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Data Access
FTPBrowser
Multi-Source Spectral Plot
FTPS from SPDF (not with most browsers)
HTTPS from SPDF
Pioneer 11 Cosmic-Ray Telescope (CRT) 6-hr fluxes and rates
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document.write(authors);
(2025).
Pioneer 11 Cosmic-Ray Telescope (CRT) 6-hr fluxes and rates.
[Data set].
Space Physics Data Facility.
https://doi.org/10.48322/ynsz-4e70. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/Pioneer11/CRT/PT6H
Description
This data set has eight 6-hour fluxes (3.45-5.15, 30.55-56.47 and 120.7-227.3 MeV protons, 3.44-4.97, 10.03-21.7, 30.67-56.7 and 112.7-413 MeV/n alpha particles, and 2-6 MeV electrons), 28 count rates, and Poisson uncertainties in the fluxes and rates, as determined from the Cosmic Ray Telescope (CRT) on the Pioneer 11 spacecraft. Data are in annual files with consistent end-of-record marks. Spacecraft position data are not given in the data records but are accessible from Helioweb at http://cohoweb.gsfc.nasa.gov/helios/heli.html
Metadata Rights
CC0-1.0:
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license.
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Details
Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/Pioneer11/CRT/PT6H
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
Pioneer 11 Cosmic-Ray Telescope (CRT) 6-hr fluxes and rates
DOI
https://doi.org/10.48322/ynsz-4e70
ReleaseDate
2026-07-21 12:06:28Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-03-11 18:39:11Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-11-14 16:02:53Z
Note
Added PublicationInfo. Added ResourceType and NamingAuthority. ZCB
RevisionEvent
ReleaseDate
2025-12-04 13:30:55Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-06-26 13:26:11Z
Note
Add 'Z' to TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB
RevisionEvent
ReleaseDate
2026-07-21 12:06:28Z
Note
Added HelioData InformationURL. JWL
Description
This data set has eight 6-hour fluxes (3.45-5.15, 30.55-56.47 and 120.7-227.3 MeV protons, 3.44-4.97, 10.03-21.7, 30.67-56.7 and 112.7-413 MeV/n alpha particles, and 2-6 MeV electrons), 28 count rates, and Poisson uncertainties in the fluxes and rates, as determined from the Cosmic Ray Telescope (CRT) on the Pioneer 11 spacecraft. Data are in annual files with consistent end-of-record marks. Spacecraft position data are not given in the data records but are accessible from Helioweb at http://cohoweb.gsfc.nasa.gov/helios/heli.html
Acknowledgement
the Principal Investigator, Frank B. McDonald
PublicationInfo
Authors
McDonald, Frank B.
PublicationDate
2025-11-14 16:02:53Z
PublishedBy
Space Physics Data Facility
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Frank.B.McDonald
2.
GeneralContact
spase://SMWG/Person/Nand.Lal
InformationURL
Name
Voldesc.sfdu
URL
https://spdf.gsfc.nasa.gov/pub/data/pioneer/pioneer11/particle/crt/ip_6hour_ascii/voldesc_v02.sfdu
InformationURL
Name
Format.sfdu
URL
https://spdf.gsfc.nasa.gov/pub/data/pioneer/pioneer11/particle/crt/ip_6hour_ascii/p11crt_format.sfdu
InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/Pioneer11_CRT_PT6H
Description
The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.
PriorIDs
spase://VEPO/NumericalData/Pioneer11/CRT/PT6H
spase://VSPO/NumericalData/Pioneer11/CRT/PT6H
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
FTPBrowser
URL
https://omniweb.gsfc.nasa.gov/ftpbrowser/p11_part_crt_6h.html
Description
For display and retrieval of parameter subsets
AccessURL
Name
Multi-Source Spectral Plot
URL
https://omniweb.gsfc.nasa.gov/ftpbrowser/flux_spectr_m.html
Description
Multi-source spectral plots (MSSP) of energetic particle fluxes for Z less than or equal to 2.
