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Spherical Elementary Currents Systems (SECS) technique North American Equivalent Ionospheric Currents (EICs) derived at 10 sec Resolution in Geographic Coordinates

(2009). Spherical Elementary Currents Systems (SECS) technique North American Equivalent Ionospheric Currents (EICs) derived at 10 sec Resolution in Geographic Coordinates. [Data set]. University of California, Los Angeles. https://doi.org/10.21978/p8d62b. Accessed on .

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

ResourceID
spase://GBO/NumericalData/SECS/Magnetometer/EICS/PT10S

Description
The Equivalent Ionospheric Currents (EICs) data set contains horizontal ionospheric current data (Jx and Jy) derived using the SECS technique [Amm and Viljanen, Earth Planets Space, v. 51 pp. 431-440, 1999]. Positive Jx points to the geographic north pole. Positive Jy points to geographic east. The location of these currents is in geographic coordinates at 10s resolution. The distribution of these currents is not the same as the spherical elementary current amplitudes. The UT and date are obtained from the file name. For more information see Weygand et al. J. Geophys. Res. 116, A03305, doi:10.1029/2010JA016177, 2011.

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Version:2.7.0

NumericalData

ResourceID
spase://GBO/NumericalData/SECS/Magnetometer/EICS/PT10S
NamingAuthority
GBO
ResourceType
NumericalData
ResourceHeader
ResourceName
Spherical Elementary Currents Systems (SECS) technique North American Equivalent Ionospheric Currents (EICs) derived at 10 sec Resolution in Geographic Coordinates
AlternateName
North American EIC data
DOI
https://doi.org/10.21978/p8d62b
ReleaseDate
2025-11-24 11:14:45Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-05-31 12:34:56.789
Note
Updated to SPASE Version 2.3.2 if needed, Applied quality conntrol for DOI usage, LFB
RevisionEvent
ReleaseDate
2024-06-13 00:00:00.000
Note
Updated to SPASE Version 2.6.0. Heavily revised the metadata in almost everyway. JMW
RevisionEvent
ReleaseDate
2025-08-05 13:12:18Z
Note
Added ObservedRegion(s). 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 value in Version tag. ZCB
RevisionEvent
ReleaseDate
2025-11-24 11:14:45Z
Note
Fixed HTML character codes. Added ResourceType and NamingAuthority. ZCB
Description
The Equivalent Ionospheric Currents (EICs) data set contains horizontal ionospheric current data (Jx and Jy) derived using the SECS technique [Amm and Viljanen, Earth Planets Space, v. 51 pp. 431-440, 1999]. Positive Jx points to the geographic north pole. Positive Jy points to geographic east. The location of these currents is in geographic coordinates at 10s resolution. The distribution of these currents is not the same as the spherical elementary current amplitudes. The UT and date are obtained from the file name. For more information see Weygand et al. J. Geophys. Res. 116, A03305, doi:10.1029/2010JA016177, 2011.
Acknowledgement
Dr. O. Amm; Dr. J.M. Weygand; Prof. V. Angelopoulos, Athabasca University THEMIS UCLA Magnetometer Network (AUTUMN), Natural Resources Canada (NRCan), Canadian Array for Realtime Investigations of Magnetic Activity (CARISMA), Technical University of Denmark (DTU), Falcon, Geophysical Institute Magnetometer Array (GIMA), MagStar, Magnetometer Array for Cusp and Cleft Studies (MACCS), Mid‐continent MAgnetoseismic Chain (McMAC), Solar Terrestrial Energy Program (STEP), THEMIS, United States Geological Survey (USGS)
PublicationInfo
Authors
Weygand, James M.
PublicationDate
2009-01-01 00:00:00
PublishedBy
University of California, Los Angeles
Funding
Agency
NASA
Project
NASA Themis/Midex
AwardNumber
NAS5-02099
Funding
Agency
NASA
Project
The Dynamics of Earth’s Magnetosphere in the Presence of Flow Shear
AwardNumber
80NSSC18K0570
Funding
Agency
NASA
Project
Investigation of the Role of Force Balance in Magnetosphere-Ionosphere Coupling
AwardNumber
80NSSC18K1220
Funding
Agency
NASA
Project
Data Services Upgrade: Spherical Elementary Currents Systems Archive for Magnetosphere-Ionosphere Coupling over North America
AwardNumber
NNX14AJ77G
Funding
Agency
NASA
Project
Data Services Upgrade: Expansion of the Spherical Elementary Currents Systems Dataset for Magnetosphere-Ionosphere Coupling
AwardNumber
NNX16AD63G
Funding
Agency
NASA
Project
A Proposal for HPDE Community Data and Simulation Metadata and Standards Services
AwardNumber
80GSFC17C0018
Funding
Agency
NASA
Project
Quantifying the response of ionospheric currents to substorm-time and non-substorm fast flows
AwardNumber
80NSSC18K1227
Funding
Agency
NASA
Project
Enhancing Geomagnetically Induced Current Understanding and Prediction over Continental United States
AwardNumber
80NSSC20K1364
Funding
Agency
NSF-NERC
Project
Collaborative Research - Conjugate Experiment to Investigate the Sources of High-Latitude Magnetic Perturbations in the Coupled Solar Wind-Magnetosphere-Ionosphere-Ground System
AwardNumber
2027190
Funding
Agency
NASA
Project
Assessing Interplanetary Shock-Induced dB/dt Variations Controlled by Impact Angles
AwardNumber
80NSSC22K0756
Funding
Agency
NASA
Project
Extreme High-Latitude Geomagnetic Variations and their Drivers
AwardNumber
80NSSC24K0259
Contacts
Role Person StartDate StopDate Note
1. ProjectScientist spase://SMWG/Person/James.M.Weygand
2. Scientist spase://SMWG/Person/Olaf.Amm
3. MetadataContact spase://SMWG/Person/James.M.Weygand

