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Data Access
FTPS from SPDF (not with most browsers)
HTTPS from SPDF
IMP 8 UMD EECA 10.92m Rates, PHA
var authors='Gloeckler, George; Ipavich, Fred M.';
document.write(authors);
(2025).
IMP 8 UMD EECA 10.92m Rates, PHA.
[Data set].
Space Physics Data Facility.
https://doi.org/10.48322/8rzv-9k70. 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/IMP8/EECA/PT11M
Description
This data set, from the Electrostatic Energy-Charge
Analyzer (EECA) part of the U. Maryland experiment on IMP 8, contains
count rate and pulse height data enabling the computation of 10.92-min
resolution fluxes of: singly ionized ions in 5 energy/charge windows of
lower limits between 130 and 740 keV/Q; doubly charged ions in the same
5 keV/Q windows plus another at 65 keV/Q; ions with charge states between
5 and 8 in the same 6 keV/Q windows as for doubly charged ions plus
another at 37 keV/Q; ions with charge states above about 10 at 37 and 65
keV/Q windows; 600-860 keV electrons. Some of the modes are spin
integrated while others are given in 90 deg quadrants about the spacecraft
spin vector (which is normal to the ecliptic plane). The data set was
created at NSSDC from the U.Md.-provided "summary tapes" (NSSDC IDs
SPHE-00170 and 73-078A-03C) by dropping engineering data, dropping data
from the ULET portion of the overall experiment (the ULET instrument
failed in 1978), and converting the remaining time, spacecraft position,
and EECA instrument data from binary to ASCII representation. The data
are available via ftp in 1- month files of variable lengths in the 3-6 MB
size range.
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/IMP8/EECA/PT11M
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
IMP 8 UMD EECA 10.92m Rates, PHA
DOI
https://doi.org/10.48322/8rzv-9k70
ReleaseDate
2026-06-26 13:17:55Z
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 13:17:55Z
Note
Add 'Z' to TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB
Description
This data set, from the Electrostatic Energy-Charge
Analyzer (EECA) part of the U. Maryland experiment on IMP 8, contains
count rate and pulse height data enabling the computation of 10.92-min
resolution fluxes of: singly ionized ions in 5 energy/charge windows of
lower limits between 130 and 740 keV/Q; doubly charged ions in the same
5 keV/Q windows plus another at 65 keV/Q; ions with charge states between
5 and 8 in the same 6 keV/Q windows as for doubly charged ions plus
another at 37 keV/Q; ions with charge states above about 10 at 37 and 65
keV/Q windows; 600-860 keV electrons. Some of the modes are spin
integrated while others are given in 90 deg quadrants about the spacecraft
spin vector (which is normal to the ecliptic plane). The data set was
created at NSSDC from the U.Md.-provided "summary tapes" (NSSDC IDs
SPHE-00170 and 73-078A-03C) by dropping engineering data, dropping data
from the ULET portion of the overall experiment (the ULET instrument
failed in 1978), and converting the remaining time, spacecraft position,
and EECA instrument data from binary to ASCII representation. The data
are available via ftp in 1- month files of variable lengths in the 3-6 MB
size range.
Acknowledgement
Please acknowledge the successive PI's George Gloeckler,
and Fred Ipavich.
PublicationInfo
Authors
Gloeckler, George; Ipavich, Fred M.
PublicationDate
2025-11-14 16:02:24Z
PublishedBy
Space Physics Data Facility
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/George.Gloeckler
2.
PrincipalInvestigator
spase://SMWG/Person/Fred.M.Ipavich
InformationURL
Name
NSSDC Data Set Catalog
URL
https://spdf.gsfc.nasa.gov/pub/documents/old/documentation_from_nssdc/dataset_catalogs/DSC_0476.pdf
Description
See especially the instrument-team-generated
descriptive material on the experiment and data inside the Data Set
Catalog
PriorIDs
spase://VEPO/NumericalData/IMP8/EECA/PT11M
spase://VSPO/NumericalData/IMP8/EECA/PT11M
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_umd/11min_ascii/
Description
monthly ASCII files via ftp
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/imp/imp8/particles_umd/11min_ascii/
Description
In CDF via HTTP from SPDF
Format
Text
DataExtent
Quantity
1.5
Units
GB
Acknowledgement
Please acknowledge the successive PI's, George Gloeckler,
Fred Ipavich, and NSSDC and SPDF.
