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TIMED SEE Level2 XPS Solar Irradiance Data

Woods, Thomas N. (2025). TIMED SEE Level2 XPS Solar Irradiance Data [Data set]. Johns Hopkins University Applied Physics Laboratory. https://doi.org/10.48322/t15r-g320 .

Note: Proper references, including those in BibTex or other formats , should include the "Accessed on date" as shown above to identify the version of the resource being cited in a given publication.

ResourceID
spase://NASA/NumericalData/TIMED/SEE/L2_XPS

Description

The 12 X-Ray Photometers (XP) aboard SEE perform full-disk irradiance measurements of the Sun for about 3 minutes every orbit (97 minutes) which usually gives 14-15 measurements per day. 8 of the XPs produce XUV signals (more info on XP coatings) and one other XP provides a hydrogen Lyman-alpha measurement (121.5 nm). The XPS Level 2 data is time averaged over the entire day, after being 1-AU corrected and removing flares. The 1-AU correction is provided.

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Details

Version:2.7.1

MetadataRightsList

Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
SPDX
RightsIdentifier
CC0-1.0
RightsURI
https://spdx.org/licenses/CC0-1.0.html
RightsName
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions

Version:2.7.1

NumericalData

ResourceID
spase://NASA/NumericalData/TIMED/SEE/L2_XPS
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
TIMED SEE Level2 XPS Solar Irradiance Data
DOI
https://doi.org/10.48322/t15r-g320
ReleaseDate
2026-07-21 12:08:11Z
RevisionHistory
RevisionEvent
ReleaseDate
2020-07-07 21:15:38Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-11-14 16:01:52Z
Note
Added PublicationInfo. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB
RevisionEvent
ReleaseDate
2025-12-04 13:32:07Z
Note
Added MetadataRightsList. Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-02-16 14:46:14Z
Note
Added DOI. TLK
RevisionEvent
ReleaseDate
2026-06-26 13:29:57Z
Note
Add 'Z' to TemporalDescription:TimeSpan:StartDate. ZCB
RevisionEvent
ReleaseDate
2026-07-21 12:08:11Z
Note
Added HelioData InformationURL. JWL
Description

The 12 X-Ray Photometers (XP) aboard SEE perform full-disk irradiance measurements of the Sun for about 3 minutes every orbit (97 minutes) which usually gives 14-15 measurements per day. 8 of the XPs produce XUV signals (more info on XP coatings) and one other XP provides a hydrogen Lyman-alpha measurement (121.5 nm). The XPS Level 2 data is time averaged over the entire day, after being 1-AU corrected and removing flares. The 1-AU correction is provided.

Acknowledgement
NASA, Thomas N. Woods
PublicationInfo
Authors
Woods, Thomas N.
PublicationDate
2025-11-14 16:01:52Z
PublishedBy
Johns Hopkins University Applied Physics Laboratory
Contacts
Role Person StartDate StopDate Note
1. PrincipalInvestigator spase://SMWG/Person/Thomas.N.Woods
InformationURL
Name
L2 XPS Data Information
URL
http://lasp.colorado.edu/home/see/data/daily-averages/level-2-xps/
InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/TIMED_SEE_L2_XPS
Description

The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.

PriorIDs
spase://VITMO/NumericalData/TIMED/SEE/L2_XPS
spase://VSPO/NumericalData/TIMED/SEE/L2_XPS
AccessInformation
RepositoryID
spase://SMWG/Repository/TIMED/SEE_POC
Availability
Online
AccessRights
Open
AccessURL
Name
SEE Data Products web page
URL
http://lasp.colorado.edu/home/see/data/
Description

This web page allows the request of data files for this product. To request data: for the XPS data type of interest, click the year of interest to go the the ftp directory of files and download the desired day-long file by clicking on it.

