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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
Polar Plasma Wave Instrument (PWI), Low Frequency Waveform Receiver, ~0.01 sec resolution fields
var authors='Gurnett, Donald, A.; Menietti, J., Douglas';
document.write(authors);
(2023).
Polar Plasma Wave Instrument (PWI), Low Frequency Waveform Receiver, ~0.01 sec resolution fields.
[Data set].
Space Physics Data Facility.
https://doi.org/10.48322/xbm6-4c53. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/POLAR/PWI/LFWR/PT0.01S
Description
The Low-Frequency Waveform Receiver (LFWR) is designed to provide an extension of the High Frequency Waveform Receiver into the frequency range below 25 Hz. The LFWR consists of six parallel low-pass filters connected to the three orthogonal electric field sensors and to the triaxial search coils. The input signals are band limited to a frequency range from 0.1 to 25 Hz and are sam- pled by a 12-bit analog-to-digital converter. The six LFWR channels are sampled simultaneously at a rate of 100 samples s-1. The dynamic range of the LFWRis approximately 72 dB with fixed gain. An FFT on 256 or 464 values, depending on the snapshot size, was used in calibrating the data; i.e., perform FFT, calibrate andin frequency domain, perform inverse FFT to get calibrated time series. Coordinate System Used: local magnetic field-aligned, a spacecraft centered coordinate system where Z is parallel to the local B-field determined from Polar MFE, X points outward and lies in the plane defined by the Z-axis and the radial vector from the earth to the spacecraft, and Y completes a right-handed system and points eastward. The X- and Z-axes are contained in the north-south plane. The three orthogonal magnetic field components are given in units of nT/Sec rather than nT because the response of the searchcoils across the passband is not flat. In order to obtain units of nT, the data would need to be digitally filtered to the frequency of interest and then integrated over time. Integrating over the entire passband could possibly destroy the resolution of the higher frequency components since the low frequency noise, if present, will dominate. Data are bandpass filtered. The valid range of data in the frequency domain is from 0.5 to 22.5 Hz. Reference:..Gurnett, D.A. et al, The Polar plasma wave instrument, Space Science Reviews, Vol. 71, pp. 597-622, 1995.
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/PWI/LFWR/PT0.01S
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
Polar Plasma Wave Instrument (PWI), Low Frequency Waveform Receiver, ~0.01 sec resolution fields
AlternateName
PO_H2_PWI
DOI
https://doi.org/10.48322/xbm6-4c53
ReleaseDate
2025-12-04 13:31:02Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 15:38:11
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2023-07-30 12:34:56.789
Note
Added DOI and PublicationInfo minted by LFB, metadata versioned up to SPASE 2.6.0, reviewed by LFB 20230727
RevisionEvent
ReleaseDate
2025-10-03 10:48:56Z
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 13:31:02Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
Description
The Low-Frequency Waveform Receiver (LFWR) is designed to provide an extension of the High Frequency Waveform Receiver into the frequency range below 25 Hz. The LFWR consists of six parallel low-pass filters connected to the three orthogonal electric field sensors and to the triaxial search coils. The input signals are band limited to a frequency range from 0.1 to 25 Hz and are sam- pled by a 12-bit analog-to-digital converter. The six LFWR channels are sampled simultaneously at a rate of 100 samples s-1. The dynamic range of the LFWRis approximately 72 dB with fixed gain. An FFT on 256 or 464 values, depending on the snapshot size, was used in calibrating the data; i.e., perform FFT, calibrate andin frequency domain, perform inverse FFT to get calibrated time series. Coordinate System Used: local magnetic field-aligned, a spacecraft centered coordinate system where Z is parallel to the local B-field determined from Polar MFE, X points outward and lies in the plane defined by the Z-axis and the radial vector from the earth to the spacecraft, and Y completes a right-handed system and points eastward. The X- and Z-axes are contained in the north-south plane. The three orthogonal magnetic field components are given in units of nT/Sec rather than nT because the response of the searchcoils across the passband is not flat. In order to obtain units of nT, the data would need to be digitally filtered to the frequency of interest and then integrated over time. Integrating over the entire passband could possibly destroy the resolution of the higher frequency components since the low frequency noise, if present, will dominate. Data are bandpass filtered. The valid range of data in the frequency domain is from 0.5 to 22.5 Hz. Reference:..Gurnett, D.A. et al, The Polar plasma wave instrument, Space Science Reviews, Vol. 71, pp. 597-622, 1995.
Acknowledgement
Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center and Polar PWI instrument Principal Investigator Don Gurnett of The University of Iowa.
PublicationInfo
Authors
Gurnett, Donald, A.; Menietti, J., Douglas
PublicationDate
2023-01-01 00:00:00
PublishedBy
Space Physics Data Facility
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Donald.A.Gurnett
2.
