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ACE/SWEPAM
STATUS
PI Instrument And Archive
AVAILABILITY
since 1997
REQUEST PROCEDURE
via web browser
Solar Instruments
The Advanced Composition Explorer (ACE) Solar Wind Electron, Proton, Alpha Monitor (SWEPAM) measures the solar wind plasma electron and ion fluxes as functions of direction and energy.
CONTACT
Dave McComas
Southwest Research Institute
Space Science and Engineering Division P.O. Drawer 28510 Southwest Research Institute San Antonio, TX 78228
210-522-2983
dmccomas@swri.org
SPECIFICATIONS
Spectral Range260 eV/q - 36 keV/q protons and alphas, 1.6 - 1350 eV electrons
Spectral Resolution5% or 2.5% energy DE/E for ions, 12% DE/E for electrons
Spatial Coverage and ResolutionIons: 0˚ to +65˚ polar angle range, with 5˚ resolution, 3˚-4.5˚ azimuthal angle resolution; Electrons: 10˚ - 170˚ polar angle range with 21˚ polar angle resolution, 9˚-28˚ azimuthal angle resolution
Temporal Resolution64 seconds
Data AccuracyProton Density ~15%, Proton Velocity ~1%, Proton Temperature ~20%
Data Precision
Physical ObservablesCounts as a function of energy and angle for both ions and electrons.
Derived OutputsIon and electron velocity distribution function as a function of energy and angle. Ion and electron moments. Electron pitch angle distributions.
Concurrence Opportunities
Expected Lifetime
Location or OrbitL1
Capability Summary
Scheduling
Archival DataLevel 2 validated data includes proton density, proton velocity vector, proton temperature, alpha particle to proton density ratio.
Number of Users
Planned Upgrades
Sub-InstrumentsSWEPAM-I ion electrostatic analyzer SWEPAM-E electron electostatic analyzer
Data ProductsLevel 2 validated data includes proton density, proton velocity vector, proton temperature, alpha particle to proton density ratio. Level 3 data products include the suprathermal electron pitch angle distribution, and a merged data set with the ACE magnetometer data. Electron and alpha particle moments are also calculated, although less reliably than the proton moments, and are available upon request for selected intervals.
University FacilityNo
National Ground BasedNo
SatelliteYes
Virtual ArchiveNo
REFERENCES
D. J. McComas et al., Solar Wind Electron Proton Alpha Monitor (SWEPAM) for the Advanced Composition Explorer, Space Sci. Rev., 86, 563, 1998. http://www.srl.caltech.edu/ACE/ASC/instruments.html
UPDATED ON
13 Nov 2009 15:31