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Helios 1 E3 Magnetometer (Ness et al.) 1-hr Data

ResourceID
spase://NASA/NumericalData/Helios1/E3/PT1H

Description

Task of the HELIOS mission was the exploration of the inner heliosphere, inside the Earth's orbit to 0.3 AU. The Rome-GSFC magnetic field experiment has been a joint venture of an italian group (University of Rome and CNR/Istituto Fisica Spazio Interplanetario, Frascati) and an american group of NASA/Goddard Space Fligth Center, under the responsibility of F. Mariani and N.F.Ness, respectively. A description of the experiment can be found in the NASA-GSFC report X-692-75-112 (1975), by C. Scearce et al. The instrument is a dual configuration of two tri-axial fluxgate magnetometers operating at four different sensitivities (from 0.84 to 0.03 nT). The time resolution, depending the operation mode, telemetry format, and bit rate, for most cases varied from 0.07 to 1.5 seconds. This data set contains hour-averaged magnetic field vectors from the the Ness/Mariani experiment on Helios 1 [or 2]. Each record contains time, magnetic field intensity and cartesian components in spacecraft-centered solar ecliptic coordinates, standard deviations, numbers of fine-scale points in the average, and an instrument mode indicator. It should be noted that the "average" mode, which was used a minority of the time and involved on-board averaging, may have incorrectly handled range changes caused by occasional significant changes in ambient field intensity. The data set had not been filtered for this effect upon delivery to NSSDC. The data files are named either HE1MGA.asc, for one file covering the entire 1974 - 1981 period, or HE1MGAyy.asc, for one year intervals of data.

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Details

Version:2.2.9

NumericalData

ResourceID
spase://NASA/NumericalData/Helios1/E3/PT1H
ResourceHeader
ResourceName
Helios 1 E3 Magnetometer (Ness et al.) 1-hr Data
ReleaseDate
2021-03-11 18:39:11Z
Description

Task of the HELIOS mission was the exploration of the inner heliosphere, inside the Earth's orbit to 0.3 AU. The Rome-GSFC magnetic field experiment has been a joint venture of an italian group (University of Rome and CNR/Istituto Fisica Spazio Interplanetario, Frascati) and an american group of NASA/Goddard Space Fligth Center, under the responsibility of F. Mariani and N.F.Ness, respectively. A description of the experiment can be found in the NASA-GSFC report X-692-75-112 (1975), by C. Scearce et al. The instrument is a dual configuration of two tri-axial fluxgate magnetometers operating at four different sensitivities (from 0.84 to 0.03 nT). The time resolution, depending the operation mode, telemetry format, and bit rate, for most cases varied from 0.07 to 1.5 seconds. This data set contains hour-averaged magnetic field vectors from the the Ness/Mariani experiment on Helios 1 [or 2]. Each record contains time, magnetic field intensity and cartesian components in spacecraft-centered solar ecliptic coordinates, standard deviations, numbers of fine-scale points in the average, and an instrument mode indicator. It should be noted that the "average" mode, which was used a minority of the time and involved on-board averaging, may have incorrectly handled range changes caused by occasional significant changes in ambient field intensity. The data set had not been filtered for this effect upon delivery to NSSDC. The data files are named either HE1MGA.asc, for one file covering the entire 1974 - 1981 period, or HE1MGAyy.asc, for one year intervals of data.

Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/Norman.F.Ness
2.CoInvestigatorspase://SMWG/Person/Franco.Mariani
InformationURL
InformationURL
Name
Data set page at SPDF
URL
Description

Data set page at SPDF

PriorIDs
spase://VHO/NumericalData/Helios1/E3/PT1H
spase://VSPO/NumericalData/Helios1/E3/PT1H
spase://VSPO/NumericalData/P_HELIOS1_HDR_E3_MAG_1HR
spase://VSPO/NumericalData/Helios1/E3/PT1H
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

In ASCII via FTP from SPDF

AccessURL
Name
HTTPS from SPDF
URL
Description

In ASCII via HTTP from SPDF

Format
Text.ASCII
InstrumentIDs
MeasurementType
MagneticField
TemporalDescription
TimeSpan
StartDate
1974-12-15 00:00:00Z
StopDate
1981-06-16 23:59:59Z
Cadence
PT1H
ObservedRegion
Heliosphere.Inner
Parameter #1
Name
Helios number
ParameterKey
Column_1
Description

Number of the Helios spacecraft (1 or 2)

Support
SupportQuantity
Other
Parameter #2
Name
Year
ParameterKey
Column_2
Description

Two digit year

Support
SupportQuantity
Temporal
Parameter #3
Name
Day of Year
ParameterKey
Column_3
Description

Day of year (1=jan 1st)

Support
SupportQuantity
Temporal
Parameter #4
Name
Hour
ParameterKey
Column_4
Description

hour of data point

Support
SupportQuantity
Temporal
Parameter #5
Name
Bxse
ParameterKey
Column_5
Description

X Component of the magnetic field in SE Coordinates

CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SE
Field
Qualifier
Component.I
FieldQuantity
Magnetic
Parameter #6
Name
Byse
ParameterKey
Column_6
Description

Y Component of the magnetic field in SE Coordinates

CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SE
Field
Qualifier
Component.J
FieldQuantity
Magnetic
Parameter #7
Name
Bzse
ParameterKey
Column_7
Description

Z Component of the magnetic field in SE Coordinates

CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SE
Field
Qualifier
Component.K
FieldQuantity
Magnetic
Parameter #8
Name
B
ParameterKey
Column_8
Description

Field magnitude average

CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SE
Field
Qualifier
Magnitude
FieldQuantity
Magnetic
Parameter #9
Name
Standard Deviation in Field Vector
ParameterKey
Column_9
Description

sqrt(StD(Bx)2+StD(By)2+StD(Bz)**2) where StD=standard deviation

CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SE
Field
Qualifier
StandardDeviation
FieldQuantity
Magnetic
Parameter #10
Name
Standard Deviation of Field Magnitude
ParameterKey
Column_10
Description

Standard deviation of Field Magnitude

CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SE
Field
Qualifier
StandardDeviation
Qualifier
Magnitude
FieldQuantity
Magnetic
Parameter #11
Name
N
ParameterKey
Column_11
Description

Number of 6-sec averages in the hourly average

Support
SupportQuantity
Other
Parameter #12
Name
N
ParameterKey
Column_12
Description

Mode: 0=detailed, 1=average

Support
SupportQuantity
Other