ABOVE Level-2 Amplitude and Phase of VLF transmitter signals at Fort Smith (fsmi)

2023-06-21 17:04:35

Amplitude and phase for narrowband transmitters at
ABOVE site Fort Smith, Manitoba, Lat: 59.99, Lon: -111.84. 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.

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.

CDF

PT1M

Epoch

Phase ndk-fsmi

abv_phase_fsmi_ndk

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

radians

Amplitude ndk-fsmi

abv_amp_fsmi_ndk

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

ADC units

Bearing ndk-fsmi

abv_bearing_fsmi_ndk

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

degrees

Phase naa-fsmi

abv_phase_fsmi_naa

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

radians

Amplitude naa-fsmi

abv_amp_fsmi_naa

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

ADC units

Bearing naa-fsmi

abv_bearing_fsmi_naa

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

degrees

Phase nlk-fsmi

abv_phase_fsmi_nlk

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

radians

Amplitude nlk-fsmi

abv_amp_fsmi_nlk

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

ADC units

Bearing nlk-fsmi

abv_bearing_fsmi_nlk

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

degrees

Phase nwc-fsmi

abv_phase_fsmi_nwc

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

radians

Amplitude nwc-fsmi

abv_amp_fsmi_nwc

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

ADC units

Bearing nwc-fsmi

abv_bearing_fsmi_nwc

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

degrees

Phase npm-fsmi

abv_phase_fsmi_npm

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

radians

Amplitude npm-fsmi

abv_amp_fsmi_npm

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

ADC units

Bearing npm-fsmi

abv_bearing_fsmi_npm

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

degrees

Phase nrk-fsmi

abv_phase_fsmi_nrk

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

radians

Amplitude nrk-fsmi

abv_amp_fsmi_nrk

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

ADC units

Bearing nrk-fsmi

abv_bearing_fsmi_nrk

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

degrees

Phase wwvb-fsmi

abv_phase_fsmi_wwvb

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

radians

Amplitude wwvb-fsmi

abv_amp_fsmi_wwvb

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

ADC units

Bearing wwvb-fsmi

abv_bearing_fsmi_wwvb

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

degrees