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IMP 8 Cosmic Ray Nuclear Composition (CRNC) hourly energetic alpha particle fluxes

(2025). IMP 8 Cosmic Ray Nuclear Composition (CRNC) hourly energetic alpha particle fluxes. [Data set]. Space Physics Data Facility. https://doi.org/10.48322/n8h3-d525. Accessed on .

Note: Proper references, including 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/Helium_PT1H

Description
This data set contains hourly, spin-averaged fluxes of alpha particles from the IMP8 Cosmic Ray Nuclear Composition experiment of U. Chicago and UNH. There are fluxes of alpha particles in 9 energy bins from 10.90-12.89 to 84.32-94.81 MeV/n. 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 may be subject to a different license.

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Details

Version:2.7.1

NumericalData

ResourceID
spase://NASA/NumericalData/IMP8/CRNC/Helium_PT1H
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
IMP 8 Cosmic Ray Nuclear Composition (CRNC) hourly energetic alpha particle fluxes
DOI
https://doi.org/10.48322/n8h3-d525
ReleaseDate
2025-12-04 13:29:34Z
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
Description
This data set contains hourly, spin-averaged fluxes of alpha particles from the IMP8 Cosmic Ray Nuclear Composition experiment of U. Chicago and UNH. There are fluxes of alpha particles in 9 energy bins from 10.90-12.89 to 84.32-94.81 MeV/n. 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/alphas/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/Helium_PT1H
spase://VSPO/NumericalData/IMP8/CRNC/Helium_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/alphas/
Description
ftp access to alpha particle-specific subdirectory holding annual ASCII files
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/imp/imp8/particles_uchi/hourly/alphas/
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 00:00:00
StopDate
2001-10-26 00:00:00
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
Alpha particle fluxes
ParameterKey
Column_5-Column_13
Description
Spin-integrated fluxes of alpha particles, at 1-hour resolution, in nine energy bins: 10.90-12.89, 12.89-16.35, 16.35-19.95, 19.95-25.36, 30.61-42.03, 42.03-55.40, 55.40-69.64, 69.64-84.32, 84.32-94.81 MeV/n
Cadence
PT1H
Units
1/sec-cm**2-ster-MeV/n
Structure
Size
9
Description
Array of fluxes at 9 energy windows
Particle
ParticleType
AlphaParticle
ParticleQuantity
NumberFlux
AtomicNumber
2
EnergyRange
Low
10.90
High
94.81
Units
MeV/n
NASA Insignia
Contact SPDF: NASA-SPDF Feedback/Support
Responsible NASA Official: Robert M. Candey
Site Editor: Tami Kovalick
SPDF ROR ID
SPDF re3data ID
About NASA
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Last Updated: 2025-12-04