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Helios 2 hourly merged magnetic field and plasma data

(2025). Helios 2 hourly merged magnetic field and plasma data [Data set]. Space Physics Data Facility.

ResourceID
spase://NASA/NumericalData/Helios2/MAGandPLS/PT1H

Description

This is an hourly resolution, merged magnetic field and plasma data set created at NSSDC for COHOWeb. Magnetic field vectors and plasma flow direction angles are given in RTN coordinates. Spacecraft position data are given in Heliographic inertial (HGI coordinates).

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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/MAGandPLS/PT1H
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
Helios 2 hourly merged magnetic field and plasma data
ReleaseDate
2025-12-04 13:29:21Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 15:38:11Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-09-09 12:34:56.789
Note
Revised ObservedRegions. JMW
RevisionEvent
ReleaseDate
2025-11-14 16:02:23Z
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 13:29:21Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
Description

This is an hourly resolution, merged magnetic field and plasma data set created at NSSDC for COHOWeb. Magnetic field vectors and plasma flow direction angles are given in RTN coordinates. Spacecraft position data are given in Heliographic inertial (HGI coordinates).

Acknowledgement
Please acknowledge N.F. Ness (P.I.) and F. Mariani for magnetic field data and H. Rosenbauer (P.I.) and R. Schwenn for plasma data, and NSSDC or GSFC-SPDF
PublicationInfo
Authors
Ness, Norman F.; Rosenbauer, Helmut R.; Mariani, Franco; Schwenn, Rainer
PublicationDate
2025-11-14 16:02:23Z
PublishedBy
Space Physics Data Facility
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/Norman.F.Ness
2.PrincipalInvestigatorspase://SMWG/Person/Helmut.R.Rosenbauer
3.CoInvestigatorspase://SMWG/Person/Franco.Mariani
4.CoInvestigatorspase://SMWG/Person/Rainer.Schwenn
5.GeneralContactspase://SMWG/Person/Natalia.E.Papitashvili
InformationURL
Name
Readme file at SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/helios/helios2/merged/he2mgd.txt
PriorIDs
spase://VHO/NumericalData/Helios2/MAGandPLS/PT1H
spase://VSPO/NumericalData/Helios2/MAGandPLS/PT1H
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
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
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/helios/helios2/merged/
Description

for annual files via ftp

AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/helios/helios2/merged/
Description

In CDF via HTTP from SPDF

AccessURL
Name
CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=HELIOS2_COHO1HR_MERGED_MAG_PLASMA&index=sp_phys
ProductKey
HELIOS2_COHO1HR_MERGED_MAG_PLASMA
Description

For CDAWeb subset,plot and list capabilities

AccessURL
Name
COHOWeb plots and lists
URL
https://omniweb.gsfc.nasa.gov/coho/form/helios2.html
Description

Helios 2-specific page for plots and lists

AccessURL
Name
COHOweb top page
URL
https://omniweb.gsfc.nasa.gov/coho/
Description

Plots, lists, scatter plots, regressions, distributions, means, etc.

Format
Text
DataExtent
Quantity
1.2
Units
MB
Per
P1Y
Acknowledgement
Please acknowledge N.F. Ness (P.I.) and F. Mariani for magnetic field data and H. Rosenbauer (P.I.) and R. Schwenn for plasma data, and NSSDC or GSFC-SPDF
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
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
CDAWeb HAPI Server
URL
https://cdaweb.gsfc.nasa.gov/hapi
Style
HAPI
ProductKey
HELIOS2_COHO1HR_MERGED_MAG_PLASMA
Description

Web Service to this product using the HAPI interface.

Format
CSV
Acknowledgement
Please acknowledge N.F. Ness (P.I.) and F. Mariani for magnetic field data and H. Rosenbauer (P.I.) and R. Schwenn for plasma data, and NSSDC or GSFC-SPDF
InstrumentIDs
spase://SMWG/Instrument/Helios2/E1
spase://SMWG/Instrument/Helios2/E3
MeasurementType
MagneticField
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
1976-01-17 00:00:00
StopDate
1980-03-04 00:00:00
Cadence
PT1H
ObservedRegion
Heliosphere.Inner
ObservedRegion
Heliosphere
ObservedRegion
Heliosphere.NearEarth
Parameter #1
Name
Year
ParameterKey
Column1
Description

Four digit Year

Cadence
PT1H
FillValue
999.9999
Support
SupportQuantity
Temporal
Parameter #2
Name
Day
ParameterKey
Column2
Description