GeneralContact
spase://SMWG/Person/J.Douglas.Menietti
3.
MetadataContact
spase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
Polar Plasma Wave Investigation (PWI) Data and User's Guides
URL
http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/data.html
Description
A Polar PWI page is maintained at the University of Iowa with descriptions of interpretation issues, user's guides, data availability tables, a form for creating summary plots and access to pregenerated dynamic spectrograms.
Language
en
PriorIDs
spase://VWO/NumericalData/POLAR/PWI/Polar_PWI_LFWR_PT0.01S
spase://VWO/NumericalData/POLAR/PWI/LFWR.PT0.01S
spase://VSPO/NumericalData/POLAR/PWI/LFWR/PT0.01S
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/polar/pwi/pwi_h2/
Description
FTP access to repository of Polar PWI MCA CDFs at NASA CDAWeb. Name of the data resource: PO_H2_PWI
Language
en
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/polar/pwi/pwi_h2/
Description
In CDF via HTTP from SPDF
Format
CDF
Acknowledgement
Users please acknowledge Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center and Polar PWI instrument Principal Investigator Don Gurnett.
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
URL
https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=PO_H2_PWI&index=sp_phys
ProductKey
PO_H2_PWI
Description
Repository of Polar PWI data with subset, plot, and list functionalities from NASA CDAWeb, accessible via web interface. Name of the data resource: PO_H2_PWI.
Language
en
Format
Text
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/polar/pwi/pwi_h2/$Y
AccessFilenameTemplate
po_h2_pwi_$Y$m$d_$v.cdf
Acknowledgement
Users please acknowledge Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center and Polar PWI instrument Principal Investigator Don Gurnett.
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/PO_H2_PWI/clientLibraryExample/
Style
WebService
ProductKey
PO_H2_PWI
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
Users please acknowledge Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center and Polar PWI instrument Principal Investigator Don Gurnett.
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
PO_H2_PWI
Description
Web Service to this product using the HAPI interface.
Format
CSV
Acknowledgement
Users please acknowledge Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center and Polar PWI instrument Principal Investigator Don Gurnett.
InstrumentIDs
spase://SMWG/Instrument/POLAR/PWI
MeasurementType
Waves.Passive
MeasurementType
Spectrum
TemporalDescription
TimeSpan
StartDate
1996-03-25 00:00:16.000
StopDate
1997-09-16 16:52:55.000
Cadence
PT0.01S
SpectralRange
RadioFrequency
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.NearSurface.Plasmasphere
ObservedRegion
Earth.NearSurface.AuroralRegion
ObservedRegion
Earth.NearSurface.PolarCap
ObservedRegion
Heliosphere.Inner
Caveats
See the Polar Interpretation Issues web site at http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/interpretation.html
Keywords
Dynamic Spectrogram
Spectrogram
AKR
Auroral hiss
Auroral Kilometric Radiation
Banded emissions
Broadband Electrostatic Noise
BEN
Chorus
Continuum radiation
Electromagnetic Ion Cyclotron waves
EMIC
Electron Cyclotron Harmonics
Kilometric Continuum radiation
Myriametric radiation
Plasmaspheric Hiss
Solar radio burst
Terrestrial Kilometric Radiation
TKR
UHR
Upper hybrid resonance
Whistler mode
Whistlers
Parameter #1
Name
Time
ParameterKey
Epoch
Description
Time
Cadence
PT0.01S
Units
ms
RenderingHints
AxisLabel
Epoch
ValidMin
27-Feb-1996 00:00:00.000
ValidMax
31-Dec-2020 00:00:00.000
FillValue
-1.0e+31
Support
SupportQuantity
Temporal
Parameter #2
Name
Delta_T
ParameterKey
Delta_T
Description
Time, time between points
