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- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 definition "The Solar Wind Plasma Experiment on Ulysses is accurately characterizing the bulk flow and internal state conditions of the interplanetary plasma in three dimensions on the way out to Jupiter. These observations will continue over the full range of heliocentric distances and heliographic latitudes reached by the probe after its encounter with Jupiter and consequent deflection out of the ecliptic plane. Solar wind electrons and ions are measured simultaneously with independent curved-plate electrostatic analyzers equipped with multiple Channel Electron Multipliers (CEMs). The CEMs are arranged to detect particles at chosen polar angles from the spacecraft spin axis; resolution in spacecraft azimuth is obtained by timing measurements with the spacecraft Sun clock as the spacecraft spins. Electrons with central energies extending from 0.86 eV to 814 eV are detected at seven polar angles and various combinations of azimuth angle to cover the unit sphere comprehensively, so as to enable computation of the pertinent electron velocity distribution parameters. As the average electron flux level changes with heliocentric distance, command control of the CEM counting intervals is used to extend the dynamic range. Ions are detected between 255 eV/q and 34.4 keV/q using appropriate subsets of 16 CEMs at spin angles designed to provide matrices of counts as a function of energy per charge, azimuth angle, and polar angle centered on the average direction of solar-wind flow. Data matrices are obtained every 4 min when the spacecraft is actively transmitting and every 8 min during data store periods. These matrices contain sufficient energy and angle resolution to permit a detailed characterization of the ion velocity distributions from which ion bulk parameters are derived. As the average ion flux intensity changes with heliocentric distance, the entrance aperture size is periodically optimized by command selection from a set of seven apertures on a disk driven by a stepping motor. Changes in the average solar wind flow direction relative to the Earth-pointing spacecraft spin axis are accommodated by command selection of the proper measurement matrix from a set of 11 matrices. In a separate mode of operation and under favorable conditions, heavy ions of oxygen, silicon, and iron at various charge levels are resolved. (Abstract from: S.J. Bame et al., Astron. Astrophys. Suppl. Ser. 92, 237-265, 1992) For more information, see: http://swoops.lanl.gov/ and http://ulysses.jpl.nasa.gov/spacecraft/inst_swoops.html Group: Instrument_Details Entry_ID: SWOOPS Group: Instrument_Identification Instrument_Category: Solar/Space Observing Instruments Instrument_Class: Particle Detectors Short_Name: SWOOPS Long_Name: Solar Wind Plasma Experiment (Ulysses) End_Group Group: Instrument_Associated_Sensors Short_Name: EAE/SWOOPS Short_Name: IAE/SWOOPS End_Group Group: Associated_Platforms Short_Name: ULYSSES End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: X-Ray Number_Channels: 7 Spectral_Frequency_Coverage_Range: 1 eV - 900 eV End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Gamma Ray Number_Channels: 16 Spectral_Frequency_Coverage_Range: 257 eV - 35 KeV End_Group Online_Resource: http://swoops.lanl.gov/index.html Online_Resource: http://ulysses-ops.jpl.esa.int/ulysses/archive/swoops.html Sample_Image: http://ulysses-ops.jpl.esa.int/ulysses/images/bai.gif Group: Instrument_Logistics Data_Rate: 100 kbps Instrument_Start_Date: 1990-10-06 Instrument_Owner: Los Alamos National Laboratory End_Group End_Group" @default.
- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 id "1655830" @default.
- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 path_id 02c354fd-8e2d-4825-b786-aa4b0782d1d6 @default.
- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 path_id 5f5e4f2c-61b7-4694-8680-3fc5799f6171 @default.
- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 path_label "Instruments" @default.
- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 path_label "Particle Detectors" @default.
- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 path_label "Solar/Space Observing Instruments" @default.
- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 prefLabel "SWOOPS" @default.
- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 reference "" @default.
- fb0ea25b-c9d6-496e-8a10-ba3ba0dafc84 tag "Instruments" @default.
