<_Note>Nodes prefixed with a _ are not valid SPASE, but are included for debugging. Values prefixed with a x_ are not valid SPASE but may considered for addition for completeness. 2.6.1 <_MasterURL>https://cdaweb.gsfc.nasa.gov/pub/software/cdawlib/0JSONS/uy_alpha-distributions_swoops_00000000_v01.json (from all.xml) spase://NASA/NumericalData/Ulysses/SWOOPS/AlphaParticle/FitParameters/PT4M <_ResourceID>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ResourceID.json Distribution function of alpha particles <_ResourceName>Source: Master/CDFglobalAttributes/Logical_source_description uy_alpha-distributions_swoops <_AlternateName>Source: Master/CDFglobalAttributes/Logical_source This file contains the distribution function of alpha particles. DATA REDUCTION: The SWOOPS (Solar Wind Observations Over the Poles of the Sun) ion instrument is a spherical-section curved-plate electrostatic analyzer. Particle arrival directions are measured in spacecraft coordinates of azimuth (scanned by spacecraft rotation) and elevation (determined by the detector number) angles. The spacecraft spin axis was oriented toward the Earth. The energy/charge (E/q) resolution was ~2.5% while the azimuth (phi) and elevation (theta) resolutions were both ~5.6o. A description of the SWOOPS is given in a paper by S. J. Bame, D. J. McComas, B. L. Barraclough, J. L. Phillips, K. J. Sofaly, J. C. Chavez, B. E. Goldstein, and R. K. Sakurai, Astronomy and Astrophysics Supplement Series, Ulysses Instruments Special Issue, Vol. 92, No. 2, p.237-265, 1992. The number of counts in each E/q-phi-theta bin were examined to determine the peak of the proton and alpha particle distribution, respectively, and the vector magnetic field (in spacecraft coordinates) was obtained for the time at which the peak was measured. A "coarse" 2-dimensional matrix was then formed by rotating the data into a coordinate system with axes parallel and perpendicular to the field direction. Note that gyrotropy is assumed in making that transformation. The resolution of the matrix is "coarse" because the vector velocity assigned to each bin was taken to be at the center of the bin. In reality, the counts in each bin were probably not smoothly distributed in velocity space over the bin, but were weighted toward the part of the bin nearest the center of the peak of the velocity distribution. The "coarse" distribution would thus yield values for the density and temperature that were higher than the true values. A correction for that effect was accomplished by fitting contours to the coarse distribution, breaking each bin or pixel into subpixels, and then using the contours and the calibrated angular responses to distribute the counts among the subpixels. New contours were then computed and the process was continued until it converged. More details about this deconvolution of the angular data are given in the appendix of a paper by Neugebauer, M., et al., "Ion distributions in large magnetic holes in the fast solar wind", J. Geophys. Res.,106, 5635, 2001. This procedure generated the matrix of velocity distribution functions of protons and alpha-particles parallel and perpendicular to the simultaneously measured magnetic field. <_Description>Source: Master/CDFglobalAttributes/TEXT B. G. Goldstein, M. Neugebauer, A. Tenerani <_Acknowledgement>Source: Master/CDFglobalAttributes/Acknowledgement <_Rights> SPDX Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html https://spdx.org/licenses/ The Ulysses Solar Wind Observations Over the Poles of the Sun, SWOOPS, Instrument Web Page hosted at the Los Alamos National Laboratory, LANL https://swoops.lanl.gov/ The Ulysses SWOOPS Web Page, LANL <_Note>Source: InformationURL.json <_DOI>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/DOI.json <_AccessInformation>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/AccessInformation.json 1990-11-18T12:56:11Z 2009-06-30T15:38:12Z <_TemporalDescription>Generated from all.xml/@timerange_start and all.xml/@timerange_stop PT4M3S <_Cadence>Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/ulysses/plasma/swoops_cdaweb/alpha-distributions_swoops/1990/uy_alpha-distributions_swoops_19901118_v01.cdf. The most common cadence, 243000 [ms] = PT4M3S, occurred for 39.6467% of the 1526 timesteps. <_ObservedRegion>Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ObservedRegion.json <_ProcessingLevel>Processing level is not available in the master file; it should be there instead of, say, https://github.com/rweigel/cdawmeta-spase/blob/main/ProcessingLevel.json spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: David. J. McComas at Princeton/PPPL HTTPS from SPDF https://cdaweb.gsfc.nasa.gov/pub/data/ulysses/plasma/swoops_cdaweb/alpha-distributions_swoops In CDF via HTTP from CDAWeb uy_alpha-distributions_swoops_%Y%m%d_%Q.cdf %Y UY_ALPHA-DISTRIBUTIONS_SWOOPS CDF spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: David. J. McComas at Princeton/PPPL FTPS from SPDF ftps://cdaweb.gsfc.nasa.gov/pub/data/ulysses/plasma/swoops_cdaweb/alpha-distributions_swoops In CDF via HTTP from CDAWeb uy_alpha-distributions_swoops_%Y%m%d_%Q.cdf %Y UY_ALPHA-DISTRIBUTIONS_SWOOPS CDF spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: David. J. McComas at Princeton/PPPL CDAWeb Web Service https://cdaweb.gsfc.nasa.gov/WebServices/ Instructions for using web services to access this dataset an other other metadata and options for CDAWeb datasets. The ProductKey here corresponds to the query parameter 'dataset' in