ProcessingLevel
Uncalibrated
InstrumentIDs
spase://SMWG/Instrument/IMP8/EECA
MeasurementType
EnergeticParticles
TemporalDescription
TimeSpan
StartDate
1973-11-01 00:00:00Z
StopDate
2001-10-26 00:00:00Z
Cadence
PT11M
ObservedRegion
Heliosphere.NearEarth
ObservedRegion
Earth.Magnetosphere.Magnetotail
Parameter #1
Name
Spin Integrated Counts
Description
This parameter contains five data words for each of
six charge state - energy/charge (or species - energy range) combinations.
The five words are (a) number of good readouts, (b) number of bad readouts,
(c) total spin-integrated counts, (d) sum of squares of readout-specific
counts, (e) accumulation times in seconds. Charge state - energy/charge
and species - energy range combinations are specified in the "elements"
below, where only the "counts" word is called out explicitly.
Cadence
PT11M
Structure
Size
6 5
Description
Array of the 5 words defined above for each of
the 6 charge state - energy/charge (or species - energy range)
combinations listed in the element names below.
Element
Name
Counts of Q.GE.1, 160-230 keV/Q ions
Index
1 3
ParameterKey
Column_30
Units
counts
Element
Name
Counts of Q.GE.2, 550-900 keV/Q ions
Index
2 3
ParameterKey
Column_35
Units
counts
Element
Name
Counts of Q.GE.4, 65-100 keV/Q ions
Index
3 3
ParameterKey
Column_40
Units
counts
Element
Name
Counts of protons .GE. 18 MeV
Index
4 3
ParameterKey
Column_45
Units
counts
Element
Name
Counts of protons .GE. 6 MeV
Index
5 3
ParameterKey
Column_50
Units
counts
Element
Name
Counts of electrons 600-860 keV
Index
6 3
ParameterKey
Column_55
Units
counts
Particle
ParticleType
Ion
Qualifier
Average
ParticleQuantity
Counts
EnergyRange
Low
65
High
900
Units
keV/Q
Parameter #2
Name
Sectored and spin-integrated Counts
Description
This parameter contains nine data words for each of
nine charge state - energy/charge (or species - energy range) combinations.
The nine words are (a) number of good readouts, (b) number of bad readouts,
(c) total spin-integrated counts for all readouts and sectors, (d) sum of
squares of readout-specific, sector-specific counts, (e) accumulation time
per sector, in seconds, (f) total counts in 90-deg sector 1, (g ) total
counts in 90-deg sector 2, (h) total counts in 90-deg sector 3, (i) total
counts in 90-deg sector 4. Charge state - energy/charge combinations are
specified in the "elements" below, where only the "sector 1 counts" word
is called out explicitly.
Cadence
PT11M
Structure
Size
9 9
Description
Array of the 9 words defined above for each of
the 9 charge state - energy/charge combinations listed in the element
names below.
Element
Name
Sector 1 counts of Q.GE.1, .GE.160 keV/Q ions
Index
1 6
ParameterKey
Column_63
Units
counts
Element
Name
Sector 1 Counts of Q.GE.1, 550-900 keV/Q ions
Index
2 6
ParameterKey
Column_72
Units
counts
Element
Name
Sector 1 counts of Q.GE.1, 390-600 keV/Q ions
Index
3 6
ParameterKey
Column_81
Units
counts
Element
Name
Sector 1 counts of Q.GE.1, 130-210 keV/Q ions
Index
4 6
ParameterKey
Column_90
Units
counts
Element
Name
Sector 1 Counts of Q.GE.4, 390-600 keV/Q
Index
5 6
ParameterKey
Column_99
Units
counts
Element
Name
Sector 1 Counts of 600-860 keV electrons
Index
6 6
ParameterKey
Column_108
Units
counts
Element
Name
Sector 1 Counts of Q.GE.1, 740-1200 keV/Q
Index
7 6
ParameterKey
Column_117
Units
counts
Element
Name
Sector 1 Counts of Q.GE.2, 65-100 keV/Q
Index
8 6
ParameterKey
Column_126
Units
counts
Element
Name
Sector 1 Counts of Q.GE.6, 37-55 keV/Q
Index
9 6
ParameterKey
Column_135
Units
counts
Particle
ParticleType
Ion
Qualifier
Average
ParticleQuantity
Counts
EnergyRange
Low
65
High
900
Units
keV/Q
Parameter #3
Name
Distribution of arrival directions of pulse-height-analyzed particles
Description
This parameter contains ten data words for each of
ten charge state - energy/charge combinations. (For each particle analyzed,
maximum of one per 1.28s, the spacecraft spin phase to the nearest 45 deg is
captured.) The ten words are (a) number of legal events, (b) number of
illegal events, (c through j) counts of events analyzed in sectors 0 through 7,
respectively. Charge state - energy/charge combinations are specified in the
"elements" below, where only the "sector 0 counts of events analyzed" word is
called out explicitly.
