2.3.1 spase://CNES/NumericalData/CDPP-AMDA/ACE/SWEPAM/ace-swe-all sw : final Solar Wind 64-Second Level 2 Data 2017-03-12T10:49:29Z Solar Wind Ion parameters from ACE/SWEPAM. Level 2 data, 64-second averages (from AC_H0_SWE dataset). Parameters include proton density, temperature (radial component) and flow speed, flow velocity vector in GSE and GSM coordinates, and alpha to proton density ratio. AMDA presents temperature in eV. The ram pressure is calculated using P=rho*Np*Vp², where rho=1.672622*(1+4*(1/(1-He++_ratio)-1)). We use rho=2 here, which corresponds to a ratio of He++ between 4% and 5%. Please acknowledge the ACE/SWEPAM instrument team and the ACE Science Center spase://CNES/Person/David.J.McComas CoInvestigator spase://SMWG/Person/Ruth.Skoug TechnicalContact ACE SWEPAM Level 2 data Home Page http://www.srl.caltech.edu/ACE/ASC/level2/swepam_l2desc.html ACE Science Center site hosting instrument information, data release notes, as well as web utilities for plotting and downloading data Rules of use, and caveats http://www.srl.caltech.edu/ACE/ASC/level2/policy_lvl2.html ACE level 2 data rules of use, and caveats spase://SMWG/Repository/CNES/CDPP-AMDA Online Open AMDA at CDPP http://amda.cdpp.eu NetCDF Please acknowledge the ACE/SWEPAM instrument team, the ACE Science Center, and the CDAWeb team at GSFC/SPDF. CDAWeb ac_h0_swe spase://CNES/Instrument/CDPP-AMDA/ACE/SWEPAM ThermalPlasma 1998-02-04T00:00:31Z 2018-09-06T23:59:05Z PT64S Heliosphere Heliosphere.NearEarth The quality of ACE level 2 data is such that it is suitable for serious scientific study. However, to avoid confusion and misunderstanding, it is recommended that users consult with the appropriate ACE team members before publishing work derived from the data. The ACE team has worked hard to ensure that the level 2 data are free from errors, but the team cannot accept responsibility for erroneous data, or for misunderstandings about how the data may be used. This is especially true if the appropriate ACE team members are not consulted before publication. At the very least, preprints should be forwarded to the ACE team before publication. The SWEPAM observations, in particular the proton density and to lesser extent the temperature, became increasing sparse starting in 2010 as the primary channel electron multiplier (CEM) detectors have aged. Now, many years past the original planned mission lifetime, these Ulysses spare detectors do not provide adequate gain to make good measurements. In response, the ACE science team has developed and implemented, starting Oct 23 2012, an innovative mission operations concept that more frequently repoints the ACE spacecraft's spin axis further away from the Sun. This allows other, stronger CEMs that have received significantly less total fluence to measure the solar wind; this operational improvement has significantly increased the frequency of good quality SWEPAM observations, back to levels not seen in several years. v_gse sw_v_gse phys.veloc;phys.atmol.ionStage km/s TimeSeries 3 vx 1 sw_v_gse(0) vy 2 sw_v_gse(1) vz 3 sw_v_gse(2) Proton Velocity v_gsm sw_v_gsm phys.veloc;phys.atmol.ionStage km/s TimeSeries 3 vx 1 sw_v_gsm(0) vy 2 sw_v_gsm(1) vz 3 sw_v_gsm(2) Proton Velocity density sw_n Solar Wind Proton Number Density, scalar phys.density;phys.atmol.ionStage Np is the proton number density in units of cm-3, as calculated by integrating the ion distribution function. cm^-3 TimeSeries 0.0 200.0 -1.0E31 Proton Moment NumberDensity v_bulk sw_vb Solar Wind Bulk Speed phys.veloc;phys.atmol.ionStage Vp is the solar wind proton speed, or more generally just the solar wind (bulk) speed. It is obtained by integrating the ion (proton) distribution function. km/s TimeSeries 0.0 2500.0 -1.0E31 Proton Moment Scalar Velocity t_radial sw_t radial component of the proton temperature phys.temperature;phys.atmol.ionStage The radial component of the proton temperature is the (1,1) component of the temperature tensor, along the radial direction. It is obtained by integration of the ion (proton) distribution function. eV TimeSeries 1000.0 1100000.0 -1.0E31 Proton Moment Temperature alpha/proton ratio sw_he alpha to proton density ratio phys.density;arith.ratio;phys.atmol.ionStage Alpha ratio (Na/Np) - is the ratio of the number density of helium++ ions to the number density of protons. TimeSeries 0.0 10.0 -1.0E31 AlphaParticle Proton Ratio NumberDensity ram pressure sw_pdyn P = 2*10e-6 * Np * Vp^2 nPa TimeSeries