HR: 1340h
AN: SH44B-1735 [Abstracts]
TI: An improved ACE/SWICS efficiency model including uncertainty estimates
AU: * Koeten, M
EM: koeten@physik.uni-kiel.de
AF: Christian-Albrechts-University Kiel, Olshausenstr. 40, Kiel, 24098, Germany
AU: Berger, L
EM: berger@physik.uni-kiel.de
AF: Christian-Albrechts-University Kiel, Olshausenstr. 40, Kiel, 24098, Germany
AU: Rodde, R
EM: rodde@physik.uni-kiel.de
AF: Christian-Albrechts-University Kiel, Olshausenstr. 40, Kiel, 24098, Germany
AU: Raines, J
EM: jraines@umich.edu
AF: Dept. of Atmospheric, Oceanic and Space Sciences,
University of Michigan, 2455 Hayward St., Ann Arbor, MI 48109, United States
AU: Wimmer-Schweingruber, R F
EM: wimmer@physik.uni-kiel.de
AF: Christian-Albrechts-University Kiel, Olshausenstr. 40, Kiel, 24098, Germany
AB:
SWICS (Solar Wind Ion Composition Spectrometer) is a linear time-of-flight mass spectrometer on ACE
(Advanced Composition Explorer), launched 1997, and now at L1.
SWICS determines the ion composition of the solar wind and of suprathermal particles in interplanetary space.
For the purpose of an improved data analysis technique we have developed an advanced mathematical model of
SWICS that calculates the detection probabilities as a function of ion species, energy, and flight trajectory.
Based on careful analysis of calibration data and detailed comparison with flight data, we have included several
effects in the model:
Energy loss in the carbon foil was simulated with SRIM and adapted to flight and calibration results.
Pulse height defects were derived from calibration data.
Scattering in the foil has been improved by using results from dedicated scattering experiments performed at the
University of Bern, Switzerland.
Finally, we use the full 3-d information of the instrument to obtain accurate active areas. We present the
operational breakdown of the efficiency model and the data products the program provides, and present
uncertainty estimates for them.
DE: 2194 Instruments and techniques
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting