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Hawkeye Electric and Magnetic Field Radio Frequency Spectrum Analyzer High Time Resolution

(2023). Hawkeye Electric and Magnetic Field Radio Frequency Spectrum Analyzer High Time Resolution [Data set]. NASA Space Physics Data Facility. https://doi.org/10.48322/etz7-wx98. Accessed on .

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

ResourceID
spase://NASA/NumericalData/Hawkeye/VLF/PT22S

Description

The CDF file contains approximately 22 second time resolution Electric and Magnetic field data, average magnetic field magnitude, and orbital position data from Hawkeye 1. The VLF experiment measured electric and magnetic fields using a 42.45-m electric dipole (tip-to-tip) which extended perpendicular to the spin axis and a search coil antenna deployed 1.58 m from the spacecraft. The electric field spectrum measurements were made in 16 logarithmically spaced frequency channels extending from 1.78 Hz to 178 kHz, and dc electric fields were also measured. The bandwidth of these channels varied from 7.5% to 30% depending on center frequency. Channel sensitivity and dynamic range were 1E-6 V/m and 100 dB, respectively. A wideband receiver was also used, with two selectable bandwidth ranges: 0.15 to 10 kHz or 1 to 45 kHz. The magnetic field spectrum was measured in eight discrete, logarithmically spaced channels from 1.78 Hz to 5.62 kHz. The bandwidth of these channels varied from 7.5% to 30% depending on frequency. The dynamic range was 100 dB, and the sensitivity ranged from 0.1 nT at 1.78 Hz to 3.4E-4 nT at 5.62 kHz. The wideband receiver described above could be used with the magnetic antenna. Each discrete channel was sampled once every 11.52 s.

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Details

Version:2.6.0

NumericalData

ResourceID
spase://NASA/NumericalData/Hawkeye/VLF/PT22S
ResourceHeader
ResourceName
Hawkeye Electric and Magnetic Field Radio Frequency Spectrum Analyzer High Time Resolution
AlternateName
HK_H0_VLF
AlternateName
Hawkeye 1 VLF instrument CDFs at NASA's CDAWeb
DOI
https://doi.org/10.48322/etz7-wx98
ReleaseDate
2023-07-30 12:34:56.789
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
Description

The CDF file contains approximately 22 second time resolution Electric and Magnetic field data, average magnetic field magnitude, and orbital position data from Hawkeye 1. The VLF experiment measured electric and magnetic fields using a 42.45-m electric dipole (tip-to-tip) which extended perpendicular to the spin axis and a search coil antenna deployed 1.58 m from the spacecraft. The electric field spectrum measurements were made in 16 logarithmically spaced frequency channels extending from 1.78 Hz to 178 kHz, and dc electric fields were also measured. The bandwidth of these channels varied from 7.5% to 30% depending on center frequency. Channel sensitivity and dynamic range were 1E-6 V/m and 100 dB, respectively. A wideband receiver was also used, with two selectable bandwidth ranges: 0.15 to 10 kHz or 1 to 45 kHz. The magnetic field spectrum was measured in eight discrete, logarithmically spaced channels from 1.78 Hz to 5.62 kHz. The bandwidth of these channels varied from 7.5% to 30% depending on frequency. The dynamic range was 100 dB, and the sensitivity ranged from 0.1 nT at 1.78 Hz to 3.4E-4 nT at 5.62 kHz. The wideband receiver described above could be used with the magnetic antenna. Each discrete channel was sampled once every 11.52 s.

Acknowledgement
Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center and Hawkeye VLF instrument Principal Investigator Don Gurnett.
PublicationInfo
Authors
Gurnett, Donald, A.
PublicationDate
2023-01-01 00:00:00
PublishedBy
NASA Space Physics Data Facility
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/Donald.A.Gurnett
2.MetadataContactspase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
Hawkeye Spacecraft
URL
Description

Hawkeye page maintained by NASA GSFC with science and instrument descriptions, data, software, and publication lists

Language
en
InformationURL
Name
NSSDC's Master Catalog
URL
Description

Information about the ELF/VLF Receivers experiment on the Hawkeye 1 mission.

PriorIDs
spase://VWO/NumericalData/Hawkeye/VLF/CDF_PT22S
spase://VWO/NumericalData/Hawkeye/VLF/PT22S
spase://VSPO/NumericalData/Hawkeye/VLF/PT22S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

FTP access to repository of Hawkeye VLF data in CDF format at NASA CDAWeb.

Language
en
AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via HTTP from SPDF

AccessURL
Name
CDAWeb
URL
ProductKey
HK_H0_VLF
Description

Repository of Hawkeye data in CDF format at NASA CDAWeb, accessible via web interface. Name of the data resource: HK_H0_VLF.

Language
en
Format
CDF
Encoding
None
Acknowledgement
Users please acknowledge Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center and Hawkeye 1 VLF instrument Principal Investigator Don Gurnett.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
HK_H0_VLF
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 Hawkeye 1 VLF instrument Principal Investigator Don Gurnett.
ProcessingLevel
Calibrated
InstrumentIDs
MeasurementType
Waves.Passive
MeasurementType
Spectrum
TemporalDescription
TimeSpan
StartDate
1974-06-08 06:45:10Z
StopDate
1978-04-26 15:59:05Z
Cadence
PT22S
SpectralRange
RadioFrequency
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.Magnetosphere.Polar
ObservedRegion
Earth.NearSurface.AuroralRegion
ObservedRegion
Earth.NearSurface.PolarCap
ObservedRegion
Heliosphere.Inner
Keywords
Dynamic Spectrogram
Spectrogram
AKR
Auroral hiss
Auroral Kilometric Radiation
Terrestrial Kilometric Radiation
TKR
Broad Band Electrostatic Noise
Continuum radiation
Ion Cyclotron Waves
Solar radio burst
Type III Solar radio burst
Parameter #1
Name
Time Line
ParameterKey
Epoch
Description

