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Data Access
FTPS from SPDF (not with most browsers)
HTTPS from SPDF
CDAWeb
WebService:
CDAWeb Programmatic Data Access
HAPI: CDAWeb HAPI Server
DE 2 Vector Electric Field Instrument (VEFI) AC Electric Field Spectrometers, A, B, and C, all frequency channels, Spacecraft, SC, coordinates, PT0.5S Data
var authors='Maynard, Nelson, C.; Pfaff, Robert, F.';
document.write(authors);
(2023).
DE 2 Vector Electric Field Instrument (VEFI) AC Electric Field Spectrometers, A, B, and C, all frequency channels, Spacecraft, SC, coordinates, PT0.5S Data.
[Data set].
Space Physics Data Facility.
https://doi.org/10.48322/x1km-9q17. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/DE2/VEFI/AC/CDF/PT0.5S
Description
The Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, used flight-proven double-probe techniques with 20-m baselines to obtain measurements of DC electric fields. This electric field investigation had the following objectives:
* 1) Obtain accurate and comprehensive triaxial DC electric field measurements at ionospheric altitudes in order to refine the basic spatial patterns
* 2) Define the large-scale time history of these patterns
* 3) Study the small-scale temporal and spatial variations within the overall patterns
* 4) Study the degree to which and in what region the electric field projects to the equatorial plane
* 5) Obtain measurements of extreme low frequency, ELF, and lower frequency irregular structures
* 6) Perform numerous correlative studies
The VEFI instrument consisted of six cylindrical elements 11 m long and 28 mm in diameter. Each antenna was insulated from the plasma except for the outer 2 m. The baseline, or distance between the midpoints of these 2-m active elements, was 20 m. The antennas were interlocked along the edges to prevent oscillation and to increase their rigidity against drag forces. The antenna pair perpendicular to the orbit plane did not deploy. The basic electronic system was very similar in concept to those used on IMP-8 and ISEE 1, but modified for a three-axis measurement on a nonspinning spacecraft. At the core of the system were the high-impedance 1.0E12 ohm preamplifiers whose outputs were accurately subtracted and digitized at 14-bit analog to digital, A/D, conversion for sensitivity to about 0.1 µV/m to maintain high resolution, for subsequent removal of the cross-product of the spacecraft velocity, Vsc, and magnetic field, B, vectors in data processing. This provided the basic DC measurement. Other circuitry was used to aid in interpreting the DC data and to measure rapid variations in the signals detected by the antennas. The planned DC electric field range was i±1 V/m, the planned resolution was 0.1 mV/m, and the variational electric field was measured from 4 Hz to 1024 Hz. The DC electric field was measured at 16 samples/s. The variational electric field was measured from 1 µV/m to 10 mV/m root mean square, RMS. Additional details are found in N.C. Maynard et al., Space Sci. Instrum., 5(4), 523, 1981.
