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- 19309803-c99e-4d14-8cd3-d64bddd8aa9e definition "SEPICA is one of nine instruments aboard the ACE spacecraft. Its mission is to collect information about particles emanating from the Sun. SEPICA detects the ionic charge state, kinetic energy, and nuclear charge of ions coming from the Sun, and with that information, one can determine not only the type of ions present, but also the history of those ions within the Sun. This aids scientists in their understanding of the Sun and the processes that take place within it. The SEPICA instrument is the prime sensor on ACE, which is used to determine the charge state distribution of energetic particle distributions. SEPICA is designed to measure the ionic charge state, Q, the kinetic energy, E, and the nuclear charge, Z, of energetic ions above 0.2 MeV/Nuc (Stone et al., 1990). This includes ions accelerated in solar flares as well as in interplanetary space during energetic storm particle (ESP) and co-rotating interaction region (CIR) events. For low mass numbers SEPICA will also separate isotopes -- for example, 3He and 4He. During solar quiet times, SEPICA should also be able to directly measure the charge states of anomalous cosmic ray nuclei, including H, N, O, and Ne, which are presumed to be singly-charged. With the capability to differentiate the charge states of ions, the instrument will also be able to separate neutral atoms (Q = 0) from ions. Thus it may be able to identify energetic neutrals created through charge exchange. The instrument is based on the design of the ULEZEQ (Ultra Low Energy Z E Q Analyzer) sensor flown on the ISEE spacecraft (Hovestadt et al., 1978). The sensor combines the determination of the electrostatic deflection of incoming ions in a collimator-analyzer assembly by the measurement of the impact position in the detector plane and a dE/dx - E telescope with a proportional counter solid state detector combination. The background from penetrating radiation is suppressed by the use of an anti-coincidence detector. The scientific objectives of the ACE mission call for significant improvements over the ULEZEQ sensor in the following parameters of the instrument: 1. Increase of the geometrical factor by at least a factor of 10 (to improve the measurement statistics significantly) 2. Improvement of the charge resolution to deltaQ/Q 0.1 below 0.7 MeV/nucleon (to allow resolution of individual charge states for elements up to oxygen. SEPICA was built as a collaboration between the UNH Space Science Group and the National Aeronautics and Space Administration (NASA). SEPICA's mission was proposed in 1986. The project was kicked off into Phase B in May of 1991, with the development and implementation of Phase C started in January, 1994. Satellite integration and testing (Phase D) was carried out through 1996 and 1997. ACE itself was launched on 25 August, 1997, on a Delta II launch vehicle, from the Kennedy Space Center in Florida. Since then, SEPICA has been returning data on the solar wind. See: http://www-ssg.sr.unh.edu/tof/Missions/Ace/index.html?acemain.html Group: Instrument_Details Entry_ID: SEPICA Group: Instrument_Identification Instrument_Category: Solar/Space Observing Instruments Instrument_Class: Particle Detectors Short_Name: SEPICA Long_Name: Solar Energetic Particle Charge Analyzer End_Group Group: Associated_Platforms Short_Name: ACE End_Group Online_Resource: http://www.ssg.sr.unh.edu/tof/Missions/Ace/index.html?sepicamain.html Sample_Image: http://helios.gsfc.nasa.gov/ace/sepica_sm.tif Group: Instrument_Logistics Data_Rate: 0.604 kbps Instrument_Start_Date: 1997-08-25 Instrument_Owner: University of New Hampshire, Space Science Group Instrument_Owner: NASA End_Group End_Group" @default.
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- 19309803-c99e-4d14-8cd3-d64bddd8aa9e path_label "Instruments" @default.
- 19309803-c99e-4d14-8cd3-d64bddd8aa9e path_label "Particle Detectors" @default.
- 19309803-c99e-4d14-8cd3-d64bddd8aa9e path_label "Solar/Space Observing Instruments" @default.
- 19309803-c99e-4d14-8cd3-d64bddd8aa9e prefLabel "SEPICA" @default.
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- 19309803-c99e-4d14-8cd3-d64bddd8aa9e tag "Instruments" @default.