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MMS 2 Digital Signal Processor (DSP) Search Coil Magnetometer (SCM), Magnetic Field Power Spectral Density, Fast Survey

ResourceID
spase://NASA/NumericalData/MMS/2/FIELDS/DSP/Fast/Level2/MagneticFieldPowerSpectralDensity/PT2S

Description

The MMS magnetic field power spectral density (BPSD) is computed onboard by the Digital Signal Processor (DSP). The fast Fourier transform (FFT) calculation is performed on a digitized version of analog signals from the Search Coil Magnetometer (SCM) in the SCM123 coordinate system (scm1 = - x sensor; scm2 = -z sensor; scm3 = -y sensor). This data product is computed in space from individual components that are not synchronized to the 1 second pulse. Therefore, the timing between channels can be inaccurate by a fraction of a second. The samples times are interval start times taken from the x component. The spectra are calculated via a 1024-point FFT algorithm on piecewise continuous sets of waveform data. Nine signals can be processed simultaneously. Six of the twelve DC-coupled E, DC-coupled V, or SCM signals (16384 samples/s) are selected for spectral processing at 100% duty cycle. In addition, the three AC-coupled signals (262,144 kS/s) each can be processed at 6.25% duty cycle. Each of the nine signals has 16, 1024-point FFT operations every second; the field-programmable gate array (FPGA) performs 144 FFTs per second. The FFT is performed by an arithmetic logic unit (ALU), which is controlled by a state machine. Both are hard-coded into the FPGA. The operation starts by applying a 1024-point Hanning window onto a waveform. Next, an FFT is implemented. The FFT is broken into a series of "butterfly" operations performed by the ALU. The result has real and imaginary data. Power spectra are calculated by taking the sum of squares of real and imaginary values (the ALU includes a multiplier), which produces a power spectrum with 512 frequency bins. The frequency bins are then combined to give pseudo-logarithmic frequency spacing (del f)/f. The spectra are reduced to 88 frequency bins with (del f)/f between 6% and 12% when possible. Narrow-band emissions can be fit to an accuracy of (del f)/f ~3%, allowing for an accurate determination of plasma density. The spectra can be averaged in time. The fastest reporting rate of any signal is 16 spectra per second. Reporting rates can be as slow a one spectra every 16 s (averaging 256 spectra). The averaging process has 48-bit accuracy to maximize the dynamic range. The amplitudes undergo a pseudo-logarithmic compression to an 8-bit number representing over 120 dB of dynamic range at ~5% precision.

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Details

Version:2.3.2

NumericalData

ResourceID
spase://NASA/NumericalData/MMS/2/FIELDS/DSP/Fast/Level2/MagneticFieldPowerSpectralDensity/PT2S
ResourceHeader
ResourceName
MMS 2 Digital Signal Processor (DSP) Search Coil Magnetometer (SCM), Magnetic Field Power Spectral Density, Fast Survey
AlternateName
MMS2_DSP_FAST_L2_BPSD
ReleaseDate
2021-04-27 15:38:11Z
Description

The MMS magnetic field power spectral density (BPSD) is computed onboard by the Digital Signal Processor (DSP). The fast Fourier transform (FFT) calculation is performed on a digitized version of analog signals from the Search Coil Magnetometer (SCM) in the SCM123 coordinate system (scm1 = - x sensor; scm2 = -z sensor; scm3 = -y sensor). This data product is computed in space from individual components that are not synchronized to the 1 second pulse. Therefore, the timing between channels can be inaccurate by a fraction of a second. The samples times are interval start times taken from the x component. The spectra are calculated via a 1024-point FFT algorithm on piecewise continuous sets of waveform data. Nine signals can be processed simultaneously. Six of the twelve DC-coupled E, DC-coupled V, or SCM signals (16384 samples/s) are selected for spectral processing at 100% duty cycle. In addition, the three AC-coupled signals (262,144 kS/s) each can be processed at 6.25% duty cycle. Each of the nine signals has 16, 1024-point FFT operations every second; the field-programmable gate array (FPGA) performs 144 FFTs per second. The FFT is performed by an arithmetic logic unit (ALU), which is controlled by a state machine. Both are hard-coded into the FPGA. The operation starts by applying a 1024-point Hanning window onto a waveform. Next, an FFT is implemented. The FFT is broken into a series of "butterfly" operations performed by the ALU. The result has real and imaginary data. Power spectra are calculated by taking the sum of squares of real and imaginary values (the ALU includes a multiplier), which produces a power spectrum with 512 frequency bins. The frequency bins are then combined to give pseudo-logarithmic frequency spacing (del f)/f. The spectra are reduced to 88 frequency bins with (del f)/f between 6% and 12% when possible. Narrow-band emissions can be fit to an accuracy of (del f)/f ~3%, allowing for an accurate determination of plasma density. The spectra can be averaged in time. The fastest reporting rate of any signal is 16 spectra per second. Reporting rates can be as slow a one spectra every 16 s (averaging 256 spectra). The averaging process has 48-bit accuracy to maximize the dynamic range. The amplitudes undergo a pseudo-logarithmic compression to an 8-bit number representing over 120 dB of dynamic range at ~5% precision.

