HDPWS

ICON Michelson Interferometer for Global High-resolution Thermospheric Imaging Viewing Direction B Temperature

(2023). ICON Michelson Interferometer for Global High-resolution Thermospheric Imaging Viewing Direction B Temperature. [Data set]. NASA Space Physics Data Facility. https://doi.org/10.48322/zrhc-pb76. Accessed on .

Note: Proper references, including 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/ICON/MIGHTI/L2/B/Temperature/PT30S

Description
MIGHTI samples the O2 A band spectral region at five different wavelengths in order to both measure the shape of the band and to specify a background radiance that is subtracted from the signal. The wavelengths of the filter passbands are selected to maximize the sensitivity to lower thermospheric temperature variations. The temperature measurement is accomplished by a multichannel photometric measurement of the spectral shape of the molecular oxygen A-band around 762 nm wavelength. For each field of view, the signals of the two oxygen lines and the A-band are detected on different regions of a single, cooled, frame transfer charge coupled device (CCD) detector. Two filter channels sample either end of the band to define a background (754.1 nm and 780.1 nm) and three more sample its shape (760.0 nm, 762.8 nm and 765.2 nm). Using three filters that sample the band shape allows the simultaneous retrieval of the atmospheric temperature and common shifts in the center wavelengths of the pass bands due to thermal drifts of the filters. On-board calibration sources are used to periodically quantify thermal drifts, simultaneously with observing the atmosphere.

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NumericalData

ResourceID
spase://NASA/NumericalData/ICON/MIGHTI/L2/B/Temperature/PT30S
ResourceHeader
ResourceName
ICON Michelson Interferometer for Global High-resolution Thermospheric Imaging Viewing Direction B Temperature
AlternateName
MIGHTI B Temperature
DOI
https://doi.org/10.48322/zrhc-pb76
ReleaseDate
2024-05-02 00:00:00Z
RevisionHistory
RevisionEvent
ReleaseDate
2023-08-01 00:00:00Z
Note
Added DOI and PublicationInfo minted by JMW on 20230801. Updated SPASE version.
RevisionEvent
ReleaseDate
2024-01-22 00:00:00Z
Note
Updated PublicationInfo Authors. JMW.
RevisionEvent
ReleaseDate
2024-05-02 00:00:00Z
Note
Edited AccessInformation. JMW
Description
MIGHTI samples the O2 A band spectral region at five different wavelengths in order to both measure the shape of the band and to specify a background radiance that is subtracted from the signal. The wavelengths of the filter passbands are selected to maximize the sensitivity to lower thermospheric temperature variations. The temperature measurement is accomplished by a multichannel photometric measurement of the spectral shape of the molecular oxygen A-band around 762 nm wavelength. For each field of view, the signals of the two oxygen lines and the A-band are detected on different regions of a single, cooled, frame transfer charge coupled device (CCD) detector. Two filter channels sample either end of the band to define a background (754.1 nm and 780.1 nm) and three more sample its shape (760.0 nm, 762.8 nm and 765.2 nm). Using three filters that sample the band shape allows the simultaneous retrieval of the atmospheric temperature and common shifts in the center wavelengths of the pass bands due to thermal drifts of the filters. On-board calibration sources are used to periodically quantify thermal drifts, simultaneously with observing the atmosphere.
Acknowledgement
National Aeronautics and Space Administration; Dr. Brian J. Harding; Dr. Thomas Immel
PublicationInfo
Authors
Stevens, M. H.; Englert, C. R.; Harlander, J. M.; Marr, K. D.; Harding, B. J.; Triplett, C. C.; Mende, S. B.; Immel, T. J.
PublicationDate
2023-01-01 00:00:00
PublishedBy
NASA Space Physics Data Facility
Funding
Agency
National Aeronautics and Space Administration
Project
Explorers Program
AwardNumber
contracts NNG12FA45C and NNG12FA42I
Contacts
Role Person StartDate StopDate Note
1. PrincipalInvestigator spase://SMWG/Person/Brian.J.Harding
2. MetadataContact spase://SMWG/Person/James.M.Weygand

InformationURL
Name
Additional information on ICON
URL
Description
ICON spacecraft Homepage.
InformationURL
Name
Michelson Interferometer for Global High-resolution Thermospheric Imaging (MIGHTI): instrument design and calibration
URL
Description
Space Science Reviews, 212(1-2), pp.553-584. DOI: 10.1007/s11214-017-0358-4
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
ICON_L2-3_MIGHTI-B_TEMPERATURE
Description
Web Service to this product using the HAPI interface.
