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ICON Ion Velocity Meter (IVM) A In Situ Ions Data

Heelis, R. A. (2026). ICON Ion Velocity Meter (IVM) A In Situ Ions Data [Data set]. Space Physics Data Facility. https://doi.org/10.48322/5zxj-y481 .

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/ICON/IVM/L3/In-Situ-Ions/P10D

Description

ICON In Situ Ions; 48-day windows of data from the L2.7 v08 product are collected into longitude, latitude, and local time bins. Mean and standard deviations of each parameter are reported in this file. The IVM consists of two planar thermal ion sensors, a retarding potential analyzer (RPA) and an ion drift meter (IDM).

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Details

Version:2.7.2

MetadataRightsList

Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
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:2.7.2

NumericalData

ResourceID
spase://NASA/NumericalData/ICON/IVM/L3/In-Situ-Ions/P10D
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
ICON Ion Velocity Meter (IVM) A In Situ Ions Data
AlternateName
IVM A In Situ Ions Data
DOI
https://doi.org/10.48322/5zxj-y481
ReleaseDate
2026-09-04 19:16:51Z
RevisionHistory
RevisionEvent
ReleaseDate
2026-08-04 13:29:31Z
Note
First release
RevisionEvent
ReleaseDate
2026-09-04 19:16:51Z
Note
Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Added DOI. TLK
Description

ICON In Situ Ions; 48-day windows of data from the L2.7 v08 product are collected into longitude, latitude, and local time bins. Mean and standard deviations of each parameter are reported in this file. The IVM consists of two planar thermal ion sensors, a retarding potential analyzer (RPA) and an ion drift meter (IDM).

Acknowledgement
National Aeronautics and Space Administration; Dr. Roderick A. Heelis; Dr. Thomas Immel
PublicationInfo
Authors
Heelis, R. A.
PublicationDate
2026-06-16 00:00:00
PublishedBy
Space Physics Data Facility
Funding
Agency
National Aeronautics and Space Administration
Project
Explorers Program
AwardNumber
NNG12FA44C
Funding
Agency
National Aeronautics and Space Administration
Project
Explorers Program
AwardNumber
contracts NNG12FA42I
Contacts
Role Person StartDate StopDate Note
1. PrincipalInvestigator spase://SMWG/Person/Roderick.A.Heelis
InformationURL
Name
Additional information on ICON
URL
https://icon.ssl.berkeley.edu/
Description

ICON spacecraft Homepage.

InformationURL
Name
Ion Velocity Measurements for the Ionospheric Connections Explorer
URL
https://doi.org/10.1007/s11214-017-0383-3
Description

Space Science Reviews, 212(1-2), pp.615-629. DOI: 10.1007/s11214-017-0383-3

PriorIDs
spase://NASA/NumericalData/ICON/IVM/L2/PT1S
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
AccessRights
Open
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
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 NASA Heliophysics data products
AccessURL
Name
CDAWeb HAPI Server
URL
https://cdaweb.gsfc.nasa.gov/hapi
Style
HAPI
ProductKey
ICON_L3-3_In-Situ-Ions
Description

Web Service to this product using the HAPI interface.

Format
NetCDF
Acknowledgement
National Aeronautics and Space Administration; Dr. Roderick A. Heelis; Dr. Thomas Immel.
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
AccessRights
Open
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
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 NASA Heliophysics data products
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/icon/l2/l2-7_ivm-a/
ProductKey
ICON_L3-3_In-Situ-Ions
Description

Access to Data in NetCDF Format via https from SPDF

AccessURL
Name
CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=ICON_L3-3_In-Situ-Ions&index=sp_phys
ProductKey
ICON_L3-3_In-Situ-Ions
Description

Access to ASCII, NetCDF, CDF, and Plots via NASA/GSFC CDAWeb

Format
NetCDF
Encoding
None
Acknowledgement
National Aeronautics and Space Administration; Dr. Roderick A. Heelis; Dr. Thomas Immel.
ProcessingLevel
Calibrated
ProviderName
ICON Ion Velocity Meter team
InstrumentIDs
spase://SMWG/Instrument/ICON/IVM
MeasurementType
Dopplergram
TemporalDescription
TimeSpan
StartDate
2019-12-11 11:17:54Z
StopDate
2022-11-05 11:25:37Z
Cadence
P10D
ObservedRegion
Earth.NearSurface.Atmosphere
ObservedRegion
Earth.NearSurface.Ionosphere
Parameter #1
Name
Epoch time
ParameterKey
Epoch
Description

Time corresponding to the middle of each 48 day average, in milliseconds since Jan 1 1970.

