2.2.9
spase://NASA/NumericalData/Vega1/MISCHA/PT2M30S
Vega 1 Magnetic Field Data (2.5 min)
2020-07-07T21:15:50Z
2.5-minute averaged magnetic field measurements from Vega 1. 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.
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spase://SMWG/Instrument/Vega1/MISCHA
MagneticField
Ephemeris
1984-12-23T18:57:07Z
1986-05-31T04:06:37Z
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