Format
NetCDF
Acknowledgement
Please acknowledge Dr. Brian J. Harding and Dr. Thomas Immel. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
HTTPS from SPDF
URL
ProductKey
ICON_L2-3_MIGHTI-B_TEMPERATURE
Description
Access to Data in NetCDF Format via https from SPDF
AccessURL
Name
CDAWeb
URL
ProductKey
ICON_L2-3_MIGHTI-B_TEMPERATURE
Description
Access to NetCDFs via NASA/GSFC CDAWeb
Format
NetCDF
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/icon/l2/l2-3_mighti-b_temperature/$Y
AccessFilenameTemplate
icon_l2-3_mighti-b_temperature_$Y$m$d_v05r001.nc
Acknowledgement
Please acknowledge Dr. Brian J. Harding and Dr. Thomas Immel. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb Programmatic Data Access
URL
Style
WebService
ProductKey
ICON_L2-3_MIGHTI-B_TEMPERATURE
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
Please acknowledge Dr. Brian J. Harding and Dr. Thomas Immel. Please acknowledge the Data Providers and CDAWeb when using these Data.
ProcessingLevel
Calibrated
ProviderName
ICON MIGHTI team
InstrumentIDs
MeasurementType
Dopplergram
TemporalDescription
TimeSpan
StartDate
2019-12-06 00:00:00Z
StopDate
2022-11-24 23:59:59Z
Cadence
PT30S
ObservedRegion
Earth.NearSurface.Atmosphere
ObservedRegion
Earth.NearSurface.Ionosphere
Parameter #1
Name
Epoch time
ParameterKey
Epoch
Description
This variable contains the time corresponding to the temperature profiles reported in this file. The variable is in milliseconds since 1970-01-01 00:00:00 UTC at middle of image integration. A human-readable version of the time can be found in the variable ICON_...UTC_Time.
Cadence
PT30S
Units
ms
ValidMin
0
ValidMax
6000000000000
FillValue
6000000000000
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #2
Name
Bad Calibration File Flag
ParameterKey
ICON_L1_MIGHTI_B_Quality_Flag_Bad_Calibration
Description
Quality Flag indicating an inappropriate calibration file has been used or was missing.
Cadence
PT30S
ValidMin
0
ValidMax
1
FillValue
-9999999848243207295109594873856
Support
Qualifier
Scalar
SupportQuantity
DataQuality
Parameter #3
Name
South Atlantic Anomaly Flag
ParameterKey
ICON_L1_MIGHTI_B_Quality_Flag_South_Atlantic_Anomaly
Description
Quality Flag indicating that the spacecraft is within the South Atlantic Anomaly (0 = not in SAA).
Cadence
PT30S
ValidMin
0
ValidMax
1
FillValue
-9999999848243207295109594873856
Support
Qualifier
Scalar
SupportQuantity
DataQuality
Parameter #4
Name
A Band Intensity Scaled
ParameterKey
ICON_L23_MIGHTI_B_ABand_Intensity_Scaled
Description
Derived common scaling of O2 A Band radiances in the 3 signal channels by altitude. Calculated forward radiances are fit to the observations from each of the three signal channels. The scaling is done at each tangent altitude separately and interatively until a best fit solution is found. The intensity of each signal channel relative to the other two determines the temperature, so the scale factor is unitless. The scaling is derived using pre-calculated spectra from the HITRAN 2016 database.
Cadence
PT30S
ValidMin
-9999999848243207295109594873856
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #5
Name
Uncertainty (1-sigma) in A Band Intensity Scaled
ParameterKey
ICON_L23_MIGHTI_B_ABand_Intensity_Scaled_Uncertainty
Description
Derived uncertainty (1-sigma) in derived common scaling of O2 A Band to emergent intensity by altitude.
Cadence
PT30S
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #6
Name
Background Signal per filter
ParameterKey
ICON_L23_MIGHTI_B_Background_Signal
Description
Background Signal by filter by altitude and filter. This has been corrected for flatfield effects across the detector.