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Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/DE2/VEFI/AC/CDF/PT0.5S
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
DE 2 Vector Electric Field Instrument (VEFI) AC Electric Field Spectrometers, A, B, and C, all frequency channels, Spacecraft, SC, coordinates, PT0.5S Data
DOI
https://doi.org/10.48322/x1km-9q17
ReleaseDate
2026-07-21 12:04:51Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 15:38:11Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2023-07-30 12:34:56.789Z
Note
Added DOI and PublicationInfo minted by LFB, Metadata versioned up to SPASE 2.6.0, reviewed by LFB 20230727
RevisionEvent
ReleaseDate
2024-02-22 12:34:56.789Z
Note
Corrected TemporalDescription TimeSpan StartDate and StopDate information, Edited ResourceHeader Description to conform with SPASE text normalization and mark-up conventions, LFB 20240222
RevisionEvent
ReleaseDate
2025-10-02 15:11:49Z
Note
Updated PublishedBy name to match ROR Registry. 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 13:29:08Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
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ReleaseDate
2026-06-26 13:16:46Z
Note
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RevisionEvent
ReleaseDate
2026-07-21 12:04:51Z
Note
Added HelioData InformationURL. JWL
Description
The Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, used flight-proven double-probe techniques with 20-m baselines to obtain measurements of DC electric fields. This electric field investigation had the following objectives:
* 1) Obtain accurate and comprehensive triaxial DC electric field measurements at ionospheric altitudes in order to refine the basic spatial patterns
* 2) Define the large-scale time history of these patterns
* 3) Study the small-scale temporal and spatial variations within the overall patterns
* 4) Study the degree to which and in what region the electric field projects to the equatorial plane
* 5) Obtain measurements of extreme low frequency, ELF, and lower frequency irregular structures
* 6) Perform numerous correlative studies
The VEFI instrument consisted of six cylindrical elements 11 m long and 28 mm in diameter. Each antenna was insulated from the plasma except for the outer 2 m. The baseline, or distance between the midpoints of these 2-m active elements, was 20 m. The antennas were interlocked along the edges to prevent oscillation and to increase their rigidity against drag forces. The antenna pair perpendicular to the orbit plane did not deploy. The basic electronic system was very similar in concept to those used on IMP-8 and ISEE 1, but modified for a three-axis measurement on a nonspinning spacecraft. At the core of the system were the high-impedance 1.0E12 ohm preamplifiers whose outputs were accurately subtracted and digitized at 14-bit analog to digital, A/D, conversion for sensitivity to about 0.1 µV/m to maintain high resolution, for subsequent removal of the cross-product of the spacecraft velocity, Vsc, and magnetic field, B, vectors in data processing. This provided the basic DC measurement. Other circuitry was used to aid in interpreting the DC data and to measure rapid variations in the signals detected by the antennas. The planned DC electric field range was i±1 V/m, the planned resolution was 0.1 mV/m, and the variational electric field was measured from 4 Hz to 1024 Hz. The DC electric field was measured at 16 samples/s. The variational electric field was measured from 1 µV/m to 10 mV/m root mean square, RMS. Additional details are found in N.C. Maynard et al., Space Sci. Instrum., 5(4), 523, 1981.
Acknowledgement
Please acknowledge the Principal Investigator N.C. Maynard and R.F. Pfaff for use of the Data
PublicationInfo
Authors
Maynard, Nelson, C.; Pfaff, Robert, F.
PublicationDate
2023-01-01 00:00:00Z
PublishedBy
Space Physics Data Facility
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Nelson.C.Maynard
2.
PrincipalInvestigator
spase://SMWG/Person/Robert.F.Pfaff
3.
MetadataContact
spase://SMWG/Person/Robert.M.Candey
4.
MetadataContact
spase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, data readme text file, NASA GSFC
URL
https://spdf.gsfc.nasa.gov/pub/data/de/de2/electric_fields_vefi/00readme.txt
Description
Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, data readme text file, hosted by NASA GSFC
Language
en
InformationURL
Name
Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, instrument and data description, NASA GSFC
URL
https://spdf.gsfc.nasa.gov/pub/data/de/de2/electric_fields_vefi/VEFI_instrument_data.txt
Description
Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, instrument and data description, hosted by NASA GSFC
Language
en
InformationURL
Name
OMNIWeb FTP Browser access to Dynamics Explorer 2 Magnetic and Electric Field ASCII data, NASA GSFC
URL
https://omniweb.gsfc.nasa.gov/ftpbrowser/de2_mag.html
Description
OMNIWeb FTP Browser access to Dynamics Explorer 2 Magnetic and Electric Field ASCII data including plot, listing, and output file services, hosted by NASA GSFC
Language
en
InformationURL
Name
NSSDC Master Catalog, Dynamics Explorer 2, VEFI instrument
URL
https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1981-070B-02
Description
General information concerning the Dynamics Explorer 2, Vector Electric Field Instrument, VEFI, instrument
Language
en
InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/DE2_VEFI_AC_CDF_PT0.5S
Description
The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.