Cadence
PT11M
Structure
Size
10 10
Description
Array of the 10 words defined above for each of
the 10 charge state - energy/charge combinations listed in the element
names below.
Element
Name
Sector 0 counts of Q.GE.6, 37-55 keV/Q ions analyzed (P1)
Index
1 3
ParameterKey
Column_140
Units
counts
Element
Name
Sector 0 counts of Q.GE.2, 65-100 keV/Q ions analyzed (P2)
Index
2 3
ParameterKey
Column_150
Units
counts
Element
Name
Sector 0 counts of Q.GE.4, 65-100 keV/Q ions analyzed (P2")
Index
3 3
ParameterKey
Column_160
Units
counts
Element
Name
Sector 0 counts of Q.GE.1, 130-210 keV/Q ions analyzed (P3)
Index
4 3
ParameterKey
Column_170
Units
counts
Element
Name
Sector 0 counts of Q.GE.1, 160-230 keV/Q ions analyzed (P4)
Index
5 3
ParameterKey
Column_180
Units
counts
Element
Name
Sector 0 counts of Q.GE.1, .GE.160 keV/Q ions analyzed (P5)
Index
6 3
ParameterKey
Column_190
Units
counts
Element
Name
Sector 0 counts of Q.GE.1, 390-600 keV/Q ions analyzed(P6)
Index
7 3
ParameterKey
Column_200
Units
counts
Element
Name
Sector 0 counts of Q.GE.1, 550-900 keV/Q ions analyzed (P7)
Index
8 3
ParameterKey
Column_210
Units
counts
Element
Name
Sector 0 counts of Q.GE.2, 550-900 keV/Q ions analyzed(P7')
Index
9 3
ParameterKey
Column_220
Units
counts
Element
Name
Sector 0 counts of Q.GE.1, 740-1200 keV/Q ions analyzed (P8)
Index
10 3
ParameterKey
Column_230
Units
counts
Particle
ParticleType
Ion
Qualifier
Average
ParticleQuantity
Counts
EnergyRange
Low
37
High
1200
Units
keV/Q
Parameter #4
Name
Counts of events analyzed, by event type and charge group
Description
This parameter contains 33 counts of events analyzed,
after pulse height analysis has enabled charge group separations for each
of the ten "event types" listed in the preceding parameter array; see the
names of the elements of that array for the event type labels (e.g., P1)
used below. Note that of the 33 event counts, only 20 correspond to
meaningful charge groups, while 13 correspond to background rates
that are labelled as BG-low (low discriminator channels) or BG-High
(high discriminator channels). Above-referenced documentation contains
a mapping of discriminator channels to charge groups and background effect,
for each of the 10 "event types." Spin phase information is not retained
in these 33 event counts.
