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NumericalData

ResourceID
spase://CSA/NumericalData/GO-ABOVE/VLF/L2/Athabasca/PT1M
ResourceHeader
ResourceName
ABOVE Level-2 Amplitude and Phase of VLF transmitter signals at Athabasca (atha)
ReleaseDate
2023-06-21 17:04:35
RevisionHistory
RevisionEvent
ReleaseDate
2022-10-25 11:50:20
Note
Added Name field to the AccessURL and modified RepositoryID
RevisionEvent
ReleaseDate
2022-12-27 11:50:20
Note
Added Parameter Key and modified Parameter Names and Descriptions
Description

Amplitude and phase for narrowband transmitters at
ABOVE site Athabasca, Alberta, Lat: 54.60, Lon: -113.65. The Array
for Broadband Observations of VLF/ELF Emissions (ABOVE) Level-2 CDF
files of Amplitude, Phase and Bearing
at 1 minute resolution for seven VLF transmitters as observed from
each station of the ABOVE array.

The VLF transmitters observed are:

NDK (LaMoure, North Dakota, 46.37 N, 98.33 W, 25.2 kHz)

NAA (Cutler, Maine, 44.64 N, 67.29 W, 24.0 kHz),

NLK (Seattle, Washington, 48.20 N 121.92 W, 24.8 kHz)

NWC (Exmouth, Western Australia, 21.82 S, 114.16 E, 19.8 kHz)

NPM (Lualualei, Hawaii, 21.42 N, 158.15 W, 21.4 kHz)

NRK (Keflavik, Iceland, 63.85 N, 22.45 W, 37.5 kHz)

WWVB (Fort Collins, Colorado, 40.68 N, 105.05 W, 60 kHz)

GO-ABOVE is a ground‐based array of VLF radio receivers located across Canada and run as a part of the Canadian Space Agency's Geospace Observatory (GO). The ABOVE instruments are situated in two north‐south chains in Alberta and Manitoba, through the region roughly from L = 3 through L = 8. The ABOVE instruments monitor electromagnetic waves in a frequency range from 100 Hz to 75 kHz, covering chorus and hiss emissions as well as U.S. Navy transmitters near 25 kHz. The absolute timing accuracy is 10 ns, from GPS.

Acknowledgement
Please include the following in any publications using this data: Infrastructure funding for ABOVE is provided by the Canada Foundation for Innovation and the province of Alberta. ABOVE data used in this work was collected with the support of the Canadian Space Agency Geospace Observatory (GO Canada) contribution initiative.
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/C.M.Cully
2.MetadataContactspase://SMWG/Person/Leonard.N.Garcia
AccessInformation
RepositoryID
AccessURL
Name
GO-ABOVE CDFs from University of Calgary Space Physics Data Page
URL
Description

Directory tree to access Level-1 and Level-2 CDF data.

Format
CDF
InstrumentIDs
MeasurementType
Waves.Passive
TemporalDescription
TimeSpan
StartDate
2014-08-13 18:00:00
StopDate
2019-10-01 05:45:00
Cadence
PT1M
SpectralRange
RadioFrequency
ObservedRegion
Earth.NearSurface.Ionosphere
Parameter #1
Name
Epoch
Support
SupportQuantity
Temporal
Parameter #2
Name
Phase ndk-atha
ParameterKey
abv_phase_atha_ndk
Description

Phase of VLF transmitter NDK observed at atha.
Phases for upper (space) and lower (mark) frequencies have been combined. Phase is calculated along direction of maximum amplitude.

Units
radians
Field
Qualifier
PhaseAngle
FieldQuantity
Magnetic
Parameter #3
Name
Amplitude ndk-atha
ParameterKey
abv_amp_atha_ndk
Description

Amplitude of VLF transmitter NDK observed at atha.
Amplitude is calculated separately for North-South and East-West antennas.

Units
ADC units
Field
Qualifier
Average
FieldQuantity
Magnetic
Parameter #4
Name
Bearing ndk-atha
ParameterKey
abv_bearing_atha_ndk
Description

Bearing to VLF transmitter NDK observed at atha.
Bearing direction is based on amplitudes from the 2 antennas and always between 0 (N/S) and 90 (E/W) degrees.

Units
degrees
Field
Qualifier
DirectionAngle
FieldQuantity
Magnetic
Parameter #5
Name
Phase naa-atha
ParameterKey
abv_phase_atha_naa
Description

Phase of VLF transmitter NAA observed at atha.
Phases for upper (space) and lower (mark) frequencies have been combined. Phase is calculated along direction of maximum amplitude.

Units
radians
Field
Qualifier
PhaseAngle
FieldQuantity
Magnetic
Parameter #6
Name
Amplitude naa-atha
ParameterKey
abv_amp_atha_naa
Description

Amplitude of VLF transmitter NAA observed at atha.
Amplitude is calculated separately for North-South and East-West antennas.

Units
ADC units
Field
Qualifier
Average
FieldQuantity
Magnetic
Parameter #7
Name
Bearing naa-atha
ParameterKey
abv_bearing_atha_naa
Description

Bearing to VLF transmitter NAA observed at atha.
Bearing direction is based on amplitudes from the 2 antennas and always between 0 (N/S) and 90 (E/W) degrees.