Decimal Day of Year

Cadence
PT1H
FillValue
999.9999
Support
SupportQuantity
Temporal
Parameter #3
Name
Hour
ParameterKey
Column3
Description

Hour

Cadence
PT1H
FillValue
999.9999
Support
SupportQuantity
Temporal
Parameter #4
Name
Carrington Rotation Number
ParameterKey
Column4
Description

Carrington Rotation Number seen by an Earth based observer at the start of the data interval

Cadence
PT1H
FillValue
999.9999
Support
SupportQuantity
Temporal
Parameter #5
Name
H2 radial distance
ParameterKey
Column05
Description

Heliocentric radial distance of Helios 2 in AU

Cadence
PT1H
Units
AU
Support
SupportQuantity
Positional
Parameter #6
Name
H2 latitude
ParameterKey
Column06
Description

Heliographic Inertial elevation angle of Helios 2 in deg

Cadence
PT1H
Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
HGI
Support
SupportQuantity
Positional
Parameter #7
Name
H2 longitude
ParameterKey
Column07
Description

Heliographic Inertial azimuthal angle of Helios 2 in deg

Cadence
PT1H
Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
HGI
Support
SupportQuantity
Positional
Parameter #8
Name
ESS angle
ParameterKey
Column08
Description

Earth-Sun-Spacecraft separation angle

Cadence
PT1H
Units
deg
Support
SupportQuantity
Positional
Parameter #9
Name
Magnetic Field Vector, SSE
Description

Hourly averages of SSE (spacecraft-centric solar ecliptic) components of fine time scale magnetic field vectors

Cadence
PT1H
Units
nT
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SSE
Structure
Size
3
Description

X,Y,Z components

Element
Name
X component
Qualifier
Component.I
Index
1
ParameterKey
Column09
Element
Name
Y component
Qualifier
Component.J
Index
2
ParameterKey
Column10
Element
Name
Z component
Qualifier
Component.K
Index
3
ParameterKey
Column11
FillValue
99999.99
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #10
Name
Magnetic Field Vector, RTN
Description

Hourly averages of RTN components of fine time scale magnetic field vectors

Cadence
PT1H
Units
nT
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
RTN
Structure
Size
3
Description

R,T,N components

Element
Name
R component
Qualifier
Component.I
Index
1
ParameterKey
Column12
Element
Name
T component
Qualifier
Component.J
Index
2
ParameterKey
Column13
Element
Name
N component
Qualifier
Component.K
Index
3
ParameterKey
Column14
FillValue
99999.99
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #11
Name
Magnetic Field Magnitude
ParameterKey
Column15
Description

Hourly average of fine time scale magnetic field magnitudes

Cadence
PT1H
Units
nT
FillValue
99999.99
Field
Qualifier
Magnitude
FieldQuantity
Magnetic
Parameter #12
Name
Flow speed
ParameterKey
Column16
Description

Hourly averaged solar wind plasma flow speed

Cadence
PT1H
Units
km/s
FillValue
9999.9
Particle
ParticleType
Proton
Qualifier
Average
ParticleQuantity
FlowSpeed
Parameter #13
Name
Flow elevation angle
ParameterKey
Column17
Description

Hourly averaged solar wind plasma flow elevation angle

Cadence
PT1H
Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
RTN
FillValue
9999.9
Particle
ParticleType
Proton
Qualifier
DirectionAngle.ElevationAngle
ParticleQuantity
FlowVelocity
Parameter #14
Name
Flow azimuth angle
ParameterKey
Column18
Description

Hourly averaged solar wind plasma flow azimuthal angle

Cadence
PT1H
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
RTN
FillValue
9999.9
Particle
ParticleType
Proton
Qualifier
DirectionAngle.AzimuthAngle
ParticleQuantity
FlowVelocity
Parameter #15
Name
Density
ParameterKey
Column19
Description

Hourly averaged solar wind plasma density

Cadence
PT1H
Units
n/cc
FillValue
999.9
Particle
ParticleType
Proton
Qualifier
Average
ParticleQuantity
NumberDensity
Parameter #16
Name
Temperature
ParameterKey
Column20
Description

Hourly averaged solar wind plasma temperature (radial component)

Cadence
PT1H
Units
degK
FillValue
9999999.
Particle
ParticleType
Proton
Qualifier
Average
ParticleQuantity
Temperature