelength
Description

Wavelength grid for 1356 mask

Cadence
PT900S
Units
nm
Structure
Size
4001
ValidMin
130
ValidMax
170
FillValue
9.9692e+36
Wave
WaveType
Photon
Qualifier
Scalar
WaveQuantity
Wavelength
Parameter #3
Name
OI 1356 brightness
ParameterKey
radiance_oi_1356
Description

Radiance in Oxygen 135.6-nm bandpass

Cadence
PT900S
Units
Rayleighs/nm
Structure
Size
51 100 6
ValidMin
0
ValidMax
100000
FillValue
9.9692e+36
Wave
WaveType
Photon
Qualifier
Scalar
WaveQuantity
Intensity
Parameter #4
Name
GOLD channel
ParameterKey
channel
Description

GOLD channel ('A' or 'B')

Cadence
PT900S
Structure
Size
50 6
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #5
Name
Random Uncertainty in NMAX
ParameterKey
nmax_unc_ran
Description

Random uncertainty in retrieved peak electron density

Cadence
PT900S
Units
electrons/cm^3
Structure
Size
51 100 6
ValidMin
0
ValidMax
1000000000
FillValue
9.9692e+36
Support
Qualifier
Uncertainty
SupportQuantity
Other
Parameter #6
Name
Model Uncertainty in NMAX
ParameterKey
nmax_unc_mod
Description

Model uncertainty in retrieved peak electron density

Cadence
PT900S
Units
electrons/cm^3
Structure
Size
51 100 6
ValidMin
0
ValidMax
1000000000
FillValue
9.9692e+36
Support
Qualifier
Uncertainty
SupportQuantity
Other
Parameter #7
Name
Latitude
ParameterKey
latitude
Description

Pixel latitude

Cadence
PT900S
Units
degrees
Structure
Size
51 100 6
ValidMin
-90
ValidMax
90
FillValue
9.9692e+36
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #8
Name
Random Uncertainty in Oxygen 135.6 nm Brightness
ParameterKey
oi_1356_unc_ran
Description

Random uncertainty in oxygen 135.6 nm brightness

Cadence
PT900S
Units
Rayleighs/nm
Structure
Size
51 100 6
ValidMin
0
ValidMax
100000
FillValue
9.9692e+36
Wave
WaveType
Photon
Qualifier
Uncertainty
WaveQuantity
Intensity
Parameter #9
Name
Counts in Oxygen Bandpass
ParameterKey
counts_oi_1356
Description

Counts in Oxygen 135.6-nm bandpass

Cadence
PT900S
Units
counts
Structure
Size
51 100 6
ValidMin
0
ValidMax
100000
FillValue
9.9692e+36
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #10
Name
Overall Quality Flag
ParameterKey
dqi
Description

NMAX data quality index (see table below)

Cadence
PT900S
Structure
Size
6
ValidMin
0
ValidMax
2147483647
FillValue
-2147483647
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #11
Name
Scan Start Time
ParameterKey
scan_start_time
Description

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

Cadence
PT900S
Structure
Size
50 6
FillValue
' '
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #12
Name
NMAX Quality Flag
ParameterKey
nmax_dqi
Description

NMAX data quality index (see table below)

Cadence
PT900S
Structure
Size
50 100 6
ValidMin
0
ValidMax
2147483647
FillValue
-2147483647
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #13
Name
Solar Zenith Angle at 225 km
ParameterKey
solar_zenith_angle
Description

Solar zenith angle at 225 km tangent point

Cadence
PT900S
Units
degrees
Structure
Size
51 100 6
ValidMin
0
ValidMax
180
FillValue
9.9692e+36
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #14
Name
Longitude
ParameterKey
longitude
Description

Pixel longitude

Cadence
PT900S
Units
degrees
Structure
Size
51 100 6
ValidMin
-180
ValidMax
180
FillValue
9.9692e+36
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #15
Name
UTC time
ParameterKey
time_utc
Description

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

Cadence
PT900S
Structure
Size
50 51 6
FillValue
' '
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #16
Name
NMAX
ParameterKey
nmax_unc_mod
Description

Retrieved peak electron density

Cadence
PT900S
Units
electrons/cm^3
Structure
Size
51 100 6
ValidMin
0
ValidMax
1000000000
FillValue
9.9692e+36
Support
Qualifier
Uncertainty
SupportQuantity
Other
Parameter #17
Name
L1C File Name
ParameterKey
input_l1c_file
Description

L1C file name for each occultation

Cadence
PT900S
Structure
Size
50 6
FillValue
' '
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #18
Name
Pixel Emission Angle
ParameterKey
emission_angle
Description

Pixel emission angle (relative to zenith)

Cadence
PT900S
Units
degrees
Structure
Size
51 100 6
ValidMin
0
ValidMax
90
FillValue
9.9692e+36
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #19
Name
Scan Stop Time
ParameterKey
scan_stop_time
Description

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

Cadence
PT900S
Units
date/time
Structure
Size
50 6
FillValue
' '
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #20
Name
Systematic Uncertainty in Oxygen 135.6 nm Brightness
ParameterKey
oi_1356_unc_sys
Description

Systematic uncertainty in oxygen 135.6 nm brightness

Cadence
PT900S
Units
Rayleighs
Structure
Size
51 100 6
ValidMin
0
ValidMax
100000
FillValue
9.9692e+36
Wave
WaveType
Photon
Qualifier
Uncertainty
WaveQuantity
Intensity
Parameter #21
Name
Hemisphere Scanned
ParameterKey
hemisphere
Description

Hemisphere scanned ('N' or 'S')

Cadence
PT900S
Structure
Size
50 6
FillValue
' '
Support
Qualifier
Scalar
SupportQuantity
Other