An official website of the United States government
Here's how you know v
Official websites use .gov
A .gov websites belongs to an official government organization in the United States
Secure .gov website use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Data Access
FTPS from SPDF (not with most browsers)
HTTPS from SPDF
FTPBrowser
Multi-Source Spectral Plot
IMP 8 Cosmic Ray Nuclear Composition (CRNC) hourly energetic proton fluxes
var authors='Lopate, Clifford';
document.write(authors);
(2025).
IMP 8 Cosmic Ray Nuclear Composition (CRNC) hourly energetic proton fluxes.
[Data set].
Space Physics Data Facility.
https://doi.org/10.48322/2svq-8b83. Accessed on document.write(currentDateStr);.
Note: Proper references, including
Copy BibTeX Citation
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/IMP8/CRNC/Protons_PT1H
Description
This data set contains hourly, spin-averaged
fluxes of protons from the IMP8. Cosmic Ray Nuclear Composition
experiment of U. Chicago and UNH. There are are fluxes of protons
in 9 energy bins from 11.24-12.62 to 74.50-94.78 MeV. These fluxes
were generated at GSFC/SPDF from count rates accessible from
UNH.
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.
View XML |
Edit
Details
Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/IMP8/CRNC/Protons_PT1H
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
IMP 8 Cosmic Ray Nuclear Composition (CRNC) hourly energetic proton fluxes
DOI
https://doi.org/10.48322/2svq-8b83
ReleaseDate
2026-06-26 13:17:54Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-03-11 18:39:11Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-11-14 16:02:24Z
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 13:29:34Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-06-26 13:17:54Z
Note
Add 'Z' to TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB
Description
This data set contains hourly, spin-averaged
fluxes of protons from the IMP8. Cosmic Ray Nuclear Composition
experiment of U. Chicago and UNH. There are are fluxes of protons
in 9 energy bins from 11.24-12.62 to 74.50-94.78 MeV. These fluxes
were generated at GSFC/SPDF from count rates accessible from
UNH.
Acknowledgement
Acknowledge the late John A. Simpson, the
original CRNC PI, and Clifford Lopate/UNH, current PI.
PublicationInfo
Authors
Lopate, Clifford
PublicationDate
2025-11-14 16:02:24Z
PublishedBy
Space Physics Data Facility
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Clifford.Lopate
InformationURL
Name
Readme file at SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/imp/imp8/particles_uchi/hourly/protons/aareadme.txt
InformationURL
Name
Comprehensive data descriptive file
URL
https://spdf.gsfc.nasa.gov/pub/data/imp/imp8/particles_uchi/15min_asci/voldesc.sfd
Description
SFDU-formatted file describing the CRNC instrument
and the 15-min data set of count rates and pulse height data from which the
hourly rates data set was created. Division of hourly rates by geometric
factor and energy band widths yielded the hourly fluxes.
PriorIDs
spase://VEPO/NumericalData/IMP8/CRNC/Protons_PT1H
spase://VSPO/NumericalData/IMP8/CRNC/Protons_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/imp/imp8/particles_uchi/hourly/protons/
Description
ftp access to proton-specific subdirectory
holding annual ASCII files
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/imp/imp8/particles_uchi/hourly/protons/
Description
In CDF via HTTP from SPDF
AccessURL
Name
FTPBrowser
URL
https://omniweb.gsfc.nasa.gov/ftpbrowser/imp_chi_crnc_1h.html
Description
Subset, plot and list fluxes of protons, alpha
particles and electron, and count rates of heavies, via FTPBrowser
AccessURL
Name
Multi-Source Spectral Plot
URL
https://omniweb.gsfc.nasa.gov/ftpbrowser/flux_spectr_m.html
Description
Spectral plots and power law fits for arbitrary durations
Format
Text
DataExtent
Quantity
1
Units
MB
Per
P1Y
Acknowledgement
Acknowledge C. Lopate, J. Simpson, and GSFC/SPDF
(Space Physics Data Facility)
InstrumentIDs
spase://SMWG/Instrument/IMP8/CRNC
MeasurementType
EnergeticParticles
TemporalDescription
TimeSpan
StartDate
1973-10-30 00:00:00Z
StopDate
2001-10-26 00:00:00Z
Cadence
PT1H
ObservedRegion
Heliosphere.NearEarth
Parameter #1
Name
Time
ParameterKey
Column_1-Column_3
Description
Time at start of flux average, as year, day, hour
Cadence
PT1H
Structure
Size
3
Description
year, day, hour
Support
SupportQuantity
Temporal
Parameter #2
Name
Fractional Coverage
ParameterKey
Column_4
Description
Fractional counting coverage (0-1) during this hour
Cadence
PT1H
Support
SupportQuantity
Temporal
Parameter #3
Name
Proton fluxes
ParameterKey
Column_5-Column_13
Description
Spin-integrated fluxes of protons, at 1-hour resolution,
in nine energy bins: 11.24-12.62, 12.62-16.18, 16.18-20.00, 20.00-29.75,
29.75-40.10, 40.10-50.90, 50.90-62.55, 62.55-74.50, 74.50-94.78 MeV
Cadence
PT1H
Units
1/sec-cm**2-ster-MeV
Structure
Size
9
Description
Array of fluxes at 9 energy windows
Particle
ParticleType
Proton
ParticleQuantity
NumberFlux
AtomicNumber
1
EnergyRange
Low
11.24
High
94.78
Units
MeV