Cadence
PT0.01S
Units
s
FillValue
-1.0e+31
Support
SupportQuantity
Temporal
Parameter #3
Name
NUM_SNAP
ParameterKey
NUM_SNAP
Description
Number of snapshots in this file
Cadence
PT0.01S
ValidMin
0
ValidMax
4800
Support
SupportQuantity
Other
Parameter #4
Name
DATA_QUALITY
ParameterKey
DATA_QUALITY
Description
Data Quality 0 = OK, 1 = poor
Cadence
PT0.01S
Units
(0=OK,1=poor)
ValidMin
0
ValidMax
1
FillValue
-2147480064
Support
SupportQuantity
Other
Parameter #5
Name
LFWR Elec. Field Antenna Ex
ParameterKey
LFWR_Ex
Description
LFWR Elec. Field, Antenna Ex (perp and outward in Local-Field-Aligned/LFA coords)
Caveats
When FFT is applied, Filter Rolls off at 25 kHz
Cadence
PT0.01S
Units
mV/M
RenderingHints
AxisLabel
LFWR Ex-LFA
ValueFormat
E12.4
ValidMin
-400.0
ValidMax
400.0
FillValue
-1.0e+31
Wave
WaveType
PlasmaWaves
WaveQuantity
ACElectricField
FrequencyRange
SpectralRange
RadioFrequency
Low
0.1
High
25
Units
Hz
Parameter #6
Name
LFWR Elec. Field Antenna Ey
ParameterKey
LFWR_Ey
Description
LFWR Elec. Field, Antenna Ey (perp and eastward in Local-Field-Aligned/LFA coords)
Caveats
When FFT is applied, Filter Rolls off at 25 kHz
Cadence
PT0.01S
Units
mV/M
RenderingHints
AxisLabel
LFWR Ey-LFA
ValueFormat
E12.4
ValidMin
-400.0
ValidMax
400.0
FillValue
-1.0e+31
Wave
WaveType
PlasmaWaves
WaveQuantity
ACElectricField
FrequencyRange
SpectralRange
RadioFrequency
Low
0.1
High
25
Units
Hz
Parameter #7
Name
LFWR Elec. Field Antenna Ez
ParameterKey
LFWR_Ez
Description
LFWR Elec. Field, Antenna Ez (parallel in Local-Field-Aligned/LFA coords)
Caveats
When FFT is applied, Filter Rolls off at 25 kHz
Cadence
PT0.01S
Units
mV/M
RenderingHints
AxisLabel
LFWR Ez-LFA
ValueFormat
E12.4
ValidMin
-400.0
ValidMax
400.0
FillValue
-1.0e+31
Wave
WaveType
PlasmaWaves
WaveQuantity
ACElectricField
FrequencyRange
SpectralRange
RadioFrequency
Low
0.1
High
25
Units
Hz
Parameter #8
Name
LFWR Mag. Field Antenna Bx
ParameterKey
LFWR_Bx
Description
LFWR Mag. Field, Antenna Bx (perp and outward in Local-Field-Aligned/LFA coords)
Caveats
When FFT is applied, Filter Rolls off at 25 kHz
Cadence
PT0.01S
Units
nT/Sec
RenderingHints
AxisLabel
LFWR Bx-LFA
ValueFormat
E12.4
ValidMin
-400.0
ValidMax
400.0
FillValue
-1.0e+31
Wave
WaveType
PlasmaWaves
WaveQuantity
ACMagneticField
FrequencyRange
SpectralRange
RadioFrequency
Low
0.1
High
25
Units
Hz
Parameter #9
Name
LFWR Mag. Field Antenna By
ParameterKey
LFWR_By
Description
LFWR Mag. Field, Antenna By (perp and eastward in Local-Field-Aligned/LFA coords)
Caveats
When FFT is applied, Filter Rolls off at 25 kHz
Cadence
PT0.01S
Units
nT/Sec
RenderingHints
AxisLabel
LFWR By-LFA
ValueFormat
E12.4
ValidMin
-400.0
ValidMax
400.0
FillValue
-1.0e+31
Wave
WaveType
PlasmaWaves
WaveQuantity
ACMagneticField
FrequencyRange
SpectralRange
RadioFrequency
Low
0.1
High
25
Units
Hz
Parameter #10
Name
LFWR Mag. Field Antenna Bz
ParameterKey
LFWR_Bz
Description
LFWR Mag. Field, Antenna Bz (parallel in Local-Field-Aligned/LFA coords)
Caveats
When FFT is applied, Filter Rolls off at 25 kHz
Cadence
PT0.01S
Units
nT/Sec
RenderingHints
AxisLabel
LFWR Bz-LFA
ValueFormat
E12.4
ValidMin
-400.0
ValidMax
400.0
FillValue
-1.0e+31
Wave
WaveType
PlasmaWaves
WaveQuantity
ACMagneticField
FrequencyRange
SpectralRange
RadioFrequency
Low
0.1
High
25
Units
Hz
Parameter #11
Name
Time
ParameterKey
Epoch0
Description
Time, begin time of LFWR snapshot
Cadence
PT0.01S
Units
ms
RenderingHints
AxisLabel
Epoch
ValidMin
27-Feb-1996 00:00:00.000
ValidMax
31-Dec-2020 00:00:00.000
FillValue
-1.0e+31
Support
SupportQuantity
Temporal
Parameter #12
Name
FFT_size
ParameterKey
FFT_size
Description
Size of FFT used in Calibration of snapshot beginning at Epoch0
Cadence
PT0.01S
Support
SupportQuantity
Other