Cadence
P10D
Units
ms
FillValue
-999
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #2
Name
48 day bins RPA
ParameterKey
ICON_L33_Included_Dates_RPA
Description

Dates used in each 48 day bin, in string format, in the format: 2017-05-27; data measured by the Retarding Potential Analyzer; from RPA flag used in all data products.

Cadence
P10D
FillValue
-999
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #3
Name
48 day bins DM
ParameterKey
ICON_L33_Included_Dates_DM
Description

Dates used in each 48 day bin, in string format, in the format: 2017-05-27; data measured by the Drift Meter; from DM flag used only in drifts (not in ion temperature, ion density, ion density O.

Cadence
P10D
FillValue
-999
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #4
Name
Ion Density
ParameterKey
ICON_L33_ION_DENSITY
Description

Mean value of ion density, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ICON_L27_ION_DENSITY.

Cadence
P10D
Units
N/cc
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
NumberDensity
AtomicNumber
1
Parameter #5
Name
Ion Temperature
ParameterKey
ICON_L33_ION_TEMPERATURE
Description

Mean value of ion temperature, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ICON_L27_ION_TEMPERATURE.

Cadence
P10D
Units
K
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #6
Name
Fraction of Total Plasma Number Density that is O+
ParameterKey
ICON_L33_FRACTIONAL_ION_DENSITY_O
Description

Mean value of fraction of total plasma number density that is O+ taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from FRACTIONAL_ION_DENSITY_O.

Cadence
P10D
Units
dimensionless
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
NumberDensity
AtomicNumber
8
Parameter #7
Name
Binned Field-Aligned Ion Velocity
ParameterKey
ICON_L33_ION_VELOCITY_FIELD_ALIGNED
Description

Mean value of field-aligned ion velocity, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_FIELD_ALIGNED.

Cadence
P10D
Units
m/s
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Vector
ParticleQuantity
Velocity
Parameter #8
Name
Binned Meridional Ion Velocity
ParameterKey
ICON_L33_ION_VELOCITY_MERIDIONAL
Description

Mean value of meridional ion velocity, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time.
Derived from ION_VELOCITY_MERIDIONAL. Meridional ion velocity is the ion velocity along local magnetic meridional direction, perpendicular to geomagnetic field and within local magnetic
meridional plane. The local meridional vector maps to vertical at the magnetic equator, positive is up.

Cadence
P10D
Units
m/s
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Vector
ParticleQuantity
Velocity
Parameter #9
Name
Binned Zonal Ion Velocity
ParameterKey
ICON_L33_ION_VELOCITY_ZONAL
Description

Mean value of zonal ion velocity, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_ZONAL.

Cadence
P10D
Units
m/s
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Vector
ParticleQuantity
FlowSpeed
Parameter #10
Name
Binned IVM Measured Ion Drifts along East
ParameterKey
ICON_L33_ION_VELOCITY_EAST
Description

Mean value of IVM measured ion drifts along East direction, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_EAST.

Cadence
P10D
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Vector
ParticleQuantity
FlowSpeed
Parameter #11
Name
Binned IVM Measured Ion Drifts along North
ParameterKey
ICON_L33_ION_VELOCITY_NORTH
Description

Mean value of IVM measured ion drifts along North direction, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_NORTH.

Cadence
P10D
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Vector
ParticleQuantity
FlowSpeed
Parameter #12
Name
Binned IVM measured ion drifts along Up
ParameterKey
ICON_L33_ION_VELOCITY_UP
Description

Mean value of IVM measured ion drifts along up direction, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_UP.

Cadence
P10D
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Vector
ParticleQuantity
FlowSpeed
Parameter #13
Name
Number of Data Points in the RPA measured data
ParameterKey
ICON_L33_datapoints_RPA
Description

Number of data points in each 48 day average data, measured by the Retarding Potential Analyzer (RPA), as a function of longitude, latitude, time.

Cadence
P10D
Units
counts
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
0
Support
Qualifier
Magnitude
SupportQuantity
Other
Parameter #14
Name
Number of Data Points in the DM measured data
ParameterKey
ICON_L33_datapoints_DM
Description

Number of data points in each 48 day average data, measured by the Drift Meter (DM) as a function of longitude, latitude, time.