Acknowledgement
J. Burch, R. Ergun, O. Le Contel
Contacts
RolePerson
1.PrincipalInvestigatorspase://SMWG/Person/James.L.Burch
2.PrincipalInvestigatorspase://SMWG/Person/Robert.E.Ergun
3.PrincipalInvestigatorspase://SMWG/Person/Olivier.Le.Contel
4.MetadataContactspase://SMWG/Person/Robert.E.McGuire
5.MetadataContactspase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
The Magnetospheric Multiscale (MMS) Mission home page at Goddard Space Flight Center (GSFC)
URL
Description

The Magnetospheric Multiscale (MMS) Mission Home Page hosted by the Goddard Space Flight Center (GSFC).

PriorIDs
spase://VSPO/NumericalData/MMS/2/FIELDS/DSP/Fast/Level2/MagneticFieldPowerSpectralDensity/PT2S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

In CDF via ftp from SPDF.

AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via http from SPDF.

AccessURL
Name
CDAWeb
URL
ProductKey
MMS2_DSP_FAST_L2_BPSD
Description

Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb

Format
CDF
Encoding
None
Acknowledgement
J. Burch, R. Ergun, O. Le Contel. Please acknowledge the data providers and CDAWeb when using these data.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
MMS2_DSP_FAST_L2_BPSD
Description

Web Service to this product using the HAPI interface.

Format
CSV
Acknowledgement
J. Burch, R. Ergun, O. Le Contel. Please acknowledge the data providers and CDAWeb when using these data.
ProcessingLevel
Calibrated
InstrumentIDs
MeasurementType
MagneticField
MeasurementType
Waves.Passive
TemporalDescription
TimeSpan
StartDate
2015-03-17 00:00:00.000
RelativeStopDate
-P2M
Cadence
PT2S
ObservedRegion
Earth.Magnetosheath
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.Magnetosphere.Magnetotail
ObservedRegion
Earth.Magnetosphere.Main
ObservedRegion
Earth.Magnetosphere.RadiationBelt
ObservedRegion
Earth.NearSurface.EquatorialRegion
ObservedRegion
Earth.NearSurface.Plasmasphere
ObservedRegion
Heliosphere.NearEarth
Parameter #1
Name
Epoch
ParameterKey
Epoch
Description

Epoch

Caveats
This parameter exhibits an increasing monotonic progression.
Cadence
PT2S
Units
ns
UnitsConversion
1.0e-9>s
RenderingHints
AxisLabel
Epoch
ValueFormat
e14.8
ScaleType
LinearScale
ValidMin
1970-01-01T00:00:00.000000000
ValidMax
2030-01-01T00:00:01.999999999
FillValue
9999-12-31T23:59:59.999999999
Support
SupportQuantity
Temporal
Parameter #2
Name
mms2_dsp_bpsd_scm1
Set
Time series defined by using: EPOCH
ParameterKey
mms2_dsp_bpsd_scm1
Description

SCM BPSD, Component 1

Caveats
Average Type: standard
Cadence
PT2S
Units
nT^2/Hz
UnitsConversion
1.e-18>T^2/Hz
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SC
RenderingHints
DisplayType
Spectrogram
ValueFormat
e13.6
ScaleMin
1.0e-09
ScaleMax
0.01
ScaleType
LogScale
Structure
Size
56
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Wave
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Qualifier
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WaveQuantity
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Parameter #3
Name
mms2_dsp_bpsd_scm2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_dsp_bpsd_scm2
Description

SCM BPSD, Component 2

Caveats
Average Type: standard
Cadence
PT2S
Units
nT^2/Hz
UnitsConversion
1.e-18>T^2/Hz
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SC
RenderingHints
DisplayType
Spectrogram
ValueFormat
e13.6
ScaleMin
1.0e-09
ScaleMax
0.01
ScaleType
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Structure
Size
56
Element
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1
Index
1
RenderingHints
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8.0
Element
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2
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24.0
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3
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3
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40.0
Element
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4
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56.0
Element
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5
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5
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72.0
Element
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6
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88.0
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7
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104.0
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Element
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Index
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Qualifier
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WaveQuantity
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Parameter #4
Name
mms2_dsp_bpsd_scm3
Set
Time series defined by using: EPOCH
ParameterKey
mms2_dsp_bpsd_scm3
Description

