Polar Plasma Wave Instrument (PWI), High Frequency Waveform Receiver, 25kHz bandwidth, 6-channel fields

https://doi.org/10.48322/7vp8-5w49

2023-07-30 12:34:56.789

PWI>Plasma Wave Instrument Reference: Gurnett, D.A. et al, The Polar Plasma Wave Instrument, Space Science Reviews, Vol. 71, pp. 597-622, 1995. donald-gurnett@uiowa.edu An FFT on 1024 values was used in calibrating the data; i.e., perform FFT, calibrate in 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. Effective bandwidth is 1.5delta_f, where delta_f depends on the size of the FFT used to convert to the frequency domain, and delta_t. These data come in snapshots of 31816 points per channel, every 9.2 seconds, where the duration of each snapshot is 0.045 seconds. The time for individual samples is the epoch time of the snapshot incremented by delta_t in milliseconds for each successive sample. That is: sample_time = epoch_time + sample_offset * delta_t The data in this file will be in sets of 31744 (311024) points per channel because the FFT size does not come out even within the number of points per snapshot. To obtain the time for each point in the snapshot, increment each Epoch time after the first with Delta_T (in ms). The unattenuated frequency range for this file type is 20Hz to 25000Hz. The cadence value given here is computed from the inverse of the sampling rate (71.43 kHz). For a description of the PWI receivers and the different operational modes see: http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/modes.html

UIowa, Donald A. Gurnett

spase://VWO/NumericalData/POLAR/PWI/HFWR.25kHz.PT0.000014S

spase://VSPO/NumericalData/POLAR/PWI/HFWR/25kHz/PT0.000014S

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UIowa, Donald A. Gurnett

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UIowa, Donald A. Gurnett and the Space Physics Data Facility at NASA/GSFC

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CSV

PT0.000014S

Time

Epoch

Time, begin time of HFWR snapshot

Gain changes may occur at these times

ms

27-Feb-1996 00:00:00.000

29-Apr-2008 00:00:00.000

-1.0e+31

Gain for HFWR Channel 1 (Ex)

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation.

Gain1

Channel 1 Gain (HFWR)

dB

0

30

-1

Gain for HFWR Channel 2 (Ey)

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation.

Gain2

Channel 2 Gain (HFWR)

dB

0

30

-1

Gain for HFWR Channel 3 (Ez)

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation.

Gain3

Channel 3 Gain (HFWR)

0

30

-1

Gain for HFWR Magnetic Field (Bx, By, Bz)

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation.

MGain

M Gain (HFWR)

0

30

-1

HFWR Elec. Field Antenna Ex

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): HFWR Elec Field Antenna Ex (perp and outward in Local-Field Aligned/LFA coords).

HFWR_Ex

HFWR Elec Field Antenna Ex (perp and outward in Local-Field Aligned/LFA coords)

When FFT is applied, Filter Rolls off at 25 kHz

mV/m

-10.0

10.0

-1.0e+31

HFWR Elec. Field Antenna Ey

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): HFWR Elec Field Antenna Ey (perp and eastward in Local-Field Aligned/LFA coords).

HFWR_Ey

HFWR Elec Field Antenna Ey (perp and eastward in Local-Field Aligned/LFA coords)

When FFT is applied, Filter Rolls off at 25 kHz

mV/m

-10.0

10.0

-1.0e+31

HFWR Elec. Field Antenna Ez

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): HFWR Elec Field Antenna Ez (parallel in Local-Field Aligned/LFA coords).

HFWR_Ez

HFWR Elec Field Antenna Ez (parallel in Local-Field Aligned/LFA coords)

When FFT is applied, Filter Rolls off at 25 kHz

mV/m

-10.0

10.0

-1.0e+31

HFWR Mag. Field Antenna Bx

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): HFWR Mag Field Antenna Bx (perp and outward in Local-Field Aligned/LFA coords).