Center Time of 22 sec averaging period

Cadence
PT22S
Units
ms
Support
SupportQuantity
Temporal
Parameter #2
Name
Magnetic Field Spectral Power Density
ParameterKey
b_spd
Description

Magnetic Field Spectral Power Density at 8 Freq (2 - 5620 Hz): 1.78 Hz, 5.62 Hz, 17.8 Hz, 56.2 Hz, 178 Hz, 562 Hz, 1780 Hz, 5620 Hz

Units
nT**2/Hz
Wave
WaveType
PlasmaWaves
Qualifier
Magnitude
Qualifier
Pseudo
WaveQuantity
Intensity
FrequencyRange
SpectralRange
RadioFrequency
Low
2
High
5620
Units
Hz
Parameter #3
Name
Electric Spectral Power Density
ParameterKey
e_spd
Description

Electric Spectral Power Density at 16 Frequencies (2 Hz - 178 kHz): 1.80 Hz, 5.60 Hz, 17.8 Hz, 56.2 Hz, 178 Hz, 562 Hz, 1780 Hz, 5620 Hz, 13300 Hz, 17800 Hz, 23700 Hz, 31100 Hz, 42200 Hz, 56200 Hz, 100000 Hz, 178000 Hz

Units
(V/m)(V/m)/Hz
Wave
WaveType
PlasmaWaves
Qualifier
Magnitude
Qualifier
Pseudo
WaveQuantity
Intensity
FrequencyRange
SpectralRange
RadioFrequency
Low
2
High
178000
Units
Hz
Parameter #4
Name
Average Magnetic Field Magnitude
ParameterKey
BAVE
Description

Average magnetic Field Magnitude

Field
FieldQuantity
Magnetic
Parameter #5
Name
s/c position in SM lat/local time
ParameterKey
pos_mag
Description

Hawkeye position in Earth radii, SM magnetic latitude, SM magnetic local time

Structure
Size
3
Element
Name
RE
Index
1
Units
Re
ValidMin
0.0
ValidMax
22.0
Element
Name
SM_LAT
Index
2
Units
Deg
ValidMin
-90.0
ValidMax
90.0
Element
Name
SM_LT
Index
3
Units
Hour
ValidMin
0.0
ValidMax
24.0
Support
SupportQuantity
Positional
Parameter #6
Name
Cartesian Position GSM
ParameterKey
pos_GSM
Description

Cartesian Position GSM

Units
RE
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
X_GSM
Index
1
Element
Name
Y_GSM
Index
2
Element
Name
Z_GSM
Index
3
ValidMin
-22.0
ValidMax
22.0
Support
SupportQuantity
Positional
Parameter #7
Name
Active vs Passive Indicator
ParameterKey
activity_index
Description

Active (=1) vs Passive (=0) Indicator. Active emissions only affect the Electric Field measurements at 17.8 Hz and 56.8 Hz

Support
SupportQuantity
Other
Parameter #8
Name
Frequency (E field)
ParameterKey
e_freq
Description

16 Electric Field assoc Frequencies (2Hz - 178kHz): 1.8 5.6 17.8 56.2 178.0 562.0 1780.0 5620.0 13300.0 17800.0 23700.0 31100.0 42200.0 56200.0 100000.0 178000.0

Units
Hz
Support
SupportQuantity
Other
Parameter #9
Name
Freq band width (E field)
ParameterKey
e_freq_delta
Description

Electric Field associated Frequency band width (16 channels): 1.4 0.8 6.6 13.2 35.0 151.4 415.1 1178.0 439.0 493.5 778.5 581.0 779.5 1129.5 2464.5 2804.5

Units
Hz
Support
SupportQuantity
Other
Parameter #10
Name
Noise associated with E field
ParameterKey
e_noise
Description

Electric Field associated Noise (16 channels)

Units
(V/m)(V/m)/Hz
Wave
WaveType
PlasmaWaves
Qualifier
Magnitude
Qualifier
Pseudo
WaveQuantity
Intensity
FrequencyRange
SpectralRange
RadioFrequency
Low
2
High
178000
Units
Hz
Parameter #11
Name
Frequencies (B field)
ParameterKey
b_freq
Description

8 Associated Magnetic Field Freq (1.78 - 5620 Hz): 1.78 5.62 17.8 56.2 178.0 562.0 1780.0 5620.0

Units
Hz
Support
SupportQuantity
Other
Parameter #12
Name
Freq Band Width (B field)
ParameterKey
b_freq_delta
Description

8 Freq Band widths B field (1.565 - 1266 Hz): 1.565 0.96 6.64 12.04 36.565 154.9 517.0 1266.0

Units
Hz
Support
SupportQuantity
Other
Parameter #13
Name
Noise associated with B field
ParameterKey
b_noise
Description

Noise associated with B field (8 - channels): 0.004425 4.853E-5 7.793E-7 5.72E-8 8.993E-9 8.854E-10 3.912E-10 3.784E-10

Units
nT**2/Hz
Wave
WaveType
PlasmaWaves
Qualifier
Magnitude
Qualifier
Pseudo
WaveQuantity
Intensity
FrequencyRange
SpectralRange
RadioFrequency
Low
2
High
5620
Units
Hz