.%20The%20CEMs%20are%20arranged%20to%20detect%20particles%20at%0Achosen%20polar%20angles%20from%20the%20spacecraft%20spin%20axis%3B%20resolution%20in%20spacecraft%0Aazimuth%20is%20obtained%20by%20timing%20measurements%20with%20the%20spacecraft%20Sun%20clock%20as%20the%0Aspacecraft%20spins.%20Electrons%20with%20central%20energies%20extending%20from%200.86%20eV%20to%20814%0AeV%20are%20detected%20at%20seven%20polar%20angles%20and%20various%20combinations%20of%20azimuth%20angle%0Ato%20cover%20the%20unit%20sphere%20comprehensively%2C%20so%20as%20to%20enable%20computation%20of%20the%0Apertinent%20electron%20velocity%20distribution%20parameters.%20As%20the%20average%20electron%0Aflux%20level%20changes%20with%20heliocentric%20distance%2C%20command%20control%20of%20the%20CEM%0Acounting%20intervals%20is%20used%20to%20extend%20the%20dynamic%20range.%20Ions%20are%20detected%0Abetween%20255%20eV%2Fq%20and%2034.4%20keV%2Fq%20using%20appropriate%20subsets%20of%2016%20CEMs%20at%20spin%0Aangles%20designed%20to%20provide%20matrices%20of%20counts%20as%20a%20function%20of%20energy%20per%0Acharge%2C%20azimuth%20angle%2C%20and%20polar%20angle%20centered%20on%20the%20average%20direction%20of%0Asolar-wind%20flow.%20Data%20matrices%20are%20obtained%20every%204%20min%20when%20the%20spacecraft%20is%0Aactively%20transmitting%20and%20every%208%20min%20during%20data%20store%20periods.%20These%20matrices%0Acontain%20sufficient%20energy%20and%20angle%20resolution%20to%20permit%20a%20detailed%0Acharacterization%20of%20the%20ion%20velocity%20distributions%20from%20which%20ion%20bulk%0Aparameters%20are%20derived.%20As%20the%20average%20ion%20flux%20intensity%20changes%20with%0Aheliocentric%20distance%2C%20the%20entrance%20aperture%20size%20is%20periodically%20optimized%20by%0Acommand%20selection%20from%20a%20set%20of%20seven%20apertures%20on%20a%20disk%20driven%20by%20a%20stepping%0Amotor.%20Changes%20in%20the%20average%20solar%20wind%20flow%20direction%20relative%20to%20the%0AEarth-pointing%20spacecraft%20spin%20axis%20are%20accommodated%20by%20command%20selection%20of%0Athe%20proper%20measurement%20matrix%20from%20a%20set%20of%2011%20matrices.%20In%20a%20separate%20mode%20of%0Aoperation%20and%20under%20favorable%20conditions%2C%20heavy%20ions%20of%20oxygen%2C%20silicon%2C%20and%0Airon%20at%20various%20charge%20levels%20are%20resolved.%0A%0A(Abstract%20from%3A%20S.J.%20Bame%20et%20al.%2C%20Astron.%20Astrophys.%20Suppl.%20Ser.%2092%2C%20237-265%2C%0A1992)%20%0A%0AFor%20more%20information%2C%20see%3A%0Ahttp%3A%2F%2Fswoops.lanl.gov%2F%0Aand%0Ahttp%3A%2F%2Fulysses.jpl.nasa.gov%2Fspacecraft%2Finst_swoops.html%0A%0A%0AGroup%3A%20Instrument_Details%0A%20%20%20Entry_ID%3A%20SWOOPS%0A%20%20%20Group%3A%20Instrument_Identification%0A%20%20%20%20%20%20Instrument_Category%3A%20Solar%2FSpace%20Observing%20Instruments%0A%20%20%20%20%20%20Instrument_Class%3A%20Particle%20Detectors%0A%20%20%20%20%20%20Short_Name%3A%20SWOOPS%0A%20%20%20%20%20%20Long_Name%3A%20Solar%20Wind%20Plasma%20Experiment%20(Ulysses)%0A%20%20%20End_Group%0A%20%20%20Group%3A%20Instrument_Associated_Sensors%0A%20%20%20%20%20%20Short_Name%3A%20EAE%2FSWOOPS%0A%20%20%20%20%20%20Short_Name%3A%20IAE%2FSWOOPS%0A%20%20%20End_Group%0A%20%20%20Group%3A%20Associated_Platforms%0A%20%20%20%20%20%20Short_Name%3A%20ULYSSES%0A%20%20%20End_Group%0A%20%20%20Group%3A%20Spectral_Frequency_Information%0A%20%20%20%20%20%20Wavelength_Keyword%3A%20X-Ray%0A%20%20%20%20%20%20Number_Channels%3A%207%0A%20%20%20%20%20%20Spectral_Frequency_Coverage_Range%3A%201%20eV%20-%20900%20eV%0A%20%20%20End_Group%0A%20%20%20Group%3A%20Spectral_Frequency_Information%0A%20%20%20%20%20%20Wavelength_Keyword%3A%20Gamma%20Ray%0A%20%20%20%20%20%20Number_Channels%3A%2016%0A%20%20%20%20%20%20Spectral_Frequency_Coverage_Range%3A%20257%20eV%20-%2035%20KeV%0A%20%20%20End_Group%0A%20%20%20Online_Resource%3A%20http%3A%2F%2Fswoops.lanl.gov%2Findex.html%0A%20%20%20Online_Resource%3A%20http%3A%2F%2Fulysses-ops.jpl.esa.int%2Fulysses%2Farchive%2Fswoops.html%0A%20%20%20Sample_Image%3A%20http%3A%2F%2Fulysses-ops.jpl.esa.int%2Fulysses%2Fimages%2Fbai.gif%0A%20%20%20Group%3A%20Instrument_Logistics%0A%20%20%20%20%20%20Data_Rate%3A%20100%20kbps%0A%20%20%20%20%20%20Instrument_Start_Date%3A%201990-10-06%0A%20%20%20%20%20%20Instrument_Owner%3A%20Los%20Alamos%20National%20Laboratory%0A%20%20%20End_Group%0AEnd_Group%22){kind=link}