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Data Access
PWI Multichannel Analyzer Survey and Eclipse Data
POLAR Plasma Wave Investigation (PWI) Multichannel Analyzer (MCA) Survey Spectrograms
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(2025).
POLAR Plasma Wave Investigation (PWI) Multichannel Analyzer (MCA) Survey Spectrograms.
[Data set].
University of Iowa.
https://doi.org/10.48322/anwe-2q24. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/DisplayData/POLAR/PWI/MCA/DS/P1D
Description
The Polar PWI Multichannel Analyzer (MCA) collected data from March 1996 to September 1997. The MCA data has very good time resolution (~1 s) but relatively poor frequency resolution. An electric field measurement covers 5.6 Hz to 311 kHz in 20 channels logarithmically spaced. The magnetic field measurements cover a range from 5.6 Hz to 10 kHz in 14 channels logarithmically spaced. Each file consists of two plots. Each plot contains the power spectral density (color scale) of received signal (upper plot: electric (V^2 m^-2 Hz^-1), lower plot: magnetic (nT^2 Hz^-1) ) as a function of operating frequency (in a logarithmic scale on vertical axis) and time (horizontal axis). At the top of each plot is a title indicating the Instrument, Receiver and Antenna used along with the time span for the spectrogram. Overlaid on each image is a trace of the electron gyrofrequency. Beneath the time labels on the horizontal axis of the lower plot are ephemeris data: position of the spacecraft in radial distance (Earth radii), geomagnetic latitude, magnetic local time, and McIlwain L-shell. Overlaid on each image is a trace of the electron gyrofrequency. 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
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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
DisplayData
ResourceID
spase://NASA/DisplayData/POLAR/PWI/MCA/DS/P1D
NamingAuthority
NASA
ResourceType
DisplayData
ResourceHeader
ResourceName
POLAR Plasma Wave Investigation (PWI) Multichannel Analyzer (MCA) Survey Spectrograms
DOI
https://doi.org/10.48322/anwe-2q24
ReleaseDate
2026-02-25 20:57:20Z
RevisionHistory
RevisionEvent
ReleaseDate
2020-07-07 19:48:34Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-11-14 16:17:34Z
Note
Added PublicationInfo. 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 13:28:00Z
Note
Added MetadataRightsList. Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-02-25 20:57:20Z
Note
Added DOI. tlk
Description
The Polar PWI Multichannel Analyzer (MCA) collected data from March 1996 to September 1997. The MCA data has very good time resolution (~1 s) but relatively poor frequency resolution. An electric field measurement covers 5.6 Hz to 311 kHz in 20 channels logarithmically spaced. The magnetic field measurements cover a range from 5.6 Hz to 10 kHz in 14 channels logarithmically spaced. Each file consists of two plots. Each plot contains the power spectral density (color scale) of received signal (upper plot: electric (V^2 m^-2 Hz^-1), lower plot: magnetic (nT^2 Hz^-1) ) as a function of operating frequency (in a logarithmic scale on vertical axis) and time (horizontal axis). At the top of each plot is a title indicating the Instrument, Receiver and Antenna used along with the time span for the spectrogram. Overlaid on each image is a trace of the electron gyrofrequency. Beneath the time labels on the horizontal axis of the lower plot are ephemeris data: position of the spacecraft in radial distance (Earth radii), geomagnetic latitude, magnetic local time, and McIlwain L-shell. Overlaid on each image is a trace of the electron gyrofrequency. Reference: Gurnett, D.A. et al, The Polar plasma wave instrument, Space Science Reviews, Vol. 71, pp. 597-622, 1995.
PublicationInfo
Authors
Gurnett, Donald A.
PublicationDate
2025-11-14 16:17:34Z
PublishedBy
University of Iowa
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Donald.A.Gurnett
2.
GeneralContact
spase://SMWG/Person/J.Douglas.Menietti
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
InformationURL
Name
User's Guide to PWI Receiver Design Features and Modes
URL
http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/modes.html
Description
Descriptions of PWI receiver and antenna modes.
Language
en
Association
AssociationID
spase://NASA/NumericalData/POLAR/PWI/MCA/PT1.3S
AssociationType
DerivedFrom
PriorIDs
spase://VWO/DisplayData/POLAR/PWI/MCA.DS.P1D
spase://VSPO/DisplayData/POLAR/PWI/MCA/DS/P1D
AccessInformation
RepositoryID
spase://SMWG/Repository/UIowa/RadioPlasmaWaveGroup
Availability
Online
AccessRights
Open
AccessURL
Name
PWI Multichannel Analyzer Survey and Eclipse Data
URL
http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/mca/
Description
Access to web pages listing GIF format plots for Polar PWI MCA dynamic spectrograms.
Language
en
Format
GIF
Encoding
None
InstrumentIDs
spase://SMWG/Instrument/POLAR/PWI
MeasurementType
Waves.Passive
MeasurementType
Spectrum
MeasurementType
ElectricField
MeasurementType
MagneticField
TemporalDescription
TimeSpan
StartDate
1996-03-25 00:00:00Z
StopDate
1997-09-16 17:00:00Z
SpectralRange
RadioFrequency
DisplayCadence
P1D
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.NearSurface.Plasmasphere
ObservedRegion
Earth.NearSurface.AuroralRegion
ObservedRegion
Earth.NearSurface.PolarCap
ObservedRegion
Heliosphere.Inner
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
MCA Electric Power Spectral Density
Caveats
See the web page on Polar PWI Interpretation Issues http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/interpretation.html
Cadence
P1D
Units
V^2 m^-2 Hz^-1
Wave
WaveType
PlasmaWaves
Qualifier
Magnitude
Qualifier
Pseudo
WaveQuantity
ACElectricField
FrequencyRange
SpectralRange
RadioFrequency
Low
0.0056
High
311
Units
kHz
Parameter #2
Name
MCA Magnetic Power Spectral Density
Caveats
See the web page on Polar PWI Interpretation Issues http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/interpretation.html
Cadence
P1D
Units
nT^2 * Hz^-1
Wave
WaveType
PlasmaWaves
Qualifier
Magnitude
Qualifier
Pseudo
WaveQuantity
ACMagneticField
FrequencyRange
SpectralRange
RadioFrequency
Low
0.0056
High
10
Units
kHz