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Vega 2 Magnetic Field Data (2.5 min)

ResourceID
spase://NASA/NumericalData/Vega2/MISCHA/PT2M30S

Description

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).

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Details

Version:2.2.9

NumericalData

ResourceID
spase://NASA/NumericalData/Vega2/MISCHA/PT2M30S
ResourceHeader
ResourceName
Vega 2 Magnetic Field Data (2.5 min)
ReleaseDate
2020-07-07 21:15:50Z
Description

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).

Acknowledgement
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.
Contacts
RolePerson
1.GeneralContactspase://SMWG/Person/Valery.G.Petrov
2.DataProducerspase://SMWG/Person/Valery.A.Styazhkin
3.TechnicalContactspase://SMWG/Person/Natalia.E.Papitashvili
4.MetadataContactspase://SMWG/Person/Jan.Merka
PriorIDs
spase://VHO/NumericalData/Vega2/MISCHA/PT2M30S
spase://VSPO/NumericalData/Vega2/MISCHA/PT2M30S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

FTP access to Vega mission data at NSSDC.

AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via HTTP from SPDF

Format
Text.ASCII
Encoding
ASCII
InstrumentIDs
MeasurementType
MagneticField
MeasurementType
Ephemeris
TemporalDescription
TimeSpan
StartDate
1985-01-01 00:02:16Z
StopDate
1986-03-13 23:57:53Z
Cadence
PT2M30S
ObservedRegion
Heliosphere.Inner
ObservedRegion
Comet
Parameter #1
Name
Year
ParameterKey
Column 1
Description

Time of observation (year)

Support
SupportQuantity
Temporal
Parameter #2
Name
Month
ParameterKey
Column 2
Description

Time of observation (month of year)

Support
SupportQuantity
Temporal
Parameter #3
Name
Day
ParameterKey
Column 3
Description

Time of observation (day of month)

Support
SupportQuantity
Temporal
Parameter #4
Name
Hour
ParameterKey
Column 4
Description

Time of observation (hour of day)

Support
SupportQuantity
Temporal
Parameter #5
Name
Minute
ParameterKey
Column 5
Description

Time of observation (minute)

Support
SupportQuantity
Temporal
Parameter #6
Name
Second
ParameterKey
Column 6
Description

Time of observation (second)

Units
s
Support
SupportQuantity
Temporal
Parameter #7
Name
Br
ParameterKey
Column 7
Description

Magnetic field radial (+ to Sun) component

Caveats
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.
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SSE
FillValue
9999.9
Field
Qualifier
Component.I
Qualifier
Average
FieldQuantity
Magnetic
Parameter #8
Name
By
ParameterKey
Column 8
Description

Magnetic field By component

Caveats
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.
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SSE
FillValue
9999.9
Field
Qualifier
Component.J
Qualifier
Average
FieldQuantity
Magnetic
Parameter #9
Name
Bz
ParameterKey
Column 9
Description

Magnetic field Bz component

Caveats
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.
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SSE
FillValue
9999.9
Field
Qualifier
Component.K
Qualifier
Average
FieldQuantity
Magnetic
Parameter #10
Name
B
ParameterKey
Column 10
Description

Magnetic field magnitude in nT

Units
nT
UnitsConversion
1e-9>T
FillValue
9999.9
Field
Qualifier
Magnitude
Qualifier
Average
FieldQuantity
Magnetic
Parameter #11
Name
R
ParameterKey
Column 11
Description

Spacecraft radial distance from Sun in AU.

Units
AU
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
HGI
Support
Qualifier
Magnitude
SupportQuantity
Positional
Parameter #12
Name
Azimuth
ParameterKey
Column 12
Description

HGI spacecraft position azimuth, degrees.

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
HGI
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #13
Name
Elevation
ParameterKey
Column 13
Description

HGI Spacecraft position elevation, degrees.

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
HGI
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #14
Name
CSflag
ParameterKey
Column 14
Description

Coordinate system flag for magnetic field data. +-------------------------------------+ Flag Coordinate system -------------------------------------- 0 Spacecraft coordinates 1 Solar Ecliptic coordinates +-------------------------------------+

ValidMin
0
ValidMax
1
Support
SupportQuantity
Other