Cadence
PT30S
Units
Electrons
ValidMin
-9999999848243207295109594873856
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Particle
ParticleType
Electron
Qualifier
Scalar
ParticleQuantity
Counts
Parameter #7
Name
Background Slope
ParameterKey
ICON_L23_MIGHTI_B_Background_Slope
Description
Derived slope of subtracted background. The slope of the background is saved here for diagnostic purposes. It is calculated by taking the difference of the flatfielded signal from the two background channels and dividing by the difference of the the channel center wavelengths (in nm) of the two background channels (approximately 780 nm - 754 nm). This is done explicitly by [bg2 - bg1]/flatfield/[wavelength2 - wavelength1], where bg2 and bg1 are the observed background signals in electrons.
Cadence
PT30S
Units
/nm
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Wave
WaveType
Photon
Qualifier
Scalar
WaveQuantity
Wavelength
Parameter #8
Name
Total boresight to sun angle
ParameterKey
ICON_L23_MIGHTI_B_Boresight_Sun_Angle
Description
Total boresight to sun angle.
Cadence
PT30S
Units
degrees
ValidMin
0
ValidMax
180
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #9
Name
Field of View Azimuth
ParameterKey
ICON_L23_MIGHTI_B_Field_of_View_Azimuth_Angle
Description
Field of view azimuth angle.
Cadence
PT30S
Units
degrees
ValidMin
-90
ValidMax
90
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #10
Name
Filter Center Wavelength
ParameterKey
ICON_L23_MIGHTI_B_Filter_Center_Wavelength
Description
Filter Center Wavelength used in temperature retrieval (=1e7/FilterCWN).
Cadence
PT30S
Units
nm
ValidMin
750
ValidMax
785
FillValue
-9999999848243207295109594873856
Wave
WaveType
Photon
Qualifier
Scalar
WaveQuantity
Wavelength
Parameter #11
Name
Filter Center Number
ParameterKey
ICON_L23_MIGHTI_B_Filter_Center_Wavenumber
Description
Filter Center Wavenumber used in temperature retrieval as measured in the laboratory and fitted by a Gaussian. These filter center wavenumbers vary with detector (MIGHTI A and MIGHTI B), with altitude as well as with channel. They are also difference for daytime and nighttime operations. It is from these center wavenumbers that the common wavenumber shift (across all channels) is calculated.
Cadence
PT30S
Units
cm^-1
ValidMin
12739
ValidMax
13333
FillValue
-9999999848243207295109594873856
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #12
Name
Filter Wavelength Labels
ParameterKey
ICON_L23_MIGHTI_B_Filter_Wavelengths
Description
Wavelength labels corresponding to the five filters. These are for guidance. Actual values used in retrieval for MIGHTI-A and MIGHTI-B (day/night) are in ICON_L23_MIGHTI_(A or B)_Filter_Center_Wavelength.
Cadence
PT30S
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #13
Name
Filter wavenumber shift
ParameterKey
ICON_L23_MIGHTI_B_Filter_Wavenumber_Shift
Description
Common shift of all filter center wavenumbers due to thermal drift that is added to laboratory measured filter center wavenumbers. The three channels measuring the A band overdetermines the temperature such that the wavenumber registration due to any thermal drift of the instrument can be additionally inferred. This is typically fixed with altitude and determined (along with temperature) from the signal originating from the O2 A band as measured from 3 signal channels.
Cadence
PT30S
Units
cm^-1
ValidMin
-9999999848243207295109594873856
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #14
Name
Filter wavenumber shift uncertainty
ParameterKey
ICON_L23_MIGHTI_B_Filter_Wavenumber_Shift_Uncertainty
Description
Uncertainties (1-sigma) in the shift of all filter center wavenumbers. If the common wavenumber shift is fixed with altitude and prescribed, then this uncertainty is zero everywhere.
Cadence
PT30S
Units
cm^-1
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #15
Name
GPS Time
ParameterKey
ICON_L23_MIGHTI_B_GPS_Time
Description
Milliseconds since 1980-01-06 00:00:00 TAI (coincident with UTC) at middle of image integration. Derived from original GPS values reported from spacecraft (Time_GPS_Seconds and Time_GPS_Subseconds). Time calculation is offset by 615ms (flush time) for the first image in the series and for all other images are adjusted by subtracting (integration time + 308 milliseconds) from the reported GPS time.
Cadence
PT30S
Units
ms
FillValue
-9223372036854775806
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #16
Name
GPS seconds count when image packet header received
ParameterKey
ICON_L23_MIGHTI_B_GPS_Time_Seconds
Description
The header of the first image received in a series 615 ms after start of image processing. Following headers are adjusted by subtracting (integration time + 308 ms) from the reported GPS time.