PriorIDs
spase://VSPO/NumericalData/DE2/VEFI/AC/CDF/PT0.5S
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
AccessRights
Open
RightsList
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 NASA Heliophysics data products
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/de/de2/electric_fields_vefi/ac500ms_vefi_cdaweb/
Description
Access to Data in CDF Format via ftp from SPDF
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/de/de2/electric_fields_vefi/ac500ms_vefi_cdaweb/
Description
Access to Data in CDF Format via http from SPDF
AccessURL
Name
CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=DE2_AC500MS_VEFI&index=sp_phys
ProductKey
DE2_AC500MS_VEFI
Description
Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb
Format
CDF
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/de/de2/electric_fields_vefi/ac500ms_vefi_cdaweb/$Y
AccessFilenameTemplate
de2_ac500ms_vefi_$Y$m$d_$v.cdf
Acknowledgement
Please acknowledge the Principal Investigator N.C. Maynard and R.F. Pfaff. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb Programmatic Data Access
URL
https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/DE2_AC500MS_VEFI/clientLibraryExample/
Style
WebService
ProductKey
DE2_AC500MS_VEFI
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
Please acknowledge the Principal Investigator N.C. Maynard and R.F. Pfaff. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
AccessRights
Open
RightsList
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 NASA Heliophysics data products
AccessURL
Name
CDAWeb HAPI Server
URL
https://cdaweb.gsfc.nasa.gov/hapi
Style
HAPI
ProductKey
DE2_AC500MS_VEFI
Description
Web Service to this product using the HAPI interface.
Format
CSV
Acknowledgement
Please acknowledge the Principal Investigator N.C. Maynard and R.F. Pfaff. Please acknowledge the Data Providers and CDAWeb when using these Data.
ProcessingLevel
Calibrated
InstrumentIDs
spase://SMWG/Instrument/DynamicsExplorer2/VEFI
MeasurementType
ElectricField
MeasurementType
Ephemeris
MeasurementType
InstrumentStatus
TemporalDescription
TimeSpan
StartDate
1981-08-10 00:00:00.000Z
StopDate
1983-02-16 23:59:59.999Z
Cadence
PT0.5S
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.Magnetosphere.Polar
ObservedRegion
Earth.NearSurface
ObservedRegion
Earth.NearSurface.AuroralRegion
ObservedRegion
Earth.NearSurface.EquatorialRegion
ObservedRegion
Earth.NearSurface.Ionosphere
ObservedRegion
Earth.NearSurface.PolarCap
Parameter #1
Name
Epoch Time
ParameterKey
Epoch
Description
Epoch Time Tags, time elapsed since 0 A.D., NSSDC standard-reference time value
Caveats
Average Type: standard This Parameter exhibits an increasing Monotonic Progression.
Cadence
PT0.5S
Units
ms
UnitsConversion
1.0e-3>s
RenderingHints
DisplayType
TimeSeries
ValueFormat
F14.0
ScaleMin
6.2536662219904e+13
ScaleMax
6.2834069019904e+13
ValidMin
15-Sep-1981 00:00:00.000
ValidMax
18-Feb-1991 23:59:59.999
FillValue
31-Dec-9999 23:59:59.999
Support
SupportQuantity
Temporal
Parameter #2
Name
Orbit Number
Set
Time series defined by using: EPOCH
ParameterKey
orbitNumber
Description
Orbit Number
Cadence
PT0.5S
RenderingHints
DisplayType
TimeSeries
AxisLabel
orbit number
ValueFormat
I4
ValidMin
1
ValidMax
8577
FillValue
999
Support
SupportQuantity
Other
Parameter #3
Name
Spectrometer A, AC Electric Field
Set
Time series defined by using: EPOCH
ParameterKey
spectA
Description