SCM BPSD, Component 3

Caveats
Average Type: standard
Cadence
PT2S
Units
nT^2/Hz
UnitsConversion
1.e-18>T^2/Hz
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SC
RenderingHints
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ValueFormat
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-1.0e+31
Wave
WaveType
PlasmaWaves
Qualifier
Component.K
WaveQuantity
Intensity
Parameter #5
Name
mms2_dsp_bpsd_omni
Set
Time series defined by using: EPOCH
ParameterKey
mms2_dsp_bpsd_omni
Description

SCM BPSD, Omni-directional

Caveats
Average Type: standard
Cadence
PT2S
Units
nT^2/Hz
UnitsConversion
1.e-18>T^2/Hz
RenderingHints
DisplayType
Spectrogram
ValueFormat
e13.6
ScaleMin
1.0e-09
ScaleMax
0.01
ScaleType
LogScale
Structure
Size
56
Element
Name
1
Index
1
RenderingHints
AxisLabel
8.0
Element
Name
2
Index
2
RenderingHints
AxisLabel
24.0
Element
Name
3
Index
3
RenderingHints
AxisLabel
40.0
Element
Name
4
Index
4
RenderingHints
AxisLabel
56.0
Element
Name
5
Index
5
RenderingHints
AxisLabel
72.0
Element
Name
6
Index
6
RenderingHints
AxisLabel
88.0
Element
Name
7
Index
7
RenderingHints
AxisLabel
104.0
Element
Name
8
Index
8
RenderingHints
AxisLabel
120.0
Element
Name
9
Index
9
RenderingHints
AxisLabel
136.0
Element
Name
10
Index
10
RenderingHints
AxisLabel
152.0
Element
Name
11
Index
11
RenderingHints
AxisLabel
168.0
Element
Name
12
Index
12
RenderingHints
AxisLabel
184.0
Element
Name
13
Index
13
RenderingHints
AxisLabel
200.0
Element
Name
14
Index
14
RenderingHints
AxisLabel
216.0
Element
Name
15
Index
15
RenderingHints
AxisLabel
232.0
Element
Name
16
Index
16
RenderingHints
AxisLabel
248.0
Element
Name
17
Index
17
RenderingHints
AxisLabel
262.0
Element
Name
18
Index
18
RenderingHints
AxisLabel
296.0
Element
Name
19
Index
19
RenderingHints
AxisLabel
304.0
Element
Name
20
Index
20
RenderingHints
AxisLabel
336.0
Element
Name
21
Index
21
RenderingHints
AxisLabel
368.0
Element
Name
22
Index
22
RenderingHints
AxisLabel
400.0
Element
Name
23
Index
23
RenderingHints
AxisLabel
432.0
Element
Name
24
Index
24
RenderingHints
AxisLabel
464.0
Element
Name
25
Index
25
RenderingHints
AxisLabel
496.0
Element
Name
26
Index
26
RenderingHints
AxisLabel
576.0
Element
Name
27
Index
27
RenderingHints
AxisLabel
672.0
Element
Name
28
Index
28
RenderingHints
AxisLabel
736.0
Element
Name
29
Index
29
RenderingHints
AxisLabel
800.0
Element
Name
30
Index
30
RenderingHints
AxisLabel
864.0
Element
Name
31
Index
31
RenderingHints
AxisLabel
928.0
Element
Name
32
Index
32
RenderingHints
AxisLabel
992.0
Element
Name
33
Index
33
RenderingHints
AxisLabel
1088.0
Element
Name
34
Index
34
RenderingHints
AxisLabel
1216.0
Element
Name
35
Index
35
RenderingHints
AxisLabel
1344.0
Element
Name
36
Index
36
RenderingHints
AxisLabel
1472.0
Element
Name
37
Index
37
RenderingHints
AxisLabel
1600.0
Element
Name
38
Index
38
RenderingHints
AxisLabel
1728.0
Element
Name
39
Index
39
RenderingHints
AxisLabel
1856.0
Element
Name
40
Index
40
RenderingHints
AxisLabel
1984.0
Element
Name
41
Index
41
RenderingHints
AxisLabel
2176.0
Element
Name
42
Index
42
RenderingHints
AxisLabel
2432.0
Element
Name
43
Index
43
RenderingHints
AxisLabel
2688.0
Element
Name
44
Index
44
RenderingHints
AxisLabel
2944.0
Element
Name
45
Index
45
RenderingHints
AxisLabel
3200.0
Element
Name
46
Index
46
RenderingHints
AxisLabel
3456.0
Element
Name
47
Index
47
RenderingHints
AxisLabel
3712.0
Element
Name
48
Index
48
RenderingHints
AxisLabel
3968.0
Element
Name
49
Index
49
RenderingHints
AxisLabel
4352.0
Element
Name
50
Index
50
RenderingHints
AxisLabel
4864.0
Element
Name
51
Index
51
RenderingHints
AxisLabel
5376.0
Element
Name
52
Index
52
RenderingHints
AxisLabel
5888.0
Element
Name
53
Index
53
RenderingHints
AxisLabel
6400.0
Element
Name
54
Index
54
RenderingHints
AxisLabel
6912.0
Element
Name
55
Index
55
RenderingHints
AxisLabel
7424.0
Element
Name
56
Index
56
RenderingHints
AxisLabel
7936.0
ValidMin
0.0
ValidMax
100000.0
FillValue
-1.0e+31
Wave
WaveType
PlasmaWaves
Qualifier
Total
WaveQuantity
Intensity
Parameter #6
Name
epoch_timetag
ParameterKey
epoch_timetag
Description