Cadence
PT30S
Units
seconds
FillValue
-9223372036854775806
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #17
Name
Clock GPS Time Offset
ParameterKey
ICON_L23_MIGHTI_B_GPS_Time_Subseconds
Description
GPS Time in sub seconds, 50 nanosecond offset from GPS seconds from 20 MHz clock.
Cadence
PT30S
Units
50 Nanoseconds
ValidMin
0
ValidMax
100000000
FillValue
-9223372036854775806
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #18
Name
Time to integrate MIGHTI-B region of interest (ROI) image.
ParameterKey
ICON_L23_MIGHTI_B_Integration_Time
Description
MIGHTI Integration Time in millieconds.
Cadence
PT30S
Units
ms
ValidMin
0
ValidMax
4294967294
FillValue
-9223372036854775806
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #19
Name
Relative Radiance per Filter
ParameterKey
ICON_L23_MIGHTI_B_Relative_Radiance
Description
Observed relative radiance by filter and altitude. The retrieval is based on a forward modeling approach to these observed radiances as reported in electrons/s from the MIGHTI L1 product. These are converted to electrons based on the integration time during day (30 s) or night (60 s).
Cadence
PT30S
Units
Electrons
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Particle
ParticleType
Electron
Qualifier
Scalar
ParticleQuantity
Counts
Parameter #20
Name
Uncertainty in Rel Radiance per filter
ParameterKey
ICON_L23_MIGHTI_B_Relative_Radiance_Uncertainty
Description
Uncertainty (1-sigma) in relative radiance by filter by altitude and filter. These are calculated by taking the square root of the total number of electrons in each of the three signal channels, which are 51 pixels wide for MIGHTI-A or MIGHTI-B (day or night).
Cadence
PT30S
Units
Electrons
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Particle
ParticleType
Electron
Qualifier
Uncertainty
ParticleQuantity
Counts
Parameter #21
Name
Tangent Altitude of the Line of Sight
ParameterKey
ICON_L23_MIGHTI_B_Tangent_Altitude
Description
Tangent point altitudes. These altitudes are the tangent altitude of the line of sight of each pixel.
Cadence
PT30S
Units
km
ValidMin
100
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #22
Name
Tangent Point Latitudes by Altitude.
ParameterKey
ICON_L23_MIGHTI_B_Tangent_Latitude
Description
Tangent point latitudes by altitude. Note that these are a function of both epoch and altitude. Note also that due to the nature of the limb observations these latitudes are typically an average over many hundreds of kilometers.
Cadence
PT30S
Units
deg
ValidMin
-90
ValidMax
90
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #23
Name
Local Solar Time at Tangent Point
ParameterKey
ICON_L23_MIGHTI_B_Tangent_Local_Solar_Time
Description
Local solar time (0-24 h) at tangent point calculated using the equation of time. LST is a function of both epoch and altitude.
Cadence
PT30S
Units
hours
ValidMin
0
ValidMax
24
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #24
Name
Tangent Point Longitudes by Altitude.
ParameterKey
ICON_L23_MIGHTI_B_Tangent_Longitude
Description
Tangent point longitudes (0-360) by altitude. Note that these are a function of both epoch and altitude. Note also that due to the nature of the limb observations these longitudes are typically an average over many hundreds of kilometers.
Cadence
PT30S
Units
deg
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #25
Name
Tangent Point Magnetic Latitudes by Altitude.
ParameterKey
ICON_L23_MIGHTI_B_Tangent_Magnetic_Latitude
Description
Tangent point magnetic latitudes by altitude. Quasi-dipole latitude and longitude are calculated using the fast implementation developed by Emmert et al. (2010, doi:10.1029/2010JA015326) and the Python wrapper apexpy (doi.org/10.5281/zenodo.1214207). Quasi-dipole longitude is defined such that zero occurs where the geodetic longitude is near 285 deg east (depending on latitude). Note that these are a function of both epoch and altitude. Note also that due to the nature of the limb observations these latitudes are typically an average over many hundreds of kilometers.
Cadence
PT30S
Units
deg
ValidMin
-90
ValidMax
90
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #26
Name
Tangent Point Magnetic Longitudes by Altitude.
ParameterKey
ICON_L23_MIGHTI_B_Tangent_Magnetic_Longitude
Description
Tangent point magnetic longitudes by altitude. Quasi-dipole latitude and longitude are calculated using the fast implementation developed by Emmert et al. (2010, doi:10.1029/2010JA015326) and the Python wrapper apexpy (doi.org/10.5281/zenodo.1214207). Quasi-dipole longitude is defined such that zero occurs where the geodetic longitude is near 285 deg east (depending on latitude). Note that these are a function of both epoch and altitude. Note also that due to the nature of the limb observations these longitudes are typically an average over many hundreds of kilometers.
