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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. 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."}]},{"Instrument_type":[{"0":"Plasma and Solar Wind"},{"1":"Particles (space)"}]},{"Mission_group":[{"0":"MMS"}]},{"Logical_source":[{"0":"mms4_fpi_fast_l2_des-partmoms"}]},{"Logical_file_id":[{"0":"mms4_fpi_fast_l2_des-partmoms_20180604180000_v3.3.0"}]},{"Logical_source_description":[{"0":"MMS Satellite Number 4 Dual Electron Spectrometer FastSurvey-resolution partial moments"}]},{"Time_resolution":[{"0":"4.5 seconds"}]},{"Rules_of_use":[{"0":"See FPI Version Release Notes (https://lasp.colorado.edu/mms/sdc/public/datasets/fpi/) for rules of use."}]},{"Generated_by":[{"0":"FPI ITF, NASA/GSFC Code 673"}]},{"Generation_date":[{"0":"Fri Dec 28 16:54:33 2018"}]},{"MODS":[{"0":"See FPI Version Release Notes (https://lasp.colorado.edu/mms/sdc/public/datasets/fpi/) for data set modification history."}]},{"LINK_TEXT":[{"0":"MMS home page"},{"1":"MMS at NASA GSFC"},{"2":"Science Data Center"},{"3":"FPI overview"}]},{"LINK_TITLE":[{"0":"at GSFC"},{"1":"Homepage"},{"2":"at LASP"},{"3":"at NASA"}]},{"HTTP_LINK":[{"0":"https://mms.gsfc.nasa.gov"},{"1":"https://mms.gsfc.nasa.gov/index.html"},{"2":"http://lasp.colorado.edu/mms/sdc"},{"3":"https://mms.gsfc.nasa.gov"}]},{"Skeleton_version":[{"0":"$Revision: 8924 $"}]},{"Skeleton_revdate":[{"0":"$Date: 2018-10-30 12:23:12 -0400 (Tue, 30 Oct 2018) $"}]},{"Correction_table_name":[{"0":"mms4_des_fast_f1ct_v35-0886_0889_p3-5.cdf"}]},{"Correction_table_rev":[{"0":"8691"}]},{"Correction_table_scaling_factor":[{"0":"0.80000"}]},{"Energy_table_name":[{"0":"energies_des_3-5.txt"}]},{"Dead_time_correction":[{"0":"100 ns"}]},{"Magnetic_field_filenames":[{"0":"mms4_fgm_srvy_l2_20180604_v5.141.0.cdf mms4_fgm_srvy_l2_20180605_v5.143.0.cdf"}]},{"Spacecraft_potential_filenames":[{"0":"mms4_edp_fast_l2_scpot_20180604000000_v2.5.1.cdf mms4_edp_fast_l2_scpot_20180605000000_v2.5.3.cdf"}]},{"Spacecraft_potential_scaling_factor":[{"0":"1.0"}]},{"Spacecraft_potential_offset":[{"0":"0.0"}]},{"Photoelectron_model_filenames":[{"0":"mms_fpi_fast_l2_des-bgdist_v1.1.0_p3-5.cdf"}]},{"Photoelectron_model_scaling_factor":[{"0":"0.3500000"}]},{"Photoelectron_filter":[{"0":"Off"}]},{"Low_energy_extrapolation":[{"0":"Disabled"}]},{"High_energy_extrapolation":[{"0":"Enabled"}]},{"Spacecraft_attitude_filenames":[{"0":"MMS4_DEFATT_2018155_2018156.V00"}]},{"Lower_energy_integration_limit":[{"0":"10.00eV"}]},{"Upper_energy_integration_limit":[{"0":"highest energy step"}]},{"Energy_e0":[{"0":"100.00eV"}]},{"Scp_energy_fraction":[{"0":"1.00eV"}]},{"Skymap_avgN":[{"0":"1"}]},{"spase_DatasetResourceID":[{"0":"spase://NASA/NumericalData/MMS/4/FastPlasmaInvestigation/DES/Fast/Level2/PartialMoments/PT4.5S"}]},{"DOI":[{"0":"https://doi.org/10.48322/yvzm-q092"}]}],"CDFVariables":[{"Epoch":[{"VarDescription":[{"DataType":"CDF_TIME_TT2000"},{"NumElements":1},{"NumDims":0},{"RecVariance":"VARY"},{"PadValue":"0000-01-01T00:00:00.000000000"}]},{"VarAttributes":[{"CATDESC":"Nanoseconds since J2000"},{"DELTA_PLUS_VAR":"Epoch_plus_var"},{"DELTA_MINUS_VAR":"Epoch_minus_var"},{"FIELDNAM":"Time tags"},{"FILLVAL":"9999-12-31T23:59:59.999999999"},{"LABLAXIS":"Epoch"},{"MONOTON":"INCREASE"},{"REFERENCE_POSITION":"Rotating Earth Geoid"},{"SCALETYP":"linear"},{"SI_CONVERSION":"1.0e-9>s"},{"TIME_BASE":"J2000"},{"TIME_SCALE":"Terrestrial Time"},{"UNITS":"ns"},{"VALIDMIN":"1990-01-01T00:00:00.000000000"},{"VALIDMAX":"2099-12-31T23:59:59.000000000"},{"VAR_NOTES":"MMS4 FPI/DES survey data begin-time; 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