Version:2.2.9
NumericalData
ResourceID
spase://NASA/NumericalData/IMP8/CRNC/PT15M
ResourceHeader
ResourceName
IMP 8 Cosmic Ray Nuclear Composition (CRNC) 15-min PHA and coincidence mode counts
ReleaseDate
2021-03-11 18:39:11Z
Description
This 15-min-resolution data set consists of 5 count rates from the Low Energy Telescope,
8 count rates for the main telescope (MT), 4 counts of pulse height analyzed events in each of 4 MT
coincidence modes, and 27 box counts corresponding to specific species and energy ranges associated
with 3 of the MT coincidence modes. Actually the 13 referenced "count rates" are given as paired counts
and accumulation times. Associated documentation suggests algorithms for computation of count rates and
fluxes from the MT data given, for electrons in 3 energy bands (0.7-2.0, 2.0-12, 12-50 MeV), protons in 9 bands
(11.24-20.00 MeV to 74.50-94.78 MeV), helium nuclei in 10 bands (10.90-12.89 MeV per n to 84.32-94.81 MeV per n),
and CNO nuclei in 1 band (25 - 250 Mev per n). There are no azimuthally sectored data in this data set.
The data are accessible via ftp and, with higher functionality, via FTPBrowser.
Acknowledgement
C. Lopate, UNH, and the late J. Simpson, U. Chi
Contacts
InformationURL
Name
Voldesc file at SPDF
URL
Description
Detailed documentation file about experiment and data
PriorIDs
spase://VEPO/NumericalData/IMP8/UChi/PT15M
spase://VEPO/NumericalData/IMP8/CRNC/PT15M
spase://VSPO/NumericalData/IMP8/CRNC/PT15M
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPBrowser
URL
Description
Interface to plot or list parameter subsets
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description
download files by ftp
AccessURL
Name
HTTPS from SPDF
URL
Description
In CDF via HTTP from SPDF
Format
Text
DataExtent
Acknowledgement
C. Lopate, UNH, the late J. Simpson, U. Chicago, and the NSSDC and SPDF at GSFC
ProcessingLevel
Uncalibrated
InstrumentIDs
MeasurementType
EnergeticParticles
TemporalDescription
TimeSpan
StartDate
1973-10-30 00:00:00
StopDate
2000-09-30 00:00:00
Cadence
PT15M
ObservedRegion
Heliosphere.NearEarth
Caveats
Data must be processed to obtain count rates and fluxes. Note that records with no data have spacecraft ID = 0 in first word.
Parameter #1
Name
Coincidence mode counts
Description
A set of 13 counts of events corresponding various telescope coincidence modes and discriminator levels
Cadence
PT15M
Structure
Size
13
Description
A set of 13 counts of events corresponding various telescope coincidence modes and discriminator levels. Counts are due to a mix of protons and alpha particles identified below plus 0.7-50 MeV electrons.
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleQuantity
Counts
EnergyRange
Low
0.54
High
94.78
Units
MeV per n
Parameter #2
Name
Count accumulation durations
Description
A set of 13 accumulation durations (in seconds) corresponding to the 13 coincidence mode counts described above
Cadence
PT15M
Units
sec
Structure
Size
13
Description
A set of 13 accumulation durations (in seconds) corresponding to the 13 coincidence mode counts described above
Support
Parameter #3
Name
Counts of events pulse height analyzed
Description
A set of 4 counts of events pulse height analyzed in various coincidence modes for this interval for the CPI main telescope
Cadence
PT15M
Structure
Size
4
Description
A set of 4 counts of events pulse height analyzed in various coincidence modes for this interval. Counts are due to a mix of protons and alpha particles identified below plus 0.7-50 MeV electrons.
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleQuantity
Counts
EnergyRange
Low
11.24
High
94.78
Units
MeV per n
Parameter #4
Name
Box counts for specific species
Description
A set of 27 counts in E-dE/dx boxes corresponding to known species and energy ranges. In particular, there are 9 proton counts with energy ranges between 11.24-12.62 MeV and 74.50-94.78 MeV plus 2 proton counts aggregated over subsets of the 9, 10 alpha particle counts with energy ranges between 10.90-12.89 MeV/n and 84.32-94.81 MeV/n plus 2 alpha particle counts aggregated over subsets of the 10, 3 electron boxes at 0.7-2.0 MeV, 2.0-12 MeV, and 12-50 MeV, and one CNO box at ~25-250 MeV/n
Caveats
Data and companion documentation (algorithms, geometric factors, etc.) enable calculation of count rates and fluxes
Cadence
PT15M
Structure
Size
27
Description
A set of 27 box counts as described above
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleQuantity
Counts
EnergyRange
Low
11.24
High
94.78
Units
MeV per n
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