Cadence
PT30S
Units
deg
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #27
Name
Solar Zenith Angle at Tangent Point
ParameterKey
ICON_L23_MIGHTI_B_Tangent_Solar_Zenith_Angle
Description
Solar zenith angle at tangent point. SZA is a function of both epoch and altitude.
Cadence
PT30S
Units
degrees
ValidMin
-180
ValidMax
180
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #28
Name
A-Band Temperatures
ParameterKey
ICON_L23_MIGHTI_B_Temperature
Description
Derived temperatures from A band by altitude. Temperatures are retrieved from the rotational distribution of emission lines in the O2 A band. The measurement is made at 5 spectral channels. 3 channels measure the A band and 2 others on either side of the band measure a background, which is subtracted from the 3 signal channels. An entire altitude profile is observed simultaneously. An onion-peeling inversion is used on the raw observations to remove the effects of the integration along the line of sight. See Stevens et al. (Space Science Reviews (2018) 214:4. https://doi.org/10.1007/s11214-017-0434-9). O2 A band spectra are pre-calculated from 100-400 K in 20 K increments based on the HITRAN 2016 database [Gordon et al., JQSRT (2017), 203:3-69.https://doi.org/10.1016/j.jqsrt.06.038] and smoothed filter functions with FWHM of ~2.0 nm. The filter functions are based on Gaussian fits to laboratory measurements and are a function of channel, row (altitude), and column. The fits are separately done for each pixel as a function of peak wavenumber (wavelength), width, and transmittance. For each of the three signal channels the fitted Gaussians are co-added over 51 pixels where the transmittance is largest for a representative filter function for that channel. The transmittances are not absolutely calibrated in photometric units, but the relative transmittance between channels and between detectors is maintained, which allows for the retrieval of temperature at the tangent altitude.
Cadence
PT30S
Units
K
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Particle
ParticleType
Molecule
Qualifier
Scalar
ParticleQuantity
Temperature
AtomicNumber
16
Parameter #29
Name
Temperature Bias Uncertainties
ParameterKey
ICON_L23_MIGHTI_B_Temperature_Bias_Uncertainty
Description
Estimated bias uncertainties in derived temperatures by altitude; aka systematic uncertainties. These uncertainties are present in each temperature profile and are primarily due to 1) a 1 cm-1 uncertainty in the common shift applied to pre-flight laboratory determined filter positions. This uncertainty was tested in the retrieval and a derived fixed uncertainty of 12 K is propagated at all altitudes and 2) the lack of measurements above the top altitude sampled, and altitude dependent, with the topmost altitudes of the retrieval affected the most. The temperature bias uncertainty is found by a root sum square of these two. At most altitudes the estimated bias uncertainty is dominated by the uncertainty in the common shift.
Cadence
PT30S
Units
K
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Particle
ParticleType
Molecule
Qualifier
Uncertainty
ParticleQuantity
Temperature
AtomicNumber
16
Parameter #30
Name
Temperature Statistical Uncertainties
ParameterKey
ICON_L23_MIGHTI_B_Temperature_Statistical_Uncertainty
Description
Statistical uncertainties (one sigma) in derived temperatures by altitude.
Cadence
PT30S
Units
K
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Particle
ParticleType
Molecule
Qualifier
Uncertainty
ParticleQuantity
Temperature
AtomicNumber
16
Parameter #31
Name
Total Uncertainties in Derived Temperatures by Altitude
ParameterKey
ICON_L23_MIGHTI_B_Temperature_Total_Uncertainty
Description
Total uncertainties in derived temperatures by altitude: Here the statistical temperature uncertainty has been linearly added to the estimated temperature bias.
Cadence
PT30S
Units
K
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Particle
ParticleType
Molecule
Qualifier
Uncertainty
ParticleQuantity
Temperature
AtomicNumber
16
Parameter #32
Name
Thermal Electric Cooler Cold Temperature
ParameterKey
ICON_L23_MIGHTI_B_Thermal_Electric_Cooler_Cold_Temperature
Description
Cold-side temperature of the thermoelectric cooler attached to the camera head.
