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

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.

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Details

Version:2.2.9

NumericalData

ResourceID
spase://NASA/NumericalData/IMP8/CRNC/Helium_PT1H
ResourceHeader
ResourceName
IMP 8 Cosmic Ray Nuclear Composition (CRNC) hourly energetic alpha particle fluxes
ReleaseDate
2021-03-11 18:39:11Z
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.
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://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
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