the tables at the AccessURL in a dataset-related request can be made. UY_ALPHA-DISTRIBUTIONS_SWOOPS CDF CSV GIF NetCDF PNG PS PDF XML x_Script.IDL x_Script.Python Text.ASCII x_WAV spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: David. J. McComas at Princeton/PPPL CDAWeb Web Service user interface https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?index=sp_phys&dataset=UY_ALPHA-DISTRIBUTIONS_SWOOPS UY_ALPHA-DISTRIBUTIONS_SWOOPS Web service user interface for this product. CDF GIF PDF Text.ASCII x_WAV spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb. Please also acknowledge the data producer: David. J. McComas at Princeton/PPPL CDAWeb Python Script https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/UY_ALPHA-DISTRIBUTIONS_SWOOPS/clientLibraryExample/ UY_ALPHA-DISTRIBUTIONS_SWOOPS Web service that generates a Python script to access this product. x_Script.IDL x_Script.Python spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/SSCWeb. Please also acknowledge the data producer: David. J. McComas at Princeton/PPPL 4D Orbit Viewer https://sscweb.gsfc.nasa.gov/4dorbit/?sc=UY_ALPHA-DISTRIBUTIONS_SWOOPS UY_ALPHA-DISTRIBUTIONS_SWOOPS Web Service to this product. HTML spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: David. J. McComas at Princeton/PPPL CDAWeb HAPI Server https://hapi-server.org/servers/#server=CDAWeb&dataset=UY_ALPHA-DISTRIBUTIONS_SWOOPS UY_ALPHA-DISTRIBUTIONS_SWOOPS Web Service to this product using the HAPI interface. CSV JSON Binary spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: David. J. McComas at Princeton/PPPL CDAWeb HAPI Script in Multiple Languages https://hapi-server.org/servers/#server=CDAWeb&dataset=UY_ALPHA-DISTRIBUTIONS_SWOOPS&return=script UY_ALPHA-DISTRIBUTIONS_SWOOPS Web Service user interface that generates scripts in IDL, Javascript, MATLAB, Python, Autoplot, curl, wget to access this product. See https://hapi-server.org/servers/api for the API. x_Script.IDL x_Script.Javascript x_Script.MATLAB x_Script.Python x_Script.Autoplot x_Script.curl x_Script.wget spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: David. J. McComas at Princeton/PPPL HAPI visualizations https://hapi-server.org/plot/?server=https://cdaweb.gsfc.nasa.gov/hapi&dataset=UY_ALPHA-DISTRIBUTIONS_SWOOPS&format=gallery UY_ALPHA-DISTRIBUTIONS_SWOOPS Web Service that generates plots. See https://hapi-server.org/plot/ for the API. PNG PDF SVG Ulysses (from all.xml/observatory/description/@short) SWOOPS (from all.xml/instrument/description/@short) Solar Physics (from Master/CDFglobalAttributes/Discipline) Heliospheric Physics (from Master/CDFglobalAttributes/Discipline) Ulysses (from Master/CDFglobalAttributes/Source_name) H2 (from Master/CDFglobalAttributes/Data_type) Solar Wind Plasma Distribution Function (from Master/CDFglobalAttributes/Data_type) SWOOPS (from all.xml/instrument/@ID) Jupiter Heliosphere.NearEarth Heliosphere.Inner Heliosphere.Outer Sun.Corona Heliosphere spase://SMWG/Instrument/Ulysses/Ephemeris spase://SMWG/Instrument/Ulysses/FGM spase://SMWG/Instrument/Ulysses/SWOOPS EnergeticParticles MagneticField ThermalPlasma Epoch Epoch CATDESC: 'Epoch'. Notes not in Master CDF: 'The units are the units in CDF files. For other web services, this variable is may be represented as a time string.' ms Scalar Temporal Heliographic latitude heliographicLatitude Master CDF CATDESC: 'Heliographic latitude'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' deg -1e+31 Heliocentric Distance heliocentricDistance Master CDF CATDESC: 'Heliocentric Distance'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' AU -1e+31 BR (RTN) BR Master CDF CATDESC: 'Magnetic field component BR in inertial RTN coordinates'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' nT -1e+31 BT (RTN) BT Master CDF CATDESC: 'Magnetic field component BT in inertial RTN coordinates'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' nT -1e+31 BN (RTN) BN Master CDF CATDESC: 'Magnetic field component BN in inertial RTN coordinates'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' nT -1e+31 Magnetic field magnitude B_MAG Master CDF CATDESC: 'Magnetic field magnitude'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' nT -1e+31 ABS(V) (RTN) V_MAG Master CDF CATDESC: 'Alpha particle speed in inertial RTN coordinates'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' km/s -1e+31 He+ distr. function Matrix Master CDF CATDESC: 'Log10 of the distribution function of alpha particles'. Master CDF VAR_NOTES: 'Log10 of the distribution function. The distribution function is a 50x25 matrix. If at a given time v_par and/or v_per have a smaller number of elements than 50 and 25, respectively, then the undefined array entries of v_par and/or v_per and of the distribution function are set to FILLVAL=-1.E30. '. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' s^3/(km^3-cm^3) -1e+31 50 25 speed parallel to the magnetic field v_par Master CDF CATDESC: 'v_par'. Master CDF VAR_NOTES: '50 element array. '. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' km/s -1e+31 50 velocity perpendicular to the magnetic field v_per Master CDF CATDESC: 'v_per'. Master CDF VAR_NOTES: '25 element array'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' km/s -1e+31 25 v_par index v_par_index Master CDF CATDESC: 'v_par index'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' -9 50 v_per index v_per_index Master CDF CATDESC: 'v_per index'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.' -9 25