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/pioneer/pioneer11/particle/crt/ip_6hour_ascii/
Description
For ftp downloading of annual files
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/pioneer/pioneer11/particle/crt/ip_6hour_ascii/
Description
In CDF via HTTP from SPDF
Format
Text
DataExtent
Quantity
1.5
Units
MB
Per
P1Y
Acknowledgement
the Principal Investigator, Frank B. McDonald, and FTPBrowser at SPDF
ProcessingLevel
Calibrated
InstrumentIDs
spase://SMWG/Instrument/Pioneer11/CRT
MeasurementType
EnergeticParticles
TemporalDescription
TimeSpan
StartDate
1973-04-02 00:00:00Z
StopDate
1994-12-31 00:00:00Z
Cadence
PT6H
ObservedRegion
Heliosphere.Outer
Parameter #1
Name
Proton Flux 3.45-5.15 MeV
Description
This flux is obtained from LET-I and is derived from pulse height data using R11A for normalization
Units
particles/(cm**2 sec ster MeV)
Structure
Size
1
FillValue
0.000000e+00
Particle
ParticleType
Proton
Qualifier
Average
ParticleQuantity
NumberFlux
EnergyRange
Low
3.45
High
5.15
Units
MeV
Parameter #2
Name
Proton Flux 30.55-56.47 MeV
Description
This flux is obtained from HET and is derived from pulse height data using R1 for normalization
Units
particles/(cm**2 sec ster MeV)
Structure
Size
1
FillValue
0.000000e+00
Particle
ParticleType
Proton
Qualifier
Average
ParticleQuantity
NumberFlux
EnergyRange
Low
30.55
High
56.47
Units
MeV
Parameter #3
Name
Proton Flux 120.7-227.3 MeV
Description
This flux is obtained from HET and is derived from pulse height data using R2 for normalization
Units
particles/(cm**2 sec ster MeV)
Structure
Size
1
FillValue
0.000000e+00
Particle
ParticleType
Proton
Qualifier
Average
ParticleQuantity
NumberFlux
EnergyRange
Low
120.7
High
227.3
Units
MeV
Parameter #4
Name
Helium Flux 3.44-4.97 MeV/n
Description
This flux is obtained from LET-1 and is derived from pulse height data using R11B for normalization
Units
particles/(cm**2 sec ster MeV/n)
Structure
Size
1
FillValue
0.000000e+00
Particle
ParticleType
AlphaParticle
Qualifier
Average
ParticleQuantity
NumberFlux
EnergyRange
Low
3.44
High
4.97
Units
MeV/n
Parameter #5
Name
Helium Flux 10.03-21.7 MeV/n
Description
This flux is obtained from LET-1 and is derived from pulse height data using R11B for normalization
Units
particles/(cm**2 sec ster MeV/n)
Structure
Size
1
FillValue
0.000000e+00
Particle
ParticleType
AlphaParticle
Qualifier
Average
ParticleQuantity
NumberFlux
EnergyRange
Low
10.03
High
21.7
Units
MeV/n
Parameter #6
Name
Helium Flux 30.67-56.7 MeV/n
Description
This flux is obtained from HET and is derived from pulse height data using R2B for normalization
Units
particles/(cm**2 sec ster MeV/n)
Structure
Size
1
FillValue
0.000000e+00
Particle
ParticleType
AlphaParticle
Qualifier
Average
ParticleQuantity
NumberFlux
EnergyRange
Low
30.67
High
56.7
Units
MeV/n
Parameter #7
Name
Helium Flux 112.7-413 MeV/n
Description
This flux is obtained from HET and is derived from pulse height data using R3A for normalization
Units
particles/(cm**2 sec ster MeV/n)
Structure
Size
1
FillValue
0.000000e+00
Particle
ParticleType
AlphaParticle
Qualifier
Average
ParticleQuantity
NumberFlux
EnergyRange
Low
112.7
High
413
Units
MeV/n
Parameter #8
Name
Electron Flux 2-6 MeV
Description
This flux is obtained from HET and is derived from pulse height data using R1 for normalization
Units
particles/(cm**2 sec ster MeV/n)
Structure
Size
1
FillValue
0.000000e+00
Particle
ParticleType
Electron
Qualifier
Average
ParticleQuantity
NumberFlux
EnergyRange
Low
2
High
6
Units
MeV/n
Parameter #9
Name
Poisson uncertainties in fluxes
Description
These are the Poisson uncertainties in the eight fluxes named above as scalars. In the data records, each immediately follows the flux it refers to.
Units
particles/(cm**2 sec ster MeV/n)
Structure
Size
8
FillValue
-1.000000e+00
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleType
Electron
Qualifier
Uncertainty
ParticleQuantity
NumberFlux
Parameter #10
Name
Count rates
Description
These are 28 6-hour-averaged count rates corresponding to various telescope sensors singly and in coincidence, and, for some, for various levels of energy deposition in sensors. The documentation cited above gives conditions for each rate: which sensors, which species (one or more), etc.
Units
particles/sec
Structure
Size
28
FillValue
0.000000e+00
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleType
Electron
Qualifier
Average
ParticleQuantity
Counts
Parameter #11
Name
Count rate uncertainties
Description
These are Poisson uncertainties in each of the above-identified 28 6-hour-averaged count rates corresponding to various telescope sensors singly and in coincidence, and, for some, for various levels of energy deposition in sensors. The documentation cited above gives conditions for each rate: which sensors, which species (one or more), etc. The uncertainty for each count rate immediately follows that count rate in the data records.
Units
particles/sec
Structure
Size
28
FillValue
-1.000000e+00
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleType
Electron
Qualifier
Uncertainty
ParticleQuantity
Counts