Cadence
P10D
Units
counts
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
0
Support
Qualifier
Magnitude
SupportQuantity
Other
Parameter #15
Name
Sigma Ion Density
ParameterKey
ICON_L33_Sigma_ION_DENSITY
Description

1 standard deviation of the good ion density values used to compute the mean, as a function of longitude, latitude, time.

Cadence
P10D
Units
N/cc
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
StandardDeviation
ParticleQuantity
NumberDensity
AtomicNumber
1
Parameter #16
Name
Sigma Ion Temperature
ParameterKey
ICON_L33_Sigma_ION_TEMPERATURE
Description

1 standard deviation of the good fraction of ion temperature values used to compute the mean, as a function of longitude, latitude, time.

Cadence
P10D
Units
K
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
StandardDeviation
ParticleQuantity
Temperature
Parameter #17
Name
Sigma Fraction of Total Plasma Number Density that is O+
ParameterKey
ICON_L33_Sigma_FRACTIONAL_ION_DENSITY_O
Description

1 standard deviation of the good fraction of total plasma number density that is O+ values used to compute the mean, as a function of longitude, latitude, time.

Cadence
P10D
Units
dimensionless
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
StandardDeviation
ParticleQuantity
NumberDensity
AtomicNumber
8
Parameter #18
Name
Sigma Field-Aligned Ion Velocity
ParameterKey
ICON_L33_Sigma_ION_VELOCITY_FIELD_ALIGNED
Description

1 standard deviation of the good ion field aligned ion velocity values used to compute the mean, as a function of longitude, latitude, time.

Cadence
P10D
Units
m/s
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
StandardDeviation
ParticleQuantity
Velocity
Parameter #19
Name
Sigma Meridional Ion Velocity
ParameterKey
ICON_L33_Sigma_ION_VELOCITY_MERIDIONAL
Description

1 standard deviation of the good ion meridional ion velocity values used to compute the mean, as a function of longitude, latitude, time.

Cadence
P10D
Units
m/s
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
StandardDeviation
ParticleQuantity
Velocity
Parameter #20
Name
Sigma Zonal Ion Velocity
ParameterKey
ICON_L33_Sigma_ION_VELOCITY_ZONAL
Description

Mean value of zonal ion velocity, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_ZONAL.

Cadence
P10D
Units
m/s
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
StandardDeviation
ParticleQuantity
FlowSpeed
Parameter #21
Name
Sigma of Ion Drifts along East direction
ParameterKey
ICON_L33_Sigma_ION_VELOCITY_EAST
Description

1 standard deviation of the good ion drifts along East direction values used to compute the mean, as a function of longitude, latitude, time.

Cadence
P10D
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
StandardDeviation
ParticleQuantity
FlowSpeed
Parameter #22
Name
Sigma of ion drifts along North direction
ParameterKey
ICON_L33_Sigma_ION_VELOCITY_NORTH
Description

1 standard deviation of the good ion drifts along North direction values used to compute the mean, as a function of longitude, latitude, time.

Cadence
P10D
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
StandardDeviation
ParticleQuantity
FlowSpeed
Parameter #23
Name
Sigma of ion drifts along Up direction
ParameterKey
ICON_L33_Sigma_ION_VELOCITY_UP
Description

1 standard deviation of the good ion drifts along Up direction values used to compute the mean, as a function of longitude, latitude, time.

Cadence
P10D
ValidMin
-1.000000020040877e+20
ValidMax
1.000000020040877e+20
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
StandardDeviation
ParticleQuantity
FlowSpeed
Parameter #24
Name
Local Time Bin
ParameterKey
ICON_L33_LocalTime
Description

Local time binned in 0.5 hour intervals, local time +/- 0.25 hours.

Cadence
P10D
Units
hours
ValidMin
6
ValidMax
18
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #25
Name
Latitude Bin
ParameterKey
ICON_L33_Latitude
Description

Latitude of the IVM data, binned in 5 degree intervals, latitude +/- 2.5 degrees. Derived from ICON_IVM-A_L27_Latitude.

Cadence
P10D
Units
degrees
ValidMin
-20
ValidMax
35
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #26
Name
Longitude Bin
ParameterKey
ICON_L33_Longitude
Description

Longitude of the O/N2 data, binned in 15 degree intervals, longitude +/- 7.5 degrees. Derived from ICON_L24_Disk_Longitude.

Cadence
P10D
Units
degrees
ValidMin
0
ValidMax
360
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional