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Data Access
CDF
Polar Electric Fields Instrument (EFI), Spacecraft Potential and Plasma Density, Burst Resolution
var authors='Mozer, Forrest S.';
document.write(authors);
(2025).
Polar Electric Fields Instrument (EFI), Spacecraft Potential and Plasma Density, Burst Resolution.
[Data set].
University of California, Berkeley.
https://doi.org/10.48322/52h4-gz91. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/POLAR/EFI/SC/Potential_PlasmaDensity/Burst/PT6S
Description
This data consists of the Spacecraft Potential and the Plasma Density, at spacecraft burst resolution, where the Plasma Density is obtained as a function, provided by Dr. Jack Scudder, the PI of the POLAR Hydra investigation. This function was determined by a fit to the POLAR Hydra particle data for 2001/04/01. The relative accuracy of the Plasma Density, estimated from the spacecraft potential on short time scales is ~10-30% depending on plasma conditions. The absolute accuracy is better than a factor of two for densities less than about 20 particles/cm^3. Density values greater than 30 particles/cm^3 are not plotted because they are inaccurate due to the steep slope of the curve of density versus spacecraft potential. If the value of the argument to the function is too large, then the Plasma Density is set to a filler value of 1.0e+20. Also, if the value returned by the function is too large, then the result is not reliable, and therefore the Plasma Density is set to a filler value of 1.0e+20. If the value of the argument to the function is too small, then the Plasma Density is set to a filler value of 1.0e-20. So, a value of the Plasma Density is a filler value if and only if it is either larger than 1.0e+2 (100.0) or smaller than 1.0e-4 (0.0001); otherwise, it is a true value. Note that all values of the Spacecraft Potential are true values. There is no filler.
Metadata Rights
CC0-1.0:
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license.
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Details
Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/POLAR/EFI/SC/Potential_PlasmaDensity/Burst/PT6S
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
Polar Electric Fields Instrument (EFI), Spacecraft Potential and Plasma Density, Burst Resolution
DOI
https://doi.org/10.48322/52h4-gz91
ReleaseDate
2026-07-21 12:06:35Z
RevisionHistory
RevisionEvent
ReleaseDate
2020-07-07 21:15:01Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-08-05 13:12:20Z
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
2025-11-14 16:03:07Z
Note
Added PublicationInfo. Added ResourceType and NamingAuthority. ZCB
RevisionEvent
ReleaseDate
2025-12-04 13:31:00Z
Note
Added MetadataRightsList. Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-02-12 23:59:29Z
Note
Added DOI. tlk
RevisionEvent
ReleaseDate
2026-06-26 13:26:31Z
Note
Add 'Z' to TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB
RevisionEvent
ReleaseDate
2026-07-21 12:06:35Z
Note
Added HelioData InformationURL. JWL
Description
This data consists of the Spacecraft Potential and the Plasma Density, at spacecraft burst resolution, where the Plasma Density is obtained as a function, provided by Dr. Jack Scudder, the PI of the POLAR Hydra investigation. This function was determined by a fit to the POLAR Hydra particle data for 2001/04/01. The relative accuracy of the Plasma Density, estimated from the spacecraft potential on short time scales is ~10-30% depending on plasma conditions. The absolute accuracy is better than a factor of two for densities less than about 20 particles/cm^3. Density values greater than 30 particles/cm^3 are not plotted because they are inaccurate due to the steep slope of the curve of density versus spacecraft potential. If the value of the argument to the function is too large, then the Plasma Density is set to a filler value of 1.0e+20. Also, if the value returned by the function is too large, then the result is not reliable, and therefore the Plasma Density is set to a filler value of 1.0e+20. If the value of the argument to the function is too small, then the Plasma Density is set to a filler value of 1.0e-20. So, a value of the Plasma Density is a filler value if and only if it is either larger than 1.0e+2 (100.0) or smaller than 1.0e-4 (0.0001); otherwise, it is a true value. Note that all values of the Spacecraft Potential are true values. There is no filler.
Acknowledgement
The user will acknowledge, in any publication which uses POLAR EFI data, the instrument PI, as well as the instrument PI for the POLAR Hydra instrument, if the Plasma Density is used.
PublicationInfo
Authors
Mozer, Forrest S.
PublicationDate
2025-11-14 16:03:07Z
PublishedBy
University of California, Berkeley
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Forrest.S.Mozer
2.
MetadataContact
spase://SMWG/Person/Jack.B.Vernetti
InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/POLAR_EFI_SC_Potential_PlasmaDensity_Burst_PT6S
Description
The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.
PriorIDs
spase://VWO/NumericalData/POLAR/EFI/SC_Potential_PlasmaDensity_Burst
spase://VSPO/NumericalData/POLAR/EFI/SC/Potential_PlasmaDensity/Burst/PT6S
AccessInformation
RepositoryID
spase://SMWG/Repository/UCB/POLAR/EFI
Availability
Online
AccessRights
Open
AccessURL
URL
http://polarefi.ssl.berkeley.edu/PolarEFI
Description
This URL is the root location of the POLAR EFI archive. It consists of Yearly subdirectories: 1996, 1997, ..., 2008 each of which consists of Monthly subdirectories: 01, 02, ..., 12 The archive files for a given date are located in the corresponding YY/MM subdirectory.
Language
en
Format
CDF
Encoding
None
Acknowledgement
The user will acknowledge, in any publication which uses POLAR EFI data, the instrument PI, as well as the instrument PI for the POLAR Hydra instrument, if the Plasma Density is used.
InstrumentIDs
spase://SMWG/Instrument/POLAR/EFI
MeasurementType
ElectricField
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
1996-03-16 00:00:00Z
StopDate
2008-04-12 24:00:00Z
Cadence
PT6S
ObservedRegion
Earth.Magnetosphere.Polar
ObservedRegion
Earth.NearSurface.AuroralRegion
ObservedRegion
Earth.Magnetosphere
Parameter #1
Name
Time
ParameterKey
TIME_TAG
Description
Data point time-tags which are double precision floating point numbers which represent the number of seconds, UTC, from midnight of the day represented by the file.
Cadence
PT6S
Units
seconds
ValidMin
0.0
ValidMax
86460.0
Support
SupportQuantity
Temporal
Parameter #2
Name
SCPotential
ParameterKey
DATA_VALUES
Description
Data point value which represents the Spacecraft Potential as single precision floating point numbers. The SCPotential values are in in one-to-one correspondence with the values in the TIME_TAG parameter.
Cadence
PT6S
Units
Volts
ValidMin
-80.0
ValidMax
10.0
Field
Qualifier
Scalar
FieldQuantity
Potential
Parameter #3
Name
PlasmaDensity
ParameterKey
DATA_VALUES
Description
Data point value which represents the Plasma Density as single precision floating point numbers. Not all times in the TIME_TAG parameter correspond to true PlasmaDensity data, so there are filler values.
Cadence
PT6S
Units
Particles/cm^3
ValidMin
0.0001
ValidMax
100.0
FillValue
1.0e+20,1.0e-20
Field
Qualifier
Scalar
FieldQuantity
PlasmaFrequency