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/ACE/MAG/L2/PT1H NASA NumericalData ACE Magnetic Field (MAG) Geocentric Solar Ecliptic, GSE, and Geocentric Solar Magnetospheric, GSM, Coordinates, Level 2 (H2), 1 h Data https://doi.org/10.48322/fh85-fj47 2025-12-04T13:28:24Z 2021-04-27T15:38:11 Only known prior ReleaseDate of the metadata 2022-08-19T12:34:56.789 Added DOI and PublicationInfo minted by JMW on 20220808, updated two InformationURL URLs, updated the RepositoryID, updated the SPDF MetadataContact Person to Robert M. Candey, metadata updated to SPASE 2.4.1, reviewed by LFB 20220819 2025-09-30T14:27:18Z Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB 2025-12-04T13:28:24Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB This Data Product contains Measurements from the ACE Magnetic Field Instrument (MAG). The Quality of ACE Level 2 Data is such that it is suitable for serious Scientific Study. However, to avoid Confusion and Misunderstanding, it is recommended that Users consult with the appropriate ACE Team Members before publishing Work derived from the Data. The ACE Team has worked hard to ensure that the Level 2 Data are free from Errors, but the Team cannot accept Responsibility for erroneous Data, or for Misunderstandings about how the Data may be used. This is especially true if the appropriate ACE Team Members are not consulted before Publication. At the very least, Preprints should be forwarded to the ACE Team before Publication. MAG References: http://www.srl.caltech.edu/ACE/. N.F. Ness, Please acknowledge the Principal Investigator, N.F. Ness, Bartol Research Institute. See the Rules of Use available from the ACE Science Center at http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html. Smith, C.W., and N.F. Ness 2022-01-01T00:00:00 Space Physics Data Facility spase://SMWG/Person/Norman.F.Ness PrincipalInvestigator spase://SMWG/Person/Charles.W.Smith DataProducer spase://SMWG/Person/Robert.M.Candey MetadataContact spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact spase://SMWG/Person/James.M.Weygand MetadataContact ACE Science Center Home Page for Level 2 Data Release Notes https://izw1.caltech.edu/ACE/ASC/level2/index.html ACE Level 2 Data Release Notes Home Page ACE Science Center Home Page for Level 2 Rules of Use https://izw1.caltech.edu/ACE/ASC/level2/policy_lvl2.html ACE Level 2 Rules of Use Home Page ACE Magnetic Field (MAG) Instrument Home Page at the University of New Hampshire http://www-ssg.sr.unh.edu/mag/ACE.html ACE MAG Instrument Home Page at UNH spase://VSPO/NumericalData/ACE/MAG/PT3600S spase://VSPO/NumericalData/P_ACE_HDR_MAG_1HR spase://VSPO/NumericalData/ACE/MAG/L2/PT1H spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb 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/ace/mag/level_2_cdaweb/mfi_h2/ Access to Data in CDF Format via ftp from SPDF HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/ace/mag/level_2_cdaweb/mfi_h2/ Access to Data in CDF Format via http from SPDF CDAWeb https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=AC_H2_MFI&index=sp_phys AC_H2_MFI Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb CDF None N.F. Ness, Please acknowledge the Principal Investigator, N.F. Ness, Bartol Research Institute. See the Rules of Use available from the ACE Science Center at http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html. Please acknowledge the Data Providers and CDAWeb when using these Data. spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb 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 CDAWeb HAPI Server https://cdaweb.gsfc.nasa.gov/hapi AC_H2_MFI Web Service to this product using the HAPI interface. CSV N.F. Ness, Please acknowledge the Principal Investigator, N.F. Ness, Bartol Research Institute. See the Rules of Use available from the ACE Science Center at http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html. Please acknowledge the Data Providers and CDAWeb when using these Data. Calibrated spase://SMWG/Instrument/ACE/Ephemeris spase://SMWG/Instrument/ACE/MAG Ephemeris MagneticField 1997-09-02T00:00:00.000 -P5M The Data become available about five Months after Observation PT1H Heliosphere Heliosphere.Inner Heliosphere.NearEarth Epoch Time Epoch Epoch Time This Parameter exhibits an increasing Monotonic Progression. PT1H ms 1.0e-3>s Epoch E14.8 6.2987652219904e+13 6.3745034619904e+13 LinearScale 01-Jan-1996 00:00:00.000 01-Jan-2020 00:00:00.000 -1.0e+31 Temporal Time PB5 Time Series defined by using: EPOCH Time_PB5 Time PB5, Time of Observation, Year, Day, and Milliseconds of Day This Parameter exhibits an increasing Monotonic Progression. PT1H LinearScale 3 Year 1 a 1997 2020 year 1997 2020 Day of Year (Jan 1 = Day 1) 2 d 1 366 day 1 366 Elapsed milliseconds of day 3 ms 0 86400 msec 0 86400 -2147483648 Temporal Magnetic Field Magnitude Time Series defined by using: EPOCH Magnitude Magnetic Field Magnitude PT1H nT 1.0e-9>T TimeSeries B F8.3 0.0 10.0 0.0 500.0 -1.0e+31 Magnitude Magnetic Magnetic Field Vector, GSE, Cartesian Coordinates Time Series defined by using: EPOCH BGSEc Magnetic Field Vector, Geocentric Solar Ecliptic, GSE, Cartesian Coordinates PT1H nT 1.0e-9>T Cartesian GSE TimeSeries F9.3 -25.0 25.0 3 Bx GSE 1 x_component By GSE 2 y_component Bz GSE 3 z_component -65534.0 65534.0 -1.0e+31 Vector Magnetic Magnetic Field Vector, GSM, Cartesian Coordinates Time Series defined by using: EPOCH BGSM Magnetic Field Vector, Geocentric Solar Magnetospheric, GSM, Cartesian Coordinates PT1H nT 1.0e-9>T Cartesian GSM TimeSeries E9.3 -25.0 25.0 LinearScale 3 Bx (GSM) 1 x_component By (GSM) 2 y_component Bz (GSM) 3 z_component -65534.0 65534.0 -1.0e+31 Vector Magnetic Data Quality Flag Time Series defined by using: EPOCH Q_FLAG Data Quality Flag Data Quality Flag: 0=Good, 1=Spacecraft Maneuver and a subsequent High-Nutation Time Interval of approximately 4 hr, 2=Bad Data/Missing Data PT1H TimeSeries Quality Flag I1 0 2 0 2 -2147483648 Other Spacecraft Position Vector, GSE, Cartesian Coordinates Time Series defined by using: EPOCH SC_pos_GSE Spacecraft Position Vector, Geocentric Solar Ecliptic, GSE, Cartesian Coordinates Average Type: standard PT1H km 1.0e3>m Cartesian GSE TimeSeries F9.1 -2.0e+06 2.0e+06 3 ACE X-GSE 1 x_component ACE Y-GSE 2 y_component ACE Z-GSE 3 z_component -2.0e+06 2.0e+06 -1.0e+31 Vector Positional Spacecraft Position Vector, GSM, Cartesian Coordinates Time Series defined by using: EPOCH SC_pos_GSM Spacecraft Position Vector, Geocentric Solar Magnetospheric, GSM, Cartesian Coordinates Average Type: standard PT1H km 1.0e3>m Cartesian GSM TimeSeries F9.1 -2.0e+06 2.0e+06 3 ACE X-GSM 1 x_component ACE Y-GSM 2 y_component ACE Z-GSM 3 z_component -2.0e+06 2.0e+06 -1.0e+31 Vector Positional