MMS 4 Fast Plasma Investigation, Dual Ion Spectrometer (FPI, DIS) Partial Distribution Moments, Level 2 (L2), Fast Mode, 4.5 s Data

MMS4_FPI_FAST_L2_DIS-PARTMOMS

https://doi.org/10.48322/24jz-z578

2023-03-28 12:34:56.789

FPI usually operates in Fast Survey (FS) Mode in the MMS Region Of Interest (ROI) for the current Mission Phase. Data are taken at Burst (30/150 ms for DES/DIS) Resolution in this Mode. Data are also made available at Survey (4.5 s, etc.) Resolution. Per Mission Design, not all Burst Resolution Data are downlinked, but all Survey Data are downlinked. Planning around Calibration Activities, avoidance of Earth Radiation Belts, etc., when possible, FPI usually operates in Slow Survey (SS) Mode (60 s Resolution) outside of ROI, and then only the 60 s Resolution Survey Data are available. This Product contains Partial Moments that come from performing the Standard Moment Integrals over a limited Portion of Velocity Space. The resulting Quantities are named similarly to their corresponding Standard Moments, but are decorated with 'part' to differentiate. For example, density_part is the Density Moment integrated from a particular Energy Step to Infinity. These Partial Moments are formed from the indicated Data Type (DES/DIS Burst, FS or SS). For convenience, some additional Parameters are included to augment those most commonly found in a Moments Product of this sort, plus Time Stamps and other Annotation characterizing the State of the Instrument System at the indicated Time.

Please acknowledge D.J. Gershman, B.L. Giles, C.J. Pollock, T.E. Moore, and J.L. Burch for use of these data

spase://VSPO/NumericalData/MMS/4/FastPlasmaInvestigation/DIS/Fast/Level2/PartialMoments/PT4.5S

Online

Open

CDF

None

Please acknowledge D.J. Gershman, B.L. Giles, C.J. Pollock, T.E. Moore, and J.L. Burch. Also please acknowledge the data providers and CDAWeb when using these data.

Online

Open

CDF

None

Please acknowledge D.J. Gershman, B.L. Giles, C.J. Pollock, T.E. Moore, and J.L. Burch. Also please acknowledge the data providers and CDAWeb when using these data.

Online

Open

CSV

Please acknowledge D.J. Gershman, B.L. Giles, C.J. Pollock, T.E. Moore, and J.L. Burch. Also please acknowledge the data providers and CDAWeb when using these data.

PT4.5S

Epoch Time Tags

Epoch

Epoch Time Tags, Terrestrial Time in Nanoseconds since J2000, Reference Position given by the rotating Earth Geoid

Fast Data Begin Time derived from the Survey Packet Time This Parameter exhibits an increasing Monotonic Progression.

PT4.5S

ns

1.0e-9>s

1990-01-01T00:00:00.000000000

2100-01-01T00:00:01.000000000

9999-12-31T23:59:59.999999999

Epoch plus Var

Epoch_plus_var

Epoch plus Var

PT4.5S

s

1.0>s

0.0

4.5

Epoch minus Var

Epoch_minus_var

Epoch minus Var

PT4.5S

s

0.0

4.5

Data Quality Error Flags

Time Series defined by using: EPOCH

mms4_dis_errorflags_fast

Vector of Data Quality Flag Indicators at the Survey Start Time

Value of Zero signifies no Quality Errors. For Non-zero Values: Bit-0=Manually flagged Interval, Bit-1=Overcounting/saturation Effects likely present in Skymap, Bit-2=Reported Spacecraft Potential above 20 V, Bit-3=Invalid/unavailable Spacecraft Potential, Bit-4=Significant (>10%) Cold Plasma (<10 eV) Component, Bit-5=Significant (>25%) Hot Plasma (>30 keV) Component, Bit-6=High Sonic Mach Number (v/vth>2.5), Bit-7=Low calculated Density (n_DIS<0.05 cm^-3), Bit-8=Bent Pipe Magnetic Field used instead of Srvy l2pre Magnetic Field, Bit-10=No internally generated Photoelectron Correction applied, Bit-11=Compression Pipeline Error, Bit-12=Spintone Calculation Error, DBCS only, Bit-13=Significant (≥20%) Penetrating Radiation

PT4.5S

0

4294967294

4294967295

Partial Ion Number Density

Time Series defined by using: EPOCH

mms4_dis_numberdensity_part_fast

Partial Ion Number Density during this Survey

PT4.5S

cm^-3

1.0e6>m^-3

0.0

100000.0

-1.0e+31

DBCS Partial Ion Bulk Velocity, Despun Body Coordinates

Time Series defined by using: EPOCH

mms4_dis_bulkv_part_dbcs_fast

Partial Ion Bulk Velocity Vector in the Despun Body Coordinate System, DBCS, during this Survey.

• Column 2 Labels from : ["Vx_DBCS","Vy_DBCS","Vz_DBCS"].

PT4.5S

km/s

1.0e3>m/s

-1.0e+31

Partial Ion Bulk Velocity, Geocentric Solar Ecliptic Coordinates

Time Series defined by using: EPOCH

mms4_dis_bulkv_part_gse_fast

Partial Ion Bulk Velocity Vector in Geocentric Solar Ecliptic, GSE, Coordinates during this Survey.

• Column 2 Labels from : ["Vx_GSE","Vy_GSE","Vz_GSE"].

