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Data Access
Voyager2 LECP Average Filtered Rate Data in ASCII Format
FTPS from SPDF (not with most browsers)
HTTPS from SPDF
Voyager 2 Low-Energy Charged Particle (LECP) Proton Intensities in ASCII Format daily
var authors='Krimigis, Stamatios M.; Decker, Robert B.';
document.write(authors);
(2025).
Voyager 2 Low-Energy Charged Particle (LECP) Proton Intensities in ASCII Format daily.
[Data set].
Johns Hopkins University Applied Physics Laboratory; Space Physics Data Facility.
https://doi.org/10.48322/8d7b-mq11. Accessed on document.write(currentDateStr);.
Note: Proper references, including
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or other formats, should include the "Accessed on date" to identify the version of the resource being cited in a given publication.
ResourceID
spase://NASA/NumericalData/Voyager2/LECP/Flux/Proton/P1D
Description
Count Rates, Averaged Over All Sectors, Voyager2, LECP, Filtered, Channel, Calibrated, CadencePT24H
Each file in this directory contains one year's worth of data from the
LECP instrument on the Voyager 1 spacecraft. Each record in a file
contains 1-day (24-hour) averages of fluxes and flux uncertainties of
ions (Z>=1) in eight contiguous energy channels, from 0.040-4.00
Mev/ion. Each file contains a 2-line header that identifies the
spacecraft, data type and time resolution, and labels each column of
data. Statistical uncertainties represent one standard deviation.
Differential (in energy) flux units are: Ions/(cm^2 sec ster MeV).
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/Voyager2/LECP/Flux/Proton/P1D
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
Voyager 2 Low-Energy Charged Particle (LECP) Proton Intensities in ASCII Format daily
AlternateName
v2-LECP-PROTONFLUX-PT24H
DOI
https://doi.org/10.48322/8d7b-mq11
ReleaseDate
2026-07-21 12:08:53Z
RevisionHistory
RevisionEvent
ReleaseDate
2020-07-07 21:15:57Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-11-14 16:03:01Z
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 13:32:34Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-02-17 18:47:56Z
Note
Added DOI. TLK
RevisionEvent
ReleaseDate
2026-06-26 13:31:13Z
Note
Add 'Z' to TemporalDescription:TimeSpan:StopDate. ZCB
RevisionEvent
ReleaseDate
2026-07-21 12:08:53Z
Note
Added HelioData InformationURL. JWL
Description
Count Rates, Averaged Over All Sectors, Voyager2, LECP, Filtered, Channel, Calibrated, CadencePT24H
Each file in this directory contains one year's worth of data from the
LECP instrument on the Voyager 1 spacecraft. Each record in a file
contains 1-day (24-hour) averages of fluxes and flux uncertainties of
ions (Z>=1) in eight contiguous energy channels, from 0.040-4.00
Mev/ion. Each file contains a 2-line header that identifies the
spacecraft, data type and time resolution, and labels each column of
data. Statistical uncertainties represent one standard deviation.
Differential (in energy) flux units are: Ions/(cm^2 sec ster MeV).
Acknowledgement
Please acknowledge the LECP PI (S.M. Krimigis) and the lead LECP CoI (R.B. Decker)
PublicationInfo
Authors
Krimigis, Stamatios M.; Decker, Robert B.
PublicationDate
2025-11-14 16:03:01Z
PublishedBy
Johns Hopkins University Applied Physics Laboratory; Space Physics Data Facility
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Stamatios.M.Krimigis
2.
CoInvestigator
spase://SMWG/Person/Robert.B.Decker
3.
ArchiveSpecialist
spase://SMWG/Person/Lawrence.Brown
InformationURL
Name
Informational Website for Voyager 1 and 2 LECP Instrument
URL
http://sd-www.jhuapl.edu/VOYAGER/v2_data/v2_1d/v2_prot_1d/Read_Me.txt
Description
The webpage provides a detailed description of Proton Channel Intensity files.
InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/Voyager2_LECP_Flux_Proton_P1D
Description
The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.