HFWR_Bx

HFWR Mag Field Antenna Bx (perp and outward in Local-Field Aligned/LFA coords)

When FFT is applied, Filter Rolls off at 25 kHz

nT

-10.0

10.0

-1.0e+31

HFWR Mag. Field Antenna By

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): HFWR Mag Field Antenna By (perp and eastward in Local-Field Aligned/LFA coords).

HFWR_By

HFWR Mag Field Antenna By (perp and eastward in Local-Field Aligned/LFA coords)

When FFT is applied, Filter Rolls off at 25 kHz

nT

-10.0

10.0

-1.0e+31

HFWR Mag. Field Antenna Bz

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): HFWR Mag Field Antenna Bz (parallel in Local-Field Aligned/LFA coords).

HFWR_Bz

HFWR Mag Field Antenna Bz (parallel in Local-Field Aligned/LFA coords)

When FFT is applied, Filter Rolls off at 25 kHz

nT

-10.0

10.0

-1.0e+31

DATA_QUALITY Ex

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): Data Quality for Ex components (0 = OK, 1 = clipped or questionable).

DATA_Q_Ex

Data Quality for Ex components (0 = OK, 1 = clipped or questionable)

(0=OK,1=Other)

0

1

-1

DATA_QUALITY Ey

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): Data Quality for Ey components (0 = OK, 1 = clipped or questionable).

DATA_Q_Ey

Data Quality for Ey components (0 = OK, 1 = clipped or questionable)

(0=OK,1=Other)

0

1

-1

DATA_QUALITY Ez

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): Data Quality for Ez components (0 = OK, 1 = clipped or questionable).

DATA_Q_Ez

Data Quality for Ez components (0 = OK, 1 = clipped or questionable)

(0=OK,1=Other)

0

1

-1

DATA_QUALITY Bx

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): Data Quality for Bx components (0 = OK, 1 = clipped or questionable).

DATA_Q_Bx

Data Quality for Bx components (0 = OK, 1 = clipped or questionable)

(0=OK,1=Other)

0

1

-1

DATA_QUALITY By

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): Data Quality for By components (0 = OK, 1 = clipped or questionable).

DATA_Q_By

Data Quality for By components (0 = OK, 1 = clipped or questionable)

(0=OK,1=Other)

0

1

-1

DATA_QUALITY Bz

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): Data Quality for Bz components (0 = OK, 1 = clipped or questionable).

DATA_Q_Bz

Data Quality for Bz components (0 = OK, 1 = clipped or questionable)

(0=OK,1=Other)

0

1

-1

HFWR Elec. Field Antenna Ex Spectrogram

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC)

HFWR_Ex_Spec

Ex Spectrogram from 1024-element FFT

When FFT is applied, Filter Rolls off at 25 kHz

(V/m)^2/Hz

1E-20

1E-2

-1.0e+31

HFWR Elec. Field Antenna Ey Spectrogram

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC)

HFWR_Ey_Spec

Ey Spectrogram from 1024-element FFT

When FFT is applied, Filter Rolls off at 25 kHz

(V/m)^2/Hz

1E-20

1E-2

-1.0e+31

HFWR Elec. Field Antenna Ez Spectrogram

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC)

HFWR_Ez_Spec

Ez Spectrogram from 1024-element FFT

When FFT is applied, Filter Rolls off at 25 kHz

(V/m)^2/Hz

1E-20

1E-2

-1.0e+31

HFWR Mag. Field Antenna Bx Spectrogram

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC)

HFWR_Bx_Spec

Bx Spectrogram from 1024-element FFT

When FFT is applied, Filter Rolls off at 25 kHz

nT^2/Hz

1E-16

1E+2

-1.0e+31

HFWR Mag. Field Antenna By Spectrogram

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC)

HFWR_By_Spec

By Spectrogram from 1024-element FFT

When FFT is applied, Filter Rolls off at 25 kHz

nT^2/Hz

1E-16

1E+2

-1.0e+31

HFWR Mag. Field Antenna Bz Spectrogram

This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC)

HFWR_Bz_Spec

Bz Spectrogram from 1024-element FFT

When FFT is applied, Filter Rolls off at 25 kHz

nT^2/Hz

1E-16

1E+2

-1.0e+31