Epoch Time Tag

Caveats
This parameter exhibits an increasing monotonic progression.
Cadence
PT2S
Units
ns
UnitsConversion
1.0e-9>s
RenderingHints
AxisLabel
epoch_timetag
ScaleType
LinearScale
ValidMin
2000-01-01T00:00:00.000000000
ValidMax
2030-01-01T00:00:01.999000000
FillValue
9999-12-31T23:59:59.999999999
Support
SupportQuantity
Temporal
Parameter #7
Name
mms2_dsp_seqcnt_bpsd
Set
Time series defined by using: EPOCH_TIMETAG
ParameterKey
mms2_dsp_seqcnt_bpsd
Description

Sequence Count

Cadence
PT2S
RenderingHints
DisplayType
TimeSeries
ValueFormat
i6
ScaleType
LinearScale
ValidMin
0
ValidMax
65535
FillValue
65535
Support
SupportQuantity
Other
Parameter #8
Name
mms2_b_freq
ParameterKey
mms2_b_freq
Description

SCM BPSD, Frequency Midpoints

Cadence
PT2S
RenderingHints
ValueFormat
e10.6
Structure
Size
56
Element
Name
1
Index
1
Element
Name
2
Index
2
Element
Name
3
Index
3
Element
Name
4
Index
4
Element
Name
5
Index
5
Element
Name
6
Index
6
Element
Name
7
Index
7
Element
Name
8
Index
8
Element
Name
9
Index
9
Element
Name
10
Index
10
Element
Name
11
Index
11
Element
Name
12
Index
12
Element
Name
13
Index
13
Element
Name
14
Index
14
Element
Name
15
Index
15
Element
Name
16
Index
16
Element
Name
17
Index
17
Element
Name
18
Index
18
Element
Name
19
Index
19
Element
Name
20
Index
20
Element
Name
21
Index
21
Element
Name
22
Index
22
Element
Name
23
Index
23
Element
Name
24
Index
24
Element
Name
25
Index
25
Element
Name
26
Index
26
Element
Name
27
Index
27
Element
Name
28
Index
28
Element
Name
29
Index
29
Element
Name
30
Index
30
Element
Name
31
Index
31
Element
Name
32
Index
32
Element
Name
33
Index
33
Element
Name
34
Index
34
Element
Name
35
Index
35
Element
Name
36
Index
36
Element
Name
37
Index
37
Element
Name
38
Index
38
Element
Name
39
Index
39
Element
Name
40
Index
40
Element
Name
41
Index
41
Element
Name
42
Index
42
Element
Name
43
Index
43
Element
Name
44
Index
44
Element
Name
45
Index
45
Element
Name
46
Index
46
Element
Name
47
Index
47
Element
Name
48
Index
48
Element
Name
49
Index
49
Element
Name
50
Index
50
Element
Name
51
Index
51
Element
Name
52
Index
52
Element
Name
53
Index
53
Element
Name
54
Index
54
Element
Name
55
Index
55
Element
Name
56
Index
56
ValidMin
0.0
ValidMax
8192.0
FillValue
-1.0e+31
Support
SupportQuantity
Other