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Helios 2 Merged Plasma and Magnetic Field

Rosenbauer, Helmut R.; Neubauer, Fritz M. (2025). Helios 2 Merged Plasma and Magnetic Field [Data set]. Space Physics Data Facility. https://doi.org/10.48322/2zgw-qh23 .

Note: Proper references, including those in BibTex or other formats , should include the "Accessed on date" as shown above to identify the version of the resource being cited in a given publication.

ResourceID
spase://NASA/NumericalData/Helios2/Combined/PT40.5S

Description

Merged solar wind plasma and magnetic field measurements from the Helios 2 spacecraft. Variable time resolution (2-10 minutes) Calibrated science quality data.

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Details

Version:2.7.1

MetadataRightsList

Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
SPDX
RightsIdentifier
CC0-1.0
RightsURI
https://spdx.org/licenses/CC0-1.0.html
RightsName
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions

Version:2.7.1

NumericalData

ResourceID
spase://NASA/NumericalData/Helios2/Combined/PT40.5S
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
Helios 2 Merged Plasma and Magnetic Field
DOI
https://doi.org/10.48322/2zgw-qh23
ReleaseDate
2026-07-21 12:05:02Z
RevisionHistory
RevisionEvent
ReleaseDate
2020-07-07 21:14:35Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-11-14 16:16:45Z
Note
Added PublicationInfo. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB
RevisionEvent
ReleaseDate
2025-12-04 13:29:20Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-07-21 12:05:02Z
Note
Added HelioData InformationURL. JWL
Description

Merged solar wind plasma and magnetic field measurements from the Helios 2 spacecraft. Variable time resolution (2-10 minutes) Calibrated science quality data.

Acknowledgement
User will acknowledge the Helios plasma instrument PI Dr. Helmut Rosenbauer and the magnetometer PI Prof. Fritz M. Neubauer.
PublicationInfo
Authors
Rosenbauer, Helmut R.; Neubauer, Fritz M.
PublicationDate
2025-11-14 16:16:45Z
PublishedBy
Space Physics Data Facility
Contacts
Role Person StartDate StopDate Note
1. PrincipalInvestigator spase://SMWG/Person/Helmut.R.Rosenbauer
2. PrincipalInvestigator spase://SMWG/Person/Fritz.M.Neubauer
3. DataProducer spase://SMWG/Person/Rainer.Schwenn
4. DataProducer spase://SMWG/Person/D.Aaron.Roberts
InformationURL
Name
Max Planck Institute for Solar System Research Helios Project page
URL
http://www2.mps.mpg.de/de/projekte/helios/
Description

A website describing the Helios mission and its instruments

InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/Helios2_Combined_PT40.5S
Description

The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.

PriorIDs
spase://VHO/NumericalData/Helios2/Combined/PT40.5S
spase://VSPO/NumericalData/Helios2/Combined/PT40.5S
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/VHO-VMO
Availability
Online
AccessRights
Open
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
SPDX
RightsIdentifier
CC0-1.0
RightsURI
https://spdx.org/licenses/CC0-1.0.html
RightsName
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products
AccessURL
Name
Download of Helios 2 merged plasma and magnetic field data
URL
https://vho.nasa.gov/mission/helios2/
Description

Repository of the Helios 2 data

Format
Text
Encoding
ASCII
ProviderResourceName
Helios 2 Merged Plasma and Magnetic Field
ProviderVersion
1
InstrumentIDs
spase://SMWG/Instrument/Helios2/E2
spase://SMWG/Instrument/Helios2/E1
spase://SMWG/Instrument/Helios2/Ephemeris
MeasurementType
Ephemeris
MeasurementType
MagneticField
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
1976-01-17 01:21:36Z
StopDate
1980-03-08 17:43:50Z
Cadence
PT40.5S
ObservedRegion
Heliosphere.Inner
Caveats
Fundamental cadence of 40.5 sec with numerous gaps
Keywords
Magnetic field
Solar Wind Plasma
Parameter #1
Name
Year
ParameterKey
Field 1
Description