Spectrometer A, AC Electric Field, eight frequencies
Cadence
PT0.5S
Units
µV/m
UnitsConversion
1.0e-6>V/m
RenderingHints
AxisLabel
AC Spect A
ValueFormat
F7.2
ScaleType
LogScale
Structure
Size
8
Element
Name
Element 1
Index
1
RenderingHints
AxisLabel
1
Element
Name
Element 2
Index
2
RenderingHints
AxisLabel
2
Element
Name
Element 3
Index
3
RenderingHints
AxisLabel
3
Element
Name
Element 4
Index
4
RenderingHints
AxisLabel
4
Element
Name
Element 5
Index
5
RenderingHints
AxisLabel
5
Element
Name
Element 6
Index
6
RenderingHints
AxisLabel
6
Element
Name
Element 7
Index
7
RenderingHints
AxisLabel
7
Element
Name
Element 8
Index
8
RenderingHints
AxisLabel
8
ValidMin
0.0
ValidMax
9999.98
FillValue
9999.99
Field
Qualifier
Array
FieldQuantity
Electric
Parameter #4
Name
Spectrometer B, AC Electric Field
Set
Time series defined by using: EPOCH
ParameterKey
spectB
Description
Spectrometer B, AC Electric Field, eight frequencies
Cadence
PT0.5S
Units
µV/m
UnitsConversion
1.0e-6>V/m
RenderingHints
AxisLabel
AC Spect B
ValueFormat
F7.2
ScaleType
LogScale
Structure
Size
8
Element
Name
Element 1
Index
1
RenderingHints
AxisLabel
1
Element
Name
Element 2
Index
2
RenderingHints
AxisLabel
2
Element
Name
Element 3
Index
3
RenderingHints
AxisLabel
3
Element
Name
Element 4
Index
4
RenderingHints
AxisLabel
4
Element
Name
Element 5
Index
5
RenderingHints
AxisLabel
5
Element
Name
Element 6
Index
6
RenderingHints
AxisLabel
6
Element
Name
Element 7
Index
7
RenderingHints
AxisLabel
7
Element
Name
Element 8
Index
8
RenderingHints
AxisLabel
8
ValidMin
0.0
ValidMax
9999.98
FillValue
9999.99
Field
Qualifier
Array
FieldQuantity
Electric
Parameter #5
Name
Spectrometer C, AC Electric Field
Set
Time series defined by using: EPOCH
ParameterKey
spectC
Description
Spectrometer C, AC Electric Field, four frequencies
Cadence
PT0.5S
Units
µV/m
UnitsConversion
1.0e-6>V/m
RenderingHints
AxisLabel
AC Spect C
ValueFormat
F7.2
ScaleType
LogScale
Structure
Size
4
Element
Name
Element 1
Index
1
RenderingHints
AxisLabel
1
Element
Name
Element 2
Index
2
RenderingHints
AxisLabel
2
Element
Name
Element 3
Index
3
RenderingHints
AxisLabel
3
Element
Name
Element 4
Index
4
RenderingHints
AxisLabel
4
ValidMin
0.0
ValidMax
9999.98
FillValue
9999.99
Field
Qualifier
Array
FieldQuantity
Electric
Parameter #6
Name
Spectrometer A Connection Flag
Set
Time series defined by using: EPOCH
ParameterKey
spectAconnection
Description
Spectrometer A Connection Flag (X,Y,Z)
Cadence
PT0.5S
RenderingHints
DisplayType
TimeSeries
AxisLabel
spect A connect
ValueFormat
A1
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #7
Name
Spectrometer B Connection Flag
Set
Time series defined by using: EPOCH
ParameterKey
spectBconnection
Description
Spectrometer B Connection Flag (X,Y,Z)
Cadence
PT0.5S
RenderingHints
DisplayType
TimeSeries
AxisLabel
spect B connect
ValueFormat
A1
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #8
Name
Spectrometer C Connection Flag
Set
Time series defined by using: EPOCH
ParameterKey
spectCconnection
Description
Spectrometer C Connection Flag (X,Y,Z)
Cadence
PT0.5S
RenderingHints
DisplayType
TimeSeries
AxisLabel
spect C connect
ValueFormat
A1
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #9
Name
Spectrometer A Gain
Set
Time series defined by using: EPOCH
ParameterKey
spectAgain
Description
Spectrometer A Gain (H,L)
Cadence
PT0.5S
RenderingHints
DisplayType
TimeSeries
AxisLabel
spect A gain
ValueFormat
A1
