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Vega 2 solar wind parameters (20-min)

ResourceID
spase://NASA/NumericalData/Vega2/PLASMAG/PT20M

Description

This data set is a 20-min-resolution collection of solar wind plasma parameters from the interplanetary phases of the Soviet Vega 2 mission to Comet Halley. The data consist of proton flow speeds, densities and temperatures determined by fitting counts-vs-energy data measured on the sunward-looking electrostatic analyzer to a convecting Maxwellian. There are actually two sets of parameters, one ("linear") obtained by minimizing the sum of squares of measured and modelled counts and the other ("log") used logs of counts rather than counts themselves. Also included are numbers of energy intervals used in the linear and log determinations less than and greater than the spectral peaks. The data are at 20-min resolution because the during cruise phase only one or two 10-sec spectra were determined every 20 minutes. Further, the data have long gaps between the first and last days of coverage. The major data gaps are +---------------------------------------------------------------+ Vega 1: Vega 2: ----------------------------------------------------------------+ 85/04/20 - 85/07/23 85/04/16 - 85/07/24 85/12/21 - 86/01/05 85/09/27 - 85/11/27 86/04/29 - 86/08/04 85/12/03 - 86/02/20 86/02/23 - 86/03/06 +----------------------------------------------------------------+ Discussions of this investigation are found in Gringauz et al (Nature, v321, p282, 1986), Galeev et al (JGR, v93, p7527, 1988) and references therein.

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Details

Version:2.2.9

NumericalData

ResourceID
spase://NASA/NumericalData/Vega2/PLASMAG/PT20M
ResourceHeader
ResourceName
Vega 2 solar wind parameters (20-min)
ReleaseDate
2020-07-07 21:15:50Z
Description

This data set is a 20-min-resolution collection of solar wind plasma parameters from the interplanetary phases of the Soviet Vega 2 mission to Comet Halley. The data consist of proton flow speeds, densities and temperatures determined by fitting counts-vs-energy data measured on the sunward-looking electrostatic analyzer to a convecting Maxwellian. There are actually two sets of parameters, one ("linear") obtained by minimizing the sum of squares of measured and modelled counts and the other ("log") used logs of counts rather than counts themselves. Also included are numbers of energy intervals used in the linear and log determinations less than and greater than the spectral peaks. The data are at 20-min resolution because the during cruise phase only one or two 10-sec spectra were determined every 20 minutes. Further, the data have long gaps between the first and last days of coverage. The major data gaps are +---------------------------------------------------------------+ Vega 1: Vega 2: ----------------------------------------------------------------+ 85/04/20 - 85/07/23 85/04/16 - 85/07/24 85/12/21 - 86/01/05 85/09/27 - 85/11/27 86/04/29 - 86/08/04 85/12/03 - 86/02/20 86/02/23 - 86/03/06 +----------------------------------------------------------------+ Discussions of this investigation are found in Gringauz et al (Nature, v321, p282, 1986), Galeev et al (JGR, v93, p7527, 1988) and references therein.

Acknowledgement
Dr. M. Verigin of the Space Research Institute in Moscow.
Contacts
RolePerson
1.CoInvestigatorspase://SMWG/Person/Mikhail.I.Verigin
2.TechnicalContactspase://SMWG/Person/Natalia.E.Papitashvili
3.MetadataContactspase://SMWG/Person/Jan.Merka
PriorIDs
spase://VHO/NumericalData/Vega2/PLASMAG/PT20M
spase://VSPO/NumericalData/Vega2/PLASMAG/PT20M
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
Acknowledgement
The National Space Science Data Center(NSSDC), Space Physics Data Facility(SPDF).
InstrumentIDs
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
1985-03-09 04:46:26Z
StopDate
1986-10-04 06:13:32Z
Cadence
PT20M
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
ID
ParameterKey
Column 7
Description

Spacecraft ID: * 1 = Vega 1 * 2 = Vega 2

ValidMin
1
ValidMax
2
Support
SupportQuantity
Other
Parameter #8
Name
Vp (lin)
ParameterKey
Column 8
Description

Proton speed (km/s), linear fit.

Units
km/s
UnitsConversion
1e3>m/s
FillValue
9999.90
Particle
ParticleType
Proton
Qualifier
Fit
Qualifier
Magnitude
ParticleQuantity
Velocity
AtomicNumber
1
EnergyRange
Low
50
High
25000
Units
eV
Parameter #9
Name
Vp (log)
ParameterKey
Column 9
Description

Proton speed (km/s), log fit.

Units
km/s
UnitsConversion
1e3>m/s
FillValue
9999.90
Particle
ParticleType
Proton
Qualifier
Fit
Qualifier
Magnitude
ParticleQuantity
Velocity
AtomicNumber
1
EnergyRange
Low
50
High
25000
Units
eV
Parameter #10
Name
Np (lin)
ParameterKey
Column 10
Description

Proton density (cm^-3), linear fit

Units
cm^-3
UnitsConversion
1e-6>m^-3
FillValue
999.990
Particle
ParticleType
Proton
Qualifier
Fit
ParticleQuantity
NumberDensity
AtomicNumber
1
EnergyRange
Low
50
High
25000
Units
eV
Parameter #11
Name
Np (log)
ParameterKey
Column 11
Description

Proton density (cm^-3), log fit

Units
cm^-3
UnitsConversion
1e-6>m^-3
FillValue
999.990
Particle
ParticleType
Proton
Qualifier
Fit
ParticleQuantity
NumberDensity
AtomicNumber
1
EnergyRange
Low
50
High
25000
Units
eV
Parameter #12
Name
Tp (lin)
ParameterKey
Column 12
Description

Proton temperature (K), linear fit

Units
K
FillValue
0.1E35
Particle
ParticleType
Proton
Qualifier
Fit
ParticleQuantity
Temperature
AtomicNumber
1
EnergyRange
Low
50
High
25000
Units
eV
Parameter #13
Name
Tp (log)
ParameterKey
Column 13
Description

Proton temperature (K), log fit

Units
K
FillValue
0.1E35
Particle
ParticleType
Proton
Qualifier
Fit
ParticleQuantity
Temperature
AtomicNumber
1
EnergyRange
Low
50
High
25000
Units
eV
Parameter #14
Name
Code
ParameterKey
Column 14
Description

4-digit number abcd that codes the number of ion energy intervals used in lin (a+b+1) or log (c+d+1) maxwellian fitting procedures. * a,c - number of intervals used with energies less than energy of ion spectra maximum. * b,d - number of intervals used with energies more than energy of ion spectra maximum.

Support
SupportQuantity
Other