PriorIDs
spase://VEPO/NumericalData/Voyager2/LECP/Flux.Proton.P1D
spase://VSPO/NumericalData/Voyager2/LECP/Flux/Proton/P1D
AccessInformation
RepositoryID
spase://SMWG/Repository/JHU_APL
Availability
Online
AccessRights
Open
AccessURL
Name
Voyager2 LECP Average Filtered Rate Data in ASCII Format
URL
http://sd-www.jhuapl.edu/VOYAGER/v2_data/v2_1d/v2_prot_1d/
Description
Count Rates, All Sectors Averaged, Voyager2, LECP, Filtered, Channel CSV Text Files, File Name Template: http://sd-www.jhuapl.edu/VOYAGER/v2_data/v2_1d/v2_prot_1d/v2_%Y_prot_flux_1d.txt
Format
Text
Encoding
GZIP
Acknowledgement
S.M. Krimigis, JHU/APL
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/voyager/voyager2/particle/lecp/v2_prot_flux_1day/
Description
http access to annual ASCII files
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/voyager/voyager2/particle/lecp/v2_prot_flux_1day/
Description
In CDF via HTTP from SPDF
Format
Text
Acknowledgement
S.M. Krimigis, JHU/APL, and the Space Physics Data Facility
InstrumentIDs
spase://SMWG/Instrument/Voyager2/LECP
MeasurementType
EnergeticParticles
TemporalDescription
TimeSpan
StartDate
1977-09-07 00:00:00.000Z
StopDate
2009-05-31 23:59:59.999Z
Cadence
PT24H
ObservedRegion
Heliosphere.Outer
ObservedRegion
Heliosphere.Heliosheath
Parameter #1
Name
Start Time of Data Record
ParameterKey
StartTime
Description
Start Time for the record given in year, day of
year, hour.
Cadence
PT24H
Structure
Size
3
Element
Name
Year
Index
1
ValidMin
1977
ValidMax
2008
Element
Name
Day of year
Index
2
ValidMin
1
ValidMax
366
Element
Name
Hour of day
Index
3
ValidMin
0
ValidMax
23
Support
SupportQuantity
Temporal
Parameter #2
Name
Start Time of Data Record (Decimal Year)
ParameterKey
DEC_YEAR
Description
decimal year (double precision) = year + (doy - 1 + hr/24)/dpy (dpy=365 or 366)
Cadence
PT24H
Support
SupportQuantity
Temporal
Parameter #3
Name
Start Time of Data Record (Decimal Day of Year)
ParameterKey
DEC_DOY
Description
Decimal Day of Year (1.0-365.0 or 366.0)
Cadence
PT24H
Support
SupportQuantity
Temporal
Parameter #4
Name
CH1 Flux
ParameterKey
CH1_FLUX
Description
Channel 1 Proton Flux
Cadence
PT24H
Units
Protons/(cm^2 sec ster MeV)
FillValue
-1
Particle
ParticleType
Proton
ParticleQuantity
EnergyFlux
EnergyRange
Low
0.52
High
1.45
Units
MeV
Parameter #5
Name
CH1 Flux Uncertainty
ParameterKey
CH1_FLUXU
Description
Channel 1 Proton Flux Statistical Uncertainty
Cadence
PT24H
Units
Protons/(cm^2 sec ster MeV)
FillValue
-1
Particle
ParticleType
Proton
Qualifier
Uncertainty
ParticleQuantity
EnergyFlux
EnergyRange
Low
0.52
High
1.45
Units
MeV
Parameter #6
Name
CH16 Flux
ParameterKey
CH16_FLUX
Description
Channel 16 Proton Flux
Cadence
PT24H
Units
Protons/(cm^2 sec ster MeV)
FillValue
-1
Particle
ParticleType
Proton
ParticleQuantity
EnergyFlux
EnergyRange
Low
3.04
High
17.3
Units
MeV
Parameter #7
Name
CH16 Flux Uncertainty
ParameterKey
CH16_FLUXU
Description
Channel 16 Proton Flux Statistical Uncertainty
Cadence
PT24H
Units
Protons/(cm^2 sec ster MeV)
FillValue
-1
Particle
ParticleType
Proton
Qualifier
Uncertainty
ParticleQuantity
EnergyFlux
EnergyRange
Low
3.04
High
17.3
Units
MeV
Parameter #8
Name
CH23 Flux
ParameterKey
CH23_FLUX
Description
Channel 23 Proton Flux
Cadence
PT24H
Units
Protons/(cm^2 sec ster MeV)
FillValue
-1
Particle
ParticleType
Proton
ParticleQuantity
EnergyFlux
EnergyRange
Low
22.0
High
30.0
Units
MeV
Parameter #9
Name
CH23 Flux Uncertainty
ParameterKey
CH23_FLUXU
Description
Channel 23 Proton Flux Statistical Uncertainty
Cadence
PT24H
Units
Protons/(cm^2 sec ster MeV)
FillValue
-1
Particle
ParticleType
Proton
Qualifier
Uncertainty
ParticleQuantity
EnergyFlux
EnergyRange
Low
22.0
High
30.0
Units
MeV