Year of the observation

Support
SupportQuantity
Temporal
Parameter #2
Name
Day
ParameterKey
Field 2
Description

Day of year of the observation

Support
SupportQuantity
Temporal
Parameter #3
Name
DecimalHour
ParameterKey
Field 3
Description

Decimal Hour of the observation

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

Integer Hour of the observation

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

Minute of the observation

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

Second of the observation

Support
SupportQuantity
Temporal
Parameter #7
Name
RadDist
ParameterKey
Field 7
Description

Heliocentric radial distance of the s/c from the Sun

Units
AU
UnitsConversion
1.495979e-11>m
Support
SupportQuantity
Positional
Parameter #8
Name
EarthSunSCAng
ParameterKey
Field 8
Description

Earth-Sun-S/C Angle

Units
degree
UnitsConversion
1.745329e-2rad
Support
SupportQuantity
Positional
Parameter #9
Name
CarrLong
ParameterKey
Field 9
Description

Carrington longitude of the s/c

Units
degree
UnitsConversion
1.745329e-2>rad
Support
SupportQuantity
Positional
Parameter #10
Name
CarrLat
ParameterKey
Field 10
Description

Carrington latitude of the s/c

Units
degree
UnitsConversion
1.745329e-2rad
Support
SupportQuantity
Positional
Parameter #11
Name
HGILong
ParameterKey
Field 11
Description

HGI Longitude of the s/c

Units
degree
UnitsConversion
1.745329e-2rad
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
HGI
Support
SupportQuantity
Positional
Parameter #12
Name
Br
ParameterKey
Field 12
Description

Br magnetic field component in RTN coordinates.

Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
RTN
Field
Qualifier
Component.I
FieldQuantity
Magnetic
Parameter #13
Name
Bt
ParameterKey
Field 13
Description

Bt magnetic field component in RTN coordinates.

Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
RTN
Field
Qualifier
Component.J
FieldQuantity
Magnetic
Parameter #14
Name
Bn
ParameterKey
Field 14
Description

Bn magnetic field component in RTN coordinates.

Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
RTN
Field
Qualifier
Component.K
FieldQuantity
Magnetic
Parameter #15
Name
Vp1R
ParameterKey
Field 15
Description

Proton velocity R component in RTN coordinates from the E1/I1A sensor

Caveats
These RTN coordinates assumed the spacecraft to be in the ecliptic
Units
km/s
UnitsConversion
1.0e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
RTN
Particle
ParticleType
Proton
Qualifier
Component.I
ParticleQuantity
Velocity
Parameter #16
Name
Vp1T
ParameterKey
Field 16
Description

Proton velocity T component in RTN coordinates from the E1/I1A sensor

Caveats
These RTN coordinates assumed the spacecraft to be in the ecliptic
Units
km/s
UnitsConversion
1.0e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
RTN
Particle
ParticleType
Proton
Qualifier
Component.J
ParticleQuantity
Velocity
Parameter #17
Name
Vp1N
ParameterKey
Field 17
Description

Proton velocity N component in RTN coordinates from the E1/I1A sensor

Caveats
These RTN coordinates assumed the spacecraft to be in the ecliptic
Units
km/s
UnitsConversion
1.0e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
RTN
Particle
ParticleType
Proton
Qualifier
Component.K
ParticleQuantity
Velocity
Parameter #18
Name
CarrRot
ParameterKey
Field 18
Description

Carrington rotation number of the s/c

Support
SupportQuantity
Positional
Parameter #19
Name
Np1
ParameterKey
Field 19
Description

Proton number desnity from the E1/I1A sensor

Units
cm^-3
UnitsConversion
1.0e-6>m^-3
Particle
ParticleType
Proton
Qualifier
Moment
ParticleQuantity
NumberDensity
Parameter #20
Name
Vp1
ParameterKey
Field 20
Description