Format
NetCDF
Encoding
None
Acknowledgement
NASA, Thomas N. Woods
ProcessingLevel
Calibrated
ProviderResourceName
SEE Level 2 XPS Solar Irradiance data
ProviderProcessingLevel
Level 2
ProviderVersion
10
InstrumentIDs
spase://SMWG/Instrument/TIMED/SEE
MeasurementType
Irradiance
TemporalDescription
TimeSpan
StartDate
2002-01-22 00:00:00.000Z
RelativeStopDate
P2D
ObservedRegion
Sun
Keywords
TIMED
SEE
XPS
Sun
Parameter #1
Name
Date of observation
ParameterKey
DATE
Description

Date of observation

Units
YYYY-DOY
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #2
Name
Channel index
ParameterKey
CHANNEL
Description

Channel index of the 12 XUV Photometers (1-12)

Units
NONE
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #3
Name
Bandpass wavelength range
ParameterKey
WAVE(structure_elements, dim1_WAVE)
Description

Bandpass wavelength range

Units
nm
Structure
Size
9 2
Description

Dimensions: [Number_of_bandpass_wavelength_ranges, Bandpass_wavelength_range_limits] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges, and Bandpass_wavelength_range_limits is the pair of values specifying the lower and upper wavelength limits.

Support
SupportQuantity
Other
Parameter #4
Name
XPS median solar irradiance
ParameterKey
FLUX_MEDIAN
Description

Solar irradiance - median for the day

Units
W / m^2
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Wave
WaveType
Electromagnetic
WaveQuantity
Wavelength
WavelengthRange
Low
0.1
High
122.0
Units
nm
Bin
BandName
Channel 1: Ti/C-14 coating
Low
0.1
High
7
Bin
BandName
Channel 2: Ti/C-10 coating
Low
0.1
High
7
Bin
BandName
Channel 3: Al/Sc/C-24 coating
Low
17
High
23
Bin
BandName
Channel 5: Ti/Pd-17 coating
Low
0.1
High
10
Bin
BandName
Channel 6: Ti/Zr/Au-04 coating
Low
0.1
High
10
Bin
BandName
Channel 7: Al/Nb/C-03 coating
Low
17
High
21
Bin
BandName
Channel 9: Al/Mn-06 coating
Low
0.1
High
7
Bin
BandName
Channel 10: Cr/Al-07 coating
Low
0.1
High
7.0
Bin
BandName
Channel 11: Lyman-alpha
Low
121
High
122
Parameter #5
Name
Difference of median and weighted average solar irradiance
ParameterKey
DIFF_MA
Description

Difference of median and weighted average solar irradiance over the day

Units
W / m^2
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #6
Name
Accuracy of solar irradiance
ParameterKey
ERR_TOT
Description

Accuracy of solar irradiance averaged over the day

Units
Fractional
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #7
Name
Measurement precision
ParameterKey
ERR_MEAS
Description

Measurement precision averaged over the day

Units
Fractional
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #8
Name
Standard deviation of median for good measurements
ParameterKey
STDEV_MEAS
Description

Standard deviation of median for good measurements

Units
Fractional
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #9
Name
AU correction factor
ParameterKey
COR_1AU
Description

AU correction factor for date

Units
1 / (AU^2)
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #10
Name
Median of Total-Dark-Visible currents
ParameterKey
CURRENT
Description

Median of Total-Dark-Visible currents from level 1 with FOV and 1-AU corrections applied

Units
nanoAmps
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #11
Name
Number of measurements used
ParameterKey
NUMPT
Description

Number of measurements used in daily average

Units
NONE
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #12
Name
Instrument degradation correction factor
ParameterKey
COR_DEGRADE
Description

Instrument degradation correction factor

Units
Fractional
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #13
Name
Degradation function linear extrapolation/interpolation flag
ParameterKey
DEGRADE_MODEL
Description

Long value = 1 if degradation function is linearly extrapolated, 0 if linearly interpolated

Units
None
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #14
Name
Atmospheric correction factors average
ParameterKey
COR_ATMOS.AVG
Description

Average of atmospheric correction factors

Units
Fractional
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #15
Name
Atmospheric correction factors minimum
ParameterKey
COR_ATMOS.MIN
Description

Minimum of atmospheric correction factors

Units
Fractional
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other
Parameter #16
Name
Atmospheric correction factors maximum
ParameterKey
COR_ATMOS.MAX
Description

Maximum of atmospheric correction factors

Units
Fractional
Structure
Size
9
Description

Dimensions: [Number_of_bandpass_wavelength_ranges] - where Number_of_bandpass_wavelength_ranges is the number of bandpass wavelength ranges.

Support
SupportQuantity
Other