Units
degrees
Field
Qualifier
DirectionAngle
FieldQuantity
Magnetic
Parameter #8
Name
Phase nlk-atha
ParameterKey
abv_phase_atha_nlk
Description

Phase of VLF transmitter NLK observed at atha.
Phases for upper (space) and lower (mark) frequencies have been combined. Phase is calculated along direction of maximum amplitude.

Units
radians
Field
Qualifier
PhaseAngle
FieldQuantity
Magnetic
Parameter #9
Name
Amplitude nlk-atha
ParameterKey
abv_amp_atha_nlk
Description

Amplitude of VLF transmitter NLK observed at atha.
Amplitude is calculated separately for North-South and East-West antennas.

Units
ADC units
Field
Qualifier
Average
FieldQuantity
Magnetic
Parameter #10
Name
Bearing nlk-atha
ParameterKey
abv_bearing_atha_nlk
Description

Bearing to VLF transmitter NLK observed at atha.
Bearing direction is based on amplitudes from the 2 antennas and always between 0 (N/S) and 90 (E/W) degrees.

Units
degrees
Field
Qualifier
DirectionAngle
FieldQuantity
Magnetic
Parameter #11
Name
Phase nwc-atha
ParameterKey
abv_phase_atha_nwc
Description

Phase of VLF transmitter NWC observed at atha.
Phases for upper (space) and lower (mark) frequencies have been combined. Phase is calculated along direction of maximum amplitude.

Units
radians
Field
Qualifier
PhaseAngle
FieldQuantity
Magnetic
Parameter #12
Name
Amplitude nwc-atha
ParameterKey
abv_amp_atha_nwc
Description

Amplitude of VLF transmitter NWC observed at atha.
Amplitude is calculated separately for North-South and East-West antennas.

Units
ADC units
Field
Qualifier
Average
FieldQuantity
Magnetic
Parameter #13
Name
Bearing nwc-atha
ParameterKey
abv_bearing_atha_nwc
Description

Bearing to VLF transmitter NWC observed at atha.
Bearing direction is based on amplitudes from the 2 antennas and always between 0 (N/S) and 90 (E/W) degrees.

Units
degrees
Field
Qualifier
DirectionAngle
FieldQuantity
Magnetic
Parameter #14
Name
Phase npm-atha
ParameterKey
abv_phase_atha_npm
Description

Phase of VLF transmitter NPM observed at atha.
Phases for upper (space) and lower (mark) frequencies have been combined. Phase is calculated along direction of maximum amplitude.

Units
radians
Field
Qualifier
PhaseAngle
FieldQuantity
Magnetic
Parameter #15
Name
Amplitude npm-atha
ParameterKey
abv_amp_atha_npm
Description

Amplitude of VLF transmitter NPM observed at atha.
Amplitude is calculated separately for North-South and East-West antennas.

Units
ADC units
Field
Qualifier
Average
FieldQuantity
Magnetic
Parameter #16
Name
Bearing npm-atha
ParameterKey
abv_bearing_atha_npm
Description

Bearing to VLF transmitter NPM observed at atha.
Bearing direction is based on amplitudes from the 2 antennas and always between 0 (N/S) and 90 (E/W) degrees.

Units
degrees
Field
Qualifier
DirectionAngle
FieldQuantity
Magnetic
Parameter #17
Name
Phase nrk-atha
ParameterKey
abv_phase_atha_nrk
Description

Phase of VLF transmitter NRK observed at atha.
Phases for upper (space) and lower (mark) frequencies have been combined. Phase is calculated along direction of maximum amplitude.

Units
radians
Field
Qualifier
PhaseAngle
FieldQuantity
Magnetic
Parameter #18
Name
Amplitude nrk-atha
ParameterKey
abv_amp_atha_nrk
Description

Amplitude of VLF transmitter NRK observed at atha.
Amplitude is calculated separately for North-South and East-West antennas.

Units
ADC units
Field
Qualifier
Average
FieldQuantity
Magnetic
Parameter #19
Name
Bearing nrk-atha
ParameterKey
abv_bearing_atha_nrk
Description

Bearing to VLF transmitter NRK observed at atha.
Bearing direction is based on amplitudes from the 2 antennas and always between 0 (N/S) and 90 (E/W) degrees.

Units
degrees
Field
Qualifier
DirectionAngle
FieldQuantity
Magnetic
Parameter #20
Name
Phase wwvb-atha
ParameterKey
abv_phase_atha_wwvb
Description

Phase of VLF transmitter WWVB observed at atha.
Phases for upper (space) and lower (mark) frequencies have been combined. Phase is calculated along direction of maximum amplitude.

Units
radians
Field
Qualifier
PhaseAngle
FieldQuantity
Magnetic
Parameter #21
Name
Amplitude wwvb-atha
ParameterKey
abv_amp_atha_wwvb
Description

Amplitude of VLF transmitter WWVB observed at atha.
Amplitude is calculated separately for North-South and East-West antennas.

Units
ADC units
Field
Qualifier
Average
FieldQuantity
Magnetic
Parameter #22
Name
Bearing wwvb-atha
ParameterKey
abv_bearing_atha_wwvb
Description

Bearing to VLF transmitter WWVB observed at atha.
Bearing direction is based on amplitudes from the 2 antennas and always between 0 (N/S) and 90 (E/W) degrees.

Units
degrees
Field
Qualifier
DirectionAngle
FieldQuantity
Magnetic