2.3.1 spase://CNES/NumericalData/CDPP-AMDA/PSP/SPC/psp-spc-fit fits SWEAP Level 3 fits 2019-11-12T10:48:29Z This data product contains derived measurements of ion properties in the solar wind, including density, temperature, velocity vector. The velocity, temperature, and density of the solar wind proton population are estimated by fitting each spectrum to a single Maxwellian or a set of Maxwellian ion populations. * p1 fit to the “primary” proton peak. This is the peak or largest amplitude observed in a given l2i spectrum. A locus of measurements is selected that includes the absolute maximum and at least the 1/e folding, if possible, on either side for this fit. * a fit to the “primary” alpha particle (He++) peak, if resolved. For l3i measurements, this is “guessed” by searching for a secondary peak in each l2i spectrum in the neighborhood of twice the p1 peak energy. * 3 if an additional high signal-to-noise feature is present in the l2i spectrum, typically due to a proton beam or shoulder but also potentially due to a cold minor ion population, a fit is attempted to the p1-subtracted residuals on this neighborhood. The POP3_MTOQ variable is used to indicate the species. * p_tot if p1 and 3 are successfully fit, and the 3 population is determined to be protons, this signifies the total proton parameters (np =total proton density, vp = center of mass velocity, wp = effective thermal velocity, accounting for both populations and their relative drift). Please acknowledge the NASA Parker Solar Probe Mission and SWEAP team led by Justin Kasper for use of data. spase://SMWG/Person/Justin.C.Kasper PrincipalInvestigator spase://SMWG/Person/Anthony.W.Case SPCInstrumentScientist User Guide https://spdf.sci.gsfc.nasa.gov/pub/data/psp/sweap/sweap_data_user_guide.pdf User Guide for Parker Solar Probe SWEAP-SPC Investigation Data Products spase://SMWG/Repository/CNES/CDPP-AMDA Online Open AMDA at CDPP http://amda.cdpp.eu Text AMDA is a science analysis system provided by the Centre de Donnees de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Universite Paul Sabatier, Toulouse SPDF psp/sweap/spc/l3/l3i/ Please acknowledge the CDAWeb team at GSFC/SPDF. spase://CNES/Instrument/CDPP-AMDA/PSP/SPC Spectrum 2018-09-02T00:00:12Z 2025-08-12T23:59:55Z PT0.2S PT250S Heliosphere.Inner Sun.Corona np1 psp_spc_np1 Number density, fitted to the “primary” proton peak cm-3 TimeSeries np1_uncertainty psp_spc_dnp1 Estimated uncertainty on the number density, fitted to the “primary” proton peak cm-3 TimeSeries wp1 psp_spc_wp1 Thermal velocity = sqrt(2kT/m), fitted to the “primary” proton peak km/s TimeSeries wp1_uncertainty psp_spc_dwp1 Estimated uncertainty on the thermal velocity, fitted to the “primary” proton peak km/s TimeSeries vp1_rtn psp_spc_vp1 Velocity vector, estimated from the radial thermal velocity fit p1 and flow angle km/s TimeSeries 3 vp1r Component.I 1 psp_spc_vp1(0) vp1t Component.J 2 psp_spc_vp1(1) vp1n Component.K 3 psp_spc_vp1(2) vp1_uncertainty psp_spc_dvp1 Velocity vector component upper uncertainties km/s TimeSeries 3 dvp1r Component.I 1 psp_spc_dvp1(0) dvp1t Component.J 2 psp_spc_dvp1(1) dvp1n Component.K 3 psp_spc_dvp1(2) na psp_spc_na Number density, fitted to the “primary” alpha particle (He++) peak, if resolved cm-3 TimeSeries na_uncertainty psp_spc_dna Estimated uncertainty on the number density, fitted to the “primary” alpha particle (He++) peak, if resolved cm-3 TimeSeries wa psp_spc_wa Thermal velocity = sqrt(2kT/m), fitted to the “primary” alpha particle (He++) peak, if resolved km/s TimeSeries wa_uncertainty psp_spc_dwa Estimated uncertainty on the thermal velocity, fitted to the “primary” alpha particle (He++) peak, if resolved km/s TimeSeries va_rtn psp_spc_va Velocity vector, estimated from the radial thermal velocity fit and flow angle km/s TimeSeries 3 var Component.I 1 psp_spc_va(0) vat Component.J 2 psp_spc_va(1) van Component.K 3 psp_spc_va(2) va_uncertainty psp_spc_dva Velocity vector component uncertainties km/s TimeSeries 3 dvar Component.I 1 psp_spc_dva(0) dvat Component.J 2 psp_spc_dva(1) dvan Component.K 3 psp_spc_dva(2) n3 psp_spc_n3 Number density, fitted to the p1 substracted residuals cm-3 TimeSeries n3_uncertainty psp_spc_dn3 Estimated uncertainty on the number density, fitted to the p1 substracted residuals cm-3 TimeSeries w3 psp_spc_w3 Thermal velocity = sqrt(2kT/m), fitted to the p1 substracted residuals km/s TimeSeries w3_uncertainty psp_spc_dw3 Estimated uncertainty on the thermal velocity, fitted to the p1 substracted residuals km/s TimeSeries v3_rtn psp_spc_v3 Velocity vector, estimated from the radial thermal velocity fit and flow angle km/s TimeSeries 3 v3r Component.I 1 psp_spc_v3(0) v3t Component.J 2 psp_spc_v3(1) v3n Component.K 3 psp_spc_v3(2) v3_uncertainty psp_spc_dv3 Velocity vector component uncertainties km/s TimeSeries 3 dv3r Component.I 1 psp_spc_dv3(0) dv3t Component.J 2 psp_spc_dv3(1) dv3n Component.K 3 psp_spc_dv3(2) np_tot psp_spc_np_tot If p1 and 3 are successfully fitted, total proton density cm-3 TimeSeries np_tot_uncertainty psp_spc_dnp_tot Estimated uncertainty on the number density cm-3 TimeSeries wp_fit psp_spc_wp_tot If p1 and 3 are successfully fitted, effective thermal velocity km/s TimeSeries wp_tot_uncertainty psp_spc_dwp_tot km/s Estimated uncertainty on the thermal velocity TimeSeries vp_tot_rtn psp_spc_vp_tot If p1 and 3 are successfully fitted, center of mass velocity vector km/s TimeSeries 3 vp_totr Component.I 1 psp_spc_vp_tot(0) vp_tott Component.J 2 psp_spc_vp_tot(1) vp_totn Component.K 3 psp_spc_vp_tot(2) vp_tot_uncertainty psp_spc_dvp_tot Velocity vector component uncertainties km/s TimeSeries 3 dvp_totr Component.I 1 psp_spc_dvp_tot(0) dvp_tott Component.J 2 psp_spc_dvp_tot(1) dvp_totn Component.K 3 psp_spc_dvp_tot(2)