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/SOHO/CELIAS/PM/PT5M NASA NumericalData SOHO Charge, Element, and Isotope Analysis System (CELIAS) Proton Monitor 5 Minute Solar Wind data 2025-12-04T13:31:28Z 2020-07-07T21:15:18Z Only known prior ReleaseDate of the metadata 2023-10-17T00:00:00Z Updated URLs, minor corrections, AK 20231017 2025-11-14T16:03:10Z Added PublicationInfo. 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 2025-12-04T13:31:28Z Added MetadataRightsList. Updated to 2.7.1. ZCB The Proton Monitor is a solar wind Energy per Charge (E/Q) analyzer of a new design, consisting of a three-box deflection system followed by a wedge-shaped MicroChannel Plate (MCP) assembly. The data are derived from sets of 6 rates (one for each voltage step of the PM deflection system) obtained every 30 seconds. The voltage steps are spaced logarithmically (about 60% step size) from about 0.3 to 3 kV. At a given voltage step the energy per charge dynamic range is slightly more than a factor of 2. The overall geometry factor of the PM is about 1.0 x 10^-4 cm^2. Please acknowledge the University of Maryland Space Physics Group Ipavich, Fred M. 2025-11-14T16:03:10Z University of Maryland, College Park; Space Physics Data Facility spase://SMWG/Person/Fred.M.Ipavich PrincipalInvestigator SOHO Celias Proton Monitor Home Page https://space.umd.edu/pm/ Site hosting instrument information, some data and plots for SOHO Celias PM spase://VHO/NumericalData/SOHO/CELIAS/PT5M spase://VSPO/NumericalData/SOHO/CELIAS/PT5M spase://NASA/NumericalData/SOHO/CELIAS/PT5M spase://SMWG/Repository/UMD Online Open Proton Monitor Data at UMD https://l1.umd.edu/ CELIAS Proton Monitor repository at UMD Text ASCII spase://SMWG/Instrument/SOHO/CELIAS spase://SMWG/Instrument/SOHO/Ephemeris ThermalPlasma Ephemeris 1996-01-20T20:17:30Z -P1M PT5M Heliosphere.NearEarth On rare occassions the spacecraft's roll angle is changed for brief periods, during which the derived flow direction will refer to a different plane. A list of such times is available at http://umtof.umd.edu/pm/roll.html. In addition, since SOHO is not a spinning spacecraft, the deflection system was designed to have a wide angular acceptance (+- 15 deg). For technical reasons this leads to an ambiguity between incident angle and incident energy/charge; this ambiguity was designed into the PM to match as closely as possible the behavior of the deflection system for the main MTOF sensor. It is not the energy/charge but rather the mass/charge that is needed for interpretation of the MTOF mass data. Year Field 1 Two digit year Temporal Month Field 2 String representation of month Temporal Day Field 3 Day of the Month Temporal Time Field 4 Colon seperated day of year, hour, minute and second (doy:HH:MM:SS) Temporal Proton Speed Field 5 Proton Speed km/s Proton Magnitude Velocity Proton Density Field 6 Proton number density Parameters are derived from a combination of fitting and moment techniques cm^-3 Proton Fit Moment NumberDensity Proton Thermal Speed Field 7 Most probable proton thermal speed Parameters are derived from a combination of fitting and moment techniques km/s Proton Scalar Moment Fit ThermalSpeed Proton arrival direction Field 8 Proton arrival direction in degrees from north/south with positive meaning from the south degrees Proton DirectionAngle.ElevationAngle Velocity Predicted Helium speed Field 9 Predicted (not measured) Helium speed Atom FlowSpeed 2 GSE X Field 10 GSE X Component of SOHO position vector based on predicted orbit files ( 1 Re = 6378 km ) Re 6.378e6>m Cartesian GSE Positional GSE Y Field 11 GSE Y Component of SOHO position vector based on predicted orbit files ( 1 Re = 6378 km ) Re 6.378e6>m Cartesian GSE Positional GSE Z Field 12 GSE Z Component of SOHO position vector based on predicted orbit files ( 1 Re = 6378 km ) Re 6.378e6>m Cartesian GSE Positional Heliocentric Range Field 13 Heliocentric Range of SOHO in 10^6 km millions of km (10^6 km) 1e9>m Positional Heliographic latitude Field 14 Heliographic latitude of SOHO degrees Positional Heliographic longitude Field 15 Heliographic longitude of SOHO degrees Positional Earth Carrington Rotation Number Field 16 Earth Carrington Rotation Number Temporal