2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/Ulysses/GAS/Interstellar-Helium/PT24H NASA NumericalData Ulysses GAS Interstellar Helium Maps https://doi.org/10.48322/m0b0-fg03 2025-12-04T13:32:11Z 2020-07-07T21:15:41Z Only known prior ReleaseDate of the metadata 2025-11-14T16:02:57Z Added PublicationInfo. Added ResourceType and NamingAuthority. ZCB 2025-12-04T13:32:11Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB This Ulysses GAS experiment data set consists of pixel map data and image files for sky maps generated from GAS measurements in the mode primarily sensitive to neutral helium atoms from inflow of interstellar gas into the heliosphere. The accumulated counts and Ecliptic (spacecraft-centered) angle coordinates for each sky map pixel are given in the ascii files *.TXT. The positions of the Sun and the planets vary with time and with the position of the spacecraft along its trajectory, while the positions of stars remain fixed. The full images are provided in GIF (*.GIF files) and postscript (*.PS files) format, the GIF files being easily viewed on-line (see below) with an Internet web browser. The actual positions of Sun, Earth, and Jupiter are indicated by yellow, green and white dots, respectively. The area around the Sun is excluded from observation to avoid damaging intensities from direct sunlight. The files USER_GUIDE.TXT, FORMAT.TXT, and REFERENCE.TXT, respectively, give an overall description of the various datatypes, the record format for the DATA datatype, and a list of GAS-related publications. The users guide defines the nomenclature of the file names. Further details about the data and the experiment may be found in Witte et al., Astron. Astrophys. Suppl. Ser., 92, No. 2, 333-348, 1992 (NSSDC TRF # B40459-000A). Data analysis methods for interstellar helium are described in Banaszkiewicz et al., Astron. Astrophys. Suppl. Ser., 120, 587-602, 1996 (B45706-000A). Please acknowledge the Ulysses team and the National Space Science Data Center. Grun, Eberhard 2025-11-14T16:02:57Z Planetary Data System; Space Physics Data Facility; European Space Astronomy Centre spase://SMWG/Person/Manfred.Witte DataProducer spase://SMWG/Person/Eberhard.Grun PrincipalInvestigator NSSDC Master Catalog https://nssdc.gsfc.nasa.gov/nmc/dataset/display.action?id=SPHE-00413 spase://VSPO/NumericalData/Ulysses/GAS/IS_Helium spase://VSPO/NumericalData/Ulysses/GAS/Interstellar-Helium/PT24H spase://SMWG/Repository/NASA/GSFC/SPDF Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products FTPS from SPDF (not with most browsers) ftps://spdf.gsfc.nasa.gov/pub/data/ulysses/gas/is_helium/data/ Via ftp in ASCII from SPDF HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/ulysses/gas/is_helium/data/ In CDF via HTTP from SPDF Text spase://SMWG/Instrument/Ulysses/GAS Dust 1990-10-27T00:00:00 2007-11-25T23:59:59 PT24H Heliosphere.Outer Heliosphere.Remote1AU