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/ISIS1/CEP/PT60S NASA NumericalData ISIS 1 Electron N and T data https://doi.org/10.48322/92xp-8f21 2026-07-21T12:05:30Z 2020-07-07T21:14:41Z Only known prior ReleaseDate of the metadata 2025-12-04T13:29:40Z Added MetadataRightsList and RightsList(s). Added ResourceType and NamingAuthority. Updated to 2.7.1. ZCB 2026-04-10T09:58:46Z Added new Contact(s). ZCB 2026-04-10T10:03:43Z Added PublicationInfo. ZCB 2026-04-30T16:34:06Z Added DOI. tlk 2026-06-26T13:18:12Z Add 'Z' to TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB 2026-07-21T12:05:30Z Added HelioData InformationURL. JWL ISIS 1 ionospheric electron density and temperature data at 1-5 min resolution Paghis, Irvine 2026-04-10T10:03:43Z Space Physics Data Facility spase://SMWG/Person/Irvine.Paghis PrincipalInvestigator spase://SMWG/Person/Dieter.K.Bilitza GeneralContact HelioData https://helio.data.nasa.gov/dataset/ISIS1_CEP_PT60S The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more. spase://VSPO/NumericalData/P_ISIS1_HDR_NETE spase://VSPO/NumericalData/ISIS1/CEP/PT60S 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/isis/cylindrical_electrostatic_probes_ascii/isis1/ HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/isis/cylindrical_electrostatic_probes_ascii/isis1/ In CDF via HTTP from SPDF Text CALIBRATED spase://SMWG/Instrument/ISIS1/CEP ThermalPlasma 1969-01-30T00:00:00Z 1971-06-01T00:00:00Z PT60S Earth.NearSurface.Ionosphere