Proton speed (scalar) from the E1/I1A sensor

Units
km/s
UnitsConversion
1.0e3>m/s
Particle
ParticleType
Proton
Qualifier
Magnitude
ParticleQuantity
Velocity
Parameter #21
Name
Tp1
ParameterKey
Field 21
Description

Proton scalar temperature from the E1/I1A sensor

Units
K
Particle
ParticleType
Proton
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #22
Name
Vp1az
ParameterKey
Field 22
Description

Proton velocity azimuth flow angle in SSE coordinates from the E1/I1A sensor

Units
deg
UnitsConversion
1.745329e-2>rad
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
SSE
Particle
ParticleType
Proton
Qualifier
DirectionAngle.AzimuthAngle
ParticleQuantity
Velocity
Parameter #23
Name
Vp1el
ParameterKey
Field 23
Description

Proton velocity elevational flow angle in SSE coordinates from the E1/I1A sensor

Units
deg
UnitsConversion
1.745329e-2>rad
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
SSE
Particle
ParticleType
Proton
Qualifier
DirectionAngle.ElevationAngle
ParticleQuantity
Velocity
Parameter #24
Name
Bx
ParameterKey
Field 24
Description

Bx magnetic field component in SSE coordinates.

Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SSE
Field
Qualifier
Component.I
FieldQuantity
Magnetic
Parameter #25
Name
By
ParameterKey
Field 25
Description

By magnetic field component in SSE coordinates.

Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SSE
Field
Qualifier
Component.J
FieldQuantity
Magnetic
Parameter #26
Name
Bz
ParameterKey
Field 26
Description

Bz magnetic field component in SSE coordinates.

Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SSE
Field
Qualifier
Component.K
FieldQuantity
Magnetic
Parameter #27
Name
sBx
ParameterKey
Field 27
Description

One standard deviation of Bx magnetic field component in SSE coordinates.

Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SSE
Field
Qualifier
Component.I
Qualifier
StandardDeviation
FieldQuantity
Magnetic
Parameter #28
Name
sBy
ParameterKey
Field 28
Description

One standrd deviation of By magnetic field component in SSE coordinates.

Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SSE
Field
Qualifier
Component.J
Qualifier
StandardDeviation
FieldQuantity
Magnetic
Parameter #29
Name
sBz
ParameterKey
Field 29
Description

One standard deviation of Bz magnetic field component in SSE coordinates.

Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SSE
Field
Qualifier
Component.K
Qualifier
StandardDeviation
FieldQuantity
Magnetic
Parameter #30
Name
Na1
ParameterKey
Field 30
Description

Alpha number desnity from the E1/I1A sensor

Units
cm^-3
UnitsConversion
1.0e-6>m^-3
Particle
ParticleType
AlphaParticle
Qualifier
Moment
ParticleQuantity
NumberDensity
Parameter #31
Name
Va1
ParameterKey
Field 31
Description

Alpha speed (scalar) from the E1/I1A sensor

Units
km/s
UnitsConversion
1.0e3>m/s
Particle
ParticleType
AlphaParticle
Qualifier
Magnitude
ParticleQuantity
Velocity
Parameter #32
Name
Ta1
ParameterKey
Field 32
Description

Alpha scalar temperature from the E1/I1A sensor

Units
K
Particle
ParticleType
AlphaParticle
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #33
Name
Np2
ParameterKey
Field 33
Description

Proton number desnity from the E1/I1B sensor

Units
cm^-3
UnitsConversion
1.0e-6>m^-3
Particle
ParticleType
Proton
Qualifier
Moment
ParticleQuantity
NumberDensity
Parameter #34
Name
Vp2
ParameterKey
Field 34
Description

Proton speed (scalar) from the E1/I1B sensor

Units
km/s
UnitsConversion
1.0e3>m/s
Particle
ParticleType
Proton
Qualifier
Magnitude
ParticleQuantity
Velocity