Cadence
PT30S
Units
C
ValidMin
-9999999848243207295109594873856
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #33
Name
UTC time
ParameterKey
ICON_L23_MIGHTI_B_UTC_Time
Description
This variable is the same as Epoch but is formatted as a human-readable string.
Cadence
PT30S
Units
' '
FillValue
-9999999848243207295109594873856
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #34
Name
UTC Start time
ParameterKey
ICON_L23_MIGHTI_B_UTC_Time_Start
Description
Milliseconds since 1970-01-01 00:00:00 UTC at start of image integration. Derived from original GPS values reported from spacecraft (Time_GPS_Seconds and Time_GPS_Subseconds). Time calculation is offset by 615ms (flush time) for the first image in the series and for all other images are adjusted by subtracting (integration time + 308 milliseconds) from the reported GPS time.
Cadence
PT30S
Units
' '
FillValue
-9999999848243207295109594873856
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #35
Name
UTC Stop time
ParameterKey
ICON_L23_MIGHTI_B_UTC_Time_Stop
Description
Milliseconds since 1970-01-01 00:00:00 UTC at end of image integration. Derived from original GPS values reported from spacecraft (Time_GPS_Seconds and Time_GPS_Subseconds). Time calculation is offset by 615ms (flush time) for the first image in the series and for all other images are adjusted by subtracting (integration time + 308 milliseconds) from the reported GPS time.
Cadence
PT30S
Units
' '
FillValue
-9999999848243207295109594873856
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #36
Name
MIGHTI-B Aperture Position 1
ParameterKey
ICON_L23_MIGHTI_Aperture_1_Position
Description
Aperture Position 1: 0=OPEN, 1=CLOSED, 2=15% OPEN, 3=UNKNOWN. Note that when OPEN (0) the integration time is 60 s for nighttime observations and when 15% OPEN (2) the integration time is 30 s for daytime observations.
Cadence
PT30S
Units
' '
ValidMin
0
ValidMax
3
FillValue
-9999999848243207295109594873856
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #37
Name
MIGHTI-B Aperture Position 2
ParameterKey
ICON_L23_MIGHTI_Aperture_2_Position
Description
Aperture Position 2: 0=OPEN, 1=CLOSED, 2=15% OPEN, 3=UNKNOWN. Note that when OPEN (0) the integration time is 60 s for nighttime observations and when 15% OPEN (2) the integration time is 30 s for daytime observations.
Cadence
PT30S
Units
' '
ValidMin
0
ValidMax
3
FillValue
-9999999848243207295109594873856
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #38
Name
Altitude of the ICON Spacecraft
ParameterKey
ICON_L23_Observatory_Altitude
Description
Spacecraft altitude at middle of exposure.
Cadence
PT30S
Units
km
ValidMin
0
ValidMax
9999999848243207295109594873856
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #39
Name
Latitude of the ICON Spacecraft
ParameterKey
ICON_L23_Observatory_Latitude
Description
Spacecraft latitude at middle of exposure.
Cadence
PT30S
Units
deg
ValidMin
-90
ValidMax
90
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #40
Name
Local Solar Time of the ICON Spacecraft
ParameterKey
ICON_L23_Observatory_Local_Solar_Time
Description
Spacecraft local solar time (0-24) at middle of exposure.
Cadence
PT30S
Units
deg
ValidMin
0
ValidMax
24
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #41
Name
Longitude of the ICON Spacecraft
ParameterKey
ICON_L23_Observatory_Longitude
Description
Spacecraft longitude (0-360) at middle of exposure.
Cadence
PT30S
Units
deg
ValidMin
0
ValidMax
360
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #42
Name
Solar Zenith Angle of the ICON Spacecraft
ParameterKey
ICON_L23_Observatory_Solar_Zenith_Angle
Description
Spacecraft solar zenith angle at middle of exposure.
Cadence
PT30S
Units
deg
ValidMin
-180
ValidMax
180
FillValue
-9999999848243207295109594873856
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #43
Name
Orbit Node Flag
ParameterKey
ICON_L23_Orbit_Node
Description
Flag indicating that the spacecraft is ascending (0) or descending (1) node.
Cadence
PT30S
ValidMin
0
ValidMax
1
FillValue
-127
Support
Qualifier
Scalar
SupportQuantity
Orientation
Parameter #44
Name
Orbit Number
ParameterKey
ICON_L23_Orbit_Number
Description
Orbit Number
Cadence
PT30S
ValidMin
0
ValidMax
105000
FillValue
-999
Support
Qualifier
Scalar
SupportQuantity
Temporal