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #10
Name
Spectrometer B Gain
Set
Time series defined by using: EPOCH
ParameterKey
spectBgain
Description
Spectrometer B Gain (H,L)
Cadence
PT0.5S
RenderingHints
DisplayType
TimeSeries
AxisLabel
spect B gain
ValueFormat
A1
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #11
Name
Spectrometer C Gain
Set
Time series defined by using: EPOCH
ParameterKey
spectCgain
Description
Spectrometer C Gain (H,L)
Cadence
PT0.5S
RenderingHints
DisplayType
TimeSeries
AxisLabel
spect C gain
ValueFormat
A1
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #12
Name
Spacecraft Position, Latitude, Geographic spherical coordinates
Set
Time series defined by using: EPOCH
ParameterKey
glat
Description
Spacecraft Position, Latitude, Geographic, GEO, spherical coordinates
Cadence
PT0.5S
Units
°
UnitsConversion
0.0174532925>rad
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GEO
RenderingHints
DisplayType
TimeSeries
AxisLabel
Geog Latitude
ValueFormat
F7.2
ValidMin
-90.0
ValidMax
90.0
FillValue
9999.99
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #13
Name
Spacecraft Position, Longitude, Geographic spherical coordinates
Set
Time series defined by using: EPOCH
ParameterKey
glon
Description
Spacecraft Position, Longitude, Geographic, GEO, spherical coordinates
Cadence
PT0.5S
Units
°
UnitsConversion
0.0174532925>rad
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GEO
RenderingHints
DisplayType
TimeSeries
AxisLabel
Geog Longitude
ValueFormat
F7.2
ValidMin
-180.0
ValidMax
180.0
FillValue
9999.99
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #14
Name
Spacecraft Position, Invariant Latitude
Set
Time series defined by using: EPOCH
ParameterKey
ilat
Description
Spacecraft Position, Invariant Latitude
Cadence
PT0.5S
Units
°
UnitsConversion
0.0174532925>rad
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
MAG
RenderingHints
DisplayType
TimeSeries
AxisLabel
Inv Lat
ValueFormat
F7.2
ValidMin
-90.0
ValidMax
90.0
FillValue
9999.99
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #15
Name
Spacecraft Position, Magnetic Local Time
Set
Time series defined by using: EPOCH
ParameterKey
mlt
Description
Spacecraft Position, Magnetic Local Time, MLT
Cadence
PT0.5S
Units
h
UnitsConversion
3600>s
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
MAG
RenderingHints
DisplayType
TimeSeries
AxisLabel
MLT
ValueFormat
F7.2
ValidMin
0.0
ValidMax
24.0
FillValue
9999.99
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #16
Name
Spacecraft Position, Altitude
Set
Time series defined by using: EPOCH
ParameterKey
alt
Description
Spacecraft Position, Altitude
Cadence
PT0.5S
Units
km
UnitsConversion
1.0e3>m
RenderingHints
DisplayType
TimeSeries
AxisLabel
Altitude
ValueFormat
F7.2
ValidMin
0.0
ValidMax
10000.0
FillValue
9999.99
Support
Qualifier
Magnitude
Qualifier
Scalar
SupportQuantity
Positional
Parameter #17
Name
Indices for Spectrometer A and Spectrometer B Energy Channels
ParameterKey
index8
Description
Indices for Spectrometer A and Spectrometer B Energy Channels
Cadence
PT0.5S
RenderingHints
AxisLabel
channel
Structure
Size
8
ValidMin
1
ValidMax
4
Support
SupportQuantity
Other
Parameter #18
Name
Indices for Spectrometer C Energy Channels
ParameterKey
index4
Description
Indices for Spectrometer C Energy Channels
Cadence
PT0.5S
RenderingHints
AxisLabel
channel
Structure
Size
4
ValidMin
1
ValidMax
4
Support
SupportQuantity
Other