PT4.5S

km/s

1.0e3>m/s

-1.0e+31

Partial Ion Pressure Tensor, Despun Body Coordinates

Time Series defined by using: EPOCH

mms4_dis_prestensor_part_dbcs_fast

Partial Ion Pressure Tensor in the Despun Body Coordinate System, DBCS, during this Survey.

• Column 2 Labels from : ["x","y","z"].
• Column 3 Labels from : ["x","y","z"].

The 3⨯3 Matrix is represented as Row 1: Pxx Pxy Pxz, Row 2: Pyx Pyy Pyz, Row 3: Pzx Pzy Pzz. Note that Pij=Pji.

PT4.5S

nPa

1.0e-9>Pa

-1.0e+31

Partial Ion Pressure Tensor, Geocentric Solar Ecliptic Coordinates

Time Series defined by using: EPOCH

mms4_dis_prestensor_part_gse_fast

Partial Ion Pressure Tensor in Geocentric Solar Ecliptic, GSE, Coordinates during this Survey.

• Column 2 Labels from : ["x","y","z"].
• Column 3 Labels from : ["x","y","z"].

The 3⨯3 Matrix is represented as Row 1: Pxx Pxy Pxz, Row 2: Pyx Pyy Pyz, Row 3: Pzx Pzy Pzz. Note that Pij=Pji.

PT4.5S

nPa

1.0e-9>Pa

-1.0e+31

Partial Ion Temperature Tensor, Despun Body Coordinates

Time Series defined by using: EPOCH

mms4_dis_temptensor_part_dbcs_fast

Partial Ion Temperature Tensor in the Despun Body Coordinate System, DBCS, during this Survey.

• Column 2 Labels from : ["x","y","z"].
• Column 3 Labels from : ["x","y","z"].

The 3⨯3 matrix is represented as Row 1: Txx Txy Txz, Row 2: Tyx Tyy Tyz, Row 3: Tzx Tzy Tzz. Note that Tij=Tji.

PT4.5S

eV

11604.5052>K

-1.0e+31

Partial Ion Temperature Tensor, Geocentric Solar Ecliptic Coordinates

Time Series defined by using: EPOCH

mms4_dis_temptensor_part_gse_fast

Partial Ion Temperature Tensor in Geocentric Solar Ecliptic, GSE, Coordinates during this Survey.

• Column 2 Labels from : ["x","y","z"].
• Column 3 Labels from : ["x","y","z"].

The 3⨯3 matrix is represented as Row 1: Txx Txy Txz, Row 2: Tyx Tyy Tyz, Row 3: Tzx Tzy Tzz. Note that Tij=Tji.

PT4.5S

eV

11604.5052>K

-1.0e+31

Partial Ion Parallel Temperature

Time Series defined by using: EPOCH

mms4_dis_temppara_part_fast

Partial Ion Parallel Temperature during this Survey

PT4.5S

eV

11604.5052>K

0.0

1.0e+30

-1.0e+31

Partial Ion Perpendicular Temperature

Time Series defined by using: EPOCH

mms4_dis_tempperp_part_fast

Partial Ion Perpendicular Temperature during this Survey

PT4.5S

eV

11604.5052>K

0.0

1.0e+30

-1.0e+31

Recommended Energy Index

Time Series defined by using: EPOCH

mms4_dis_part_index_fast

Recommended Energy Index during this Survey, the Energy Index is an Integer ranging from 0 to 31

PT4.5S

0

31

65535

Fast Sky Map Parity 0/1 Energies

Time Series defined by using: EPOCH

mms4_dis_energy_fast

Fast Sky Map Parity 0/1 Energy Table Values

Geometric Mean of Parity 0 and Parity 1 Energies in the 64-Step FPI Energy Table

PT4.5S

eV

1.602176565e-19>J

0.0

30000.0

-1.0e+31

Fast Sky Map Delta Energies

Time Series defined by using: EPOCH

mms4_dis_energy_delta_fast

Fast Sky Map Delta Energy Table Values

Note that the Deltas are provided to indicate that the FPI is reporting the Energy Bin Centers. These Energy Bin Centers do not necessarily reflect the Energy Bandwidth that is sampled by FPI at a given Energy Step.

PT4.5S

eV

1.602176565e-19>J

0.0

5000.0

-1.0e+31

Mean Spacecraft Potential

Time Series defined by using: EPOCH

mms4_dis_scpmean_fast

Mean Spacecraft Potential

PT4.5S

V

0.0

5000.0

-1.0e+31

Magnetic Field Direction Unit Vector, Bhat, Despun Body Coordinates

Time Series defined by using: EPOCH

mms4_dis_bhat_dbcs_fast

Magnetic Field Direction Unit Vector, Bhat, in the Despun Body Coordinate System, DCBS

Magnetic Field Direction Unit Vector specifying the Direction used for Pitch Angle Determination

PT4.5S

-110000.0

110000.0

-1.0e+31

Despun Body Coordinate System to Geocentric Solar Ecliptic Transformation Matrix

Time Series defined by using: EPOCH

mms4_dis_gse_xform_fast

Despun Body Coordinate System, DBCS, to Geocentric Solar Ecliptic, GSE, Coordinate System Transformation Matrix

Matrix used to transform from DBCS Coordinates to GSE Coordinates

PT4.5S

-1.0e+31