InformationURL
Name
Journal of Earth, Planets, and Space article on the SECS technique
URL
https://doi.org/10.1029/2009JA014832
Description
Research Article on the SECS technique.
InformationURL
Name
Journal of Geophysical Research article on the SECS technique as Applied to North America
URL
https://doi.org/10.1029/2010JA016177
Description
Research Article on the SECS technique applied to North America and Greenland.
InformationURL
Name
SECS technique as Applied to North America
URL
https://sites.epss.ucla.edu/jweygand/eics_na_greenland-html-preview-equivalent-ionospheric-currents-over-north-america-and-greenland/
Description
Homepage with contact, "Rules of the Road," and acknowledgement information on the SECS technique applied to North America and Greenland.
PriorIDs
spase://VMO/NumericalData/SECS/Magnetometer/EICS/PT10S
AccessInformation
RepositoryID
spase://SMWG/Repository/SECS
Availability
Online
AccessRights
Open
AccessURL
Name
Virtual Magnetospheric Observatory
URL
http://vmo.igpp.ucla.edu/data1/SECS/
Description
Equivalent ionsheric current data produced over North America and Greenland
Format
Text
Acknowledgement
Dr. O. Amm; Dr. J.M. Weygand; Prof. V. Angelopoulos, AUTUMN, NRCan, CARISMA, DTU, Falcon, GIMA, MACCS, MagStar, McMAC, STEP, THEMIS, USGS
ProcessingLevel
Calibrated
ProviderResourceName
THEMIS
ProviderProcessingLevel
Numerical Data
InstrumentIDs
spase://SMWG/Instrument/SECS/Magnetometer
MeasurementType
MagneticField
TemporalDescription
TimeSpan
StartDate
2007-01-01 00:00:00
StopDate
2011-01-31 23:59:59
Note
Time format in data files is: day, month, year hour, min, seconds. Ex: '01-Jan-1981 00:00:00.000.' Data are not complete from 2007 to 2011. Availables months include: 2007/06, 2007/11-2008/03, 2008/10-2009/03, 2009/10-2010/01, and 2011/01
Cadence
PT10S
ObservedRegion
Earth.Surface
ObservedRegion
Earth.NearSurface.Ionosphere
Keywords
10 sec
ground magnetometer data
equivalent ionospheric currents
spherical elementary current systms
Parameter #1
Name
Geographic Location of Equivalent Ionospheric Current
ParameterKey
geo_loc
Description
These data are the geographic location in units of degrees of the derived equivalent ionospheric current at 10 s resolution. The Altitude of the current vector is 100 km above the surface of the Earth.
Caveats
The date and time are obtained from the file name.
Units
degrees
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GEO
Structure
Size
2
Description
Geographic Latitude and Longitude of the derived equivalent ionospheric current value.
Element
Name
Geographic Latitude
Qualifier
DirectionAngle.ElevationAngle
Index
1
Units
degrees
ValidMin
0
ValidMax
90
Element
Name
Geographic Longitude
Qualifier
DirectionAngle.AzimuthAngle
Index
2
Units
degrees
ValidMin
0
ValidMax
360
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #2
Name
Equivalent Ionospheric Currents (Jx and Jy)
ParameterKey
Jx_Jy
Description
These data are the Equivalent Ionospheric Currents (only the currents horizontal to the surface of the Earth: Jx and Jy) in units of mA/m at 10 s resolution. The Altitude of the current vector is 100 km above the surface of the Earth.
Caveats
The date and time are obtained from the file name. These are not the Hall currents, but a combination of the Hall and Pederson currents.
Units
mA/m
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GEO
Structure
Size
2
Description
Jx of the derived equivalent ionospheric current value. Positive Jx points to the geographic north pole. Positive Jy points to geographic east.
Element
Name
Jx
Qualifier
Component.I
Index
1
Units
mA/m
ValidMin
-1e8
ValidMax
1e8
Element
Name
Jy
Qualifier
Component.J
Index
2
Units
mA/m
ValidMin
-1e8
ValidMax
1e8
Support
Qualifier
Vector
SupportQuantity
Other
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Last Updated: 2025-11-24