2.0.0 spase://VHO/NumericalData/Vega2/MISCHA/PT2M30S Vega 2 Magnetic Field Data (2.5 min) 2009-05-20T19:08:29Z 2.5-minute averaged magnetic field measurements from Vega 2. During the cruise phase from Earth to Venus (12/84-06/85) both Vega-1 and Vega-2 spacecraft had one-axis orientation, i.e. the spacecraft X axis was maintained sunward-pointing, while the spacecraft Y and Z axes rotated about the X axis. The spin phase of this rotation was not known, therefore the directions of By and Bz components are unknown. Magnetometer data for this period are presented in spacecraft coordinates as Br (directed radially from spacecraft to the Sun), Bysc, Bzsc. From the providers: "It is proposed to use for analysis of the interplanetary magnetic field during this period the Br component and the total B=sqrt(Bxsc^2+Bysc^2+Bzsc^2). Bysc and Bzsc components are included in the data, but keep in mind that the orientation of these axes is unknown. It can be considered as fixed during periods up to a few hours, so the data can be used to look for IMF discontinues and IMF orientation variations." After Venus flybys (June, 11-15, 1985) up to Comet Halley (March, 6 and 9, 1986) and sometimes later Vega-1 and Vega-2 had three-axis stabilized orientations. After-Venus magnetic field data are presented in spacecraft-centered solar ecliptic (SE) coordinate system as Br, Bzse, Byse, B, where Br is directed from the spacecraft to the Sun, Bzse is directed along Bz axes of the Solar Ecliptic system (to ecliptic pole), Byse completes the right handed set and B=sqrt(Br^2+By^2+Bz^2). Use of these data in publications should be accompanied by acknowledgements of the National Space Science Data Center(NSSDC), Space Physics Data Facility(SPDF) and IZMIRAN at Moscow. spase://SMWG/Person/Valery.G.Petrov GeneralContact spase://SMWG/Person/Valery.A.Styazhkin DataProducer spase://SMWG/Person/Natalia.E.Papitashvili TechnicalContact spase://SMWG/Person/Jan.Merka MetadataContact spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SPDF FTP area ftp://spdf.gsfc.nasa.gov/pub/data/zzz_old/vega_data_from_nssdc/mag/ FTP access to Vega mission data at NSSDC. SPDF HTTP area http://spdf.gsfc.nasa.gov/pub/data/zzz_old/vega_data_from_nssdc/mag/ In CDF via HTTP from SPDF Text.ASCII ASCII spase://SMWG/Instrument/Vega2/MISCHA MagneticField Ephemeris 1985-01-01T00:02:16Z 1986-03-13T23:57:53Z PT2M30S Heliosphere.Inner Comet Year Column 1 Time of observation (year) Temporal Month Column 2 Time of observation (month of year) Temporal Day Column 3 Time of observation (day of month) Temporal Hour Column 4 Time of observation (hour of day) Temporal Minute Column 5 Time of observation (minute) Temporal Second Column 6 Time of observation (second) s Temporal Br Column 7 Magnetic field radial (+ to Sun) component Magnetic field data are presented in spacecraft coordinates (SC) (before the Venus flyby) or in spacecraft-centered solar ecliptic (SE) coordinate system (after the Venus flyby). In both cases the Br(=Bx) component points towards Sun. See also the CSflag parameter. nT 1e-9>T Cartesian SSE 9999.9 Component.I Average Magnetic By Column 8 Magnetic field By component During the cruise phase from Earth to Venus (12/84-06/85) both Vega-1 and Vega-2 spacecraft had one-axis orientation, i.e. the spacecraft X axis was maintained sunward-pointing, while the spacecraft Y and Z axes rotated about the X axis. The spin phase of this rotation was not known, therefore the directions of By and Bz components are unknown. After-Venus magnetic field data are presented in spacecraft-centered solar ecliptic (SE) coordinate system as Br, Bzse, Byse, B, where Br is directed from the spacecraft to the Sun, Bzse is directed along Bz axes of the Solar Ecliptic system (to ecliptic pole), Byse completes the right handed set and B=sqrt(Br^2+By^2+Bz^2). See also the CSflag parameter. nT 1e-9>T Cartesian SSE 9999.9 Component.J Average Magnetic Bz Column 9 Magnetic field Bz component During the cruise phase from Earth to Venus (12/84-06/85) both Vega-1 and Vega-2 spacecraft had one-axis orientation, i.e. the spacecraft X axis was maintained sunward-pointing, while the spacecraft Y and Z axes rotated about the X axis. The spin phase of this rotation was not known, therefore the directions of By and Bz components are unknown. After-Venus magnetic field data are presented in spacecraft-centered solar ecliptic (SE) coordinate system as Br, Bzse, Byse, B, where Br is directed from the spacecraft to the Sun, Bzse is directed along Bz axes of the Solar Ecliptic system (to ecliptic pole), Byse completes the right handed set and B=sqrt(Br^2+By^2+Bz^2). See also the CSflag parameter. nT 1e-9>T Cartesian SSE 9999.9 Component.K Average Magnetic B Column 10 Magnetic field magnitude in nT nT 1e-9>T 9999.9 Magnitude Average Magnetic R Column 11 Spacecraft radial distance from Sun in AU. AU Spherical HGI Magnitude Positional Azimuth Column 12 HGI spacecraft position azimuth, degrees. deg Spherical HGI DirectionAngle.AzimuthAngle Positional Elevation Column 13 HGI Spacecraft position elevation, degrees. deg Spherical HGI DirectionAngle.ElevationAngle Positional CSflag Column 14 Coordinate system flag for magnetic field data. +-------------------------------------+ | Flag | Coordinate system | |--------------------------------------| | 0 | Spacecraft coordinates | | 1 | Solar Ecliptic coordinates | +-------------------------------------+ 0 1 Other