Cadence
PT11M
Structure
Size
33
Description
List of 33 counts of events analyzed, by event type
and charge group
Element
Name
Counts of events analyzed, P1, Q:5-8
Index
1
ParameterKey
Column_238
Units
counts
Element
Name
Counts of events analyzed, P1, Q.GE.13
Index
2
ParameterKey
Column_239
Units
counts
Element
Name
Counts of events analyzed, P1, BG-Low
Index
3
ParameterKey
Column_240
Units
counts
Element
Name
Counts of events analyzed, P1, BG-High
Index
4
ParameterKey
Column_241
Units
counts
Element
Name
Counts of events analyzed, P2, Q=2
Index
5
ParameterKey
Column_242
Units
counts
Element
Name
Counts of events analyzed, P2, BG-Low
Index
6
ParameterKey
Column_243
Units
counts
Element
Name
Counts of events analyzed, P2", Q:5-8
Index
7
ParameterKey
Column_244
Units
counts
Element
Name
Counts of events analyzed, P2", Q.GE.13
Index
8
ParameterKey
Column_245
Units
counts
Element
Name
Counts of events analyzed, P2", BG-High
Index
9
ParameterKey
Column_246
Units
counts
Element
Name
Counts of events analyzed, P3, Q=1
Index
10
ParameterKey
Column_247
Units
counts
Element
Name
Counts of events analyzed, P3, Q=2
Index
11
ParameterKey
Column_248
Units
counts
Element
Name
Counts of events analyzed, P3, Q:5-8
Index
12
ParameterKey
Column_249
Units
counts
Element
Name
Counts of events analyzed, P3, BG-High
Index
13
ParameterKey
Column_250
Units
counts
Element
Name
Counts of events analyzed, P4, Q=1
Index
14
ParameterKey
Column_251
Units
counts
Element
Name
Counts of events analyzed, P4, Q=2
Index
15
ParameterKey
Column_252
Units
counts
Element
Name
Counts of events analyzed, P4, Q:5-8
Index
16
ParameterKey
Column_253
Units
counts
Element
Name
Counts of events analyzed, P4, BG-High
Index
17
ParameterKey
Column_254
Units
counts
Element
Name
Counts of events analyzed, P5, BG-Low
Index
18
ParameterKey
Column_255
Units
counts
Element
Name
Counts of events analyzed, P5, BG-High
Index
19
ParameterKey
Column_256
Units
counts
Element
Name
Counts of events analyzed, P6, Q=1
Index
20
ParameterKey
Column_257
Units
counts
Element
Name
Counts of events analyzed, P6, Q=2
Index
21
ParameterKey
Column_258
Units
counts
Element
Name
Counts of events analyzed, P6, Q:5-8
Index
22
ParameterKey
Column_259
Units
counts
Element
Name
Counts of events analyzed, P6, BG-Low
Index
23
ParameterKey
Column_260
Units
counts
Element
Name
Counts of events analyzed, P6, BG-High
Index
24
ParameterKey
Column_261
Units
counts
Element
Name
Counts of events analyzed, P7, Q=1
Index
25
ParameterKey
Column_262
Units
counts
Element
Name
Counts of events analyzed, P7', Q=2
Index
26
ParameterKey
Column_263
Units
counts
Element
Name
Counts of events analyzed, P7', Q:5-8
Index
27
ParameterKey
Column_264
Units
counts
Element
Name
Counts of events analyzed, P7', BG-High
Index
28
ParameterKey
Column_265
Units
counts
Element
Name
Counts of events analyzed, P8, Q=1
Index
29
ParameterKey
Column_266
Units
counts
Element
Name
Counts of events analyzed, P8, Q=2
Index
30
ParameterKey
Column_267
Units
counts
Element
Name
Counts of events analyzed, P8, Q:5-8
Index
31
ParameterKey
Column_268
Units
counts
Element
Name
Counts of events analyzed, P8, BG-Low
Index
32
ParameterKey
Column_269
Units
counts
Element
Name
Counts of events analyzed, P8, BG-High
Index
33
ParameterKey
Column_270
Units
counts
Particle
ParticleType
Ion
Qualifier
Average
ParticleQuantity
Counts
EnergyRange
Low
37
High
1200
Units
keV/Q
Parameter #5
Name
Spacecraft position vector
Description
GSE X,Y,Z components of spacecraft position
vector, in km.
Cadence
PT11M
Structure
Size
3
Description
GSE X,Y,Z components of spacecraft position
vector, in km.
Element
Name
X Component, GSE
Qualifier
Component.I
Index
1
ParameterKey
Column_07
Units
km
Element
Name
Y Component, GSE
Qualifier
Component.J
Index
2
ParameterKey
Column_08
Units
km
Element
Name
Z Component, GSE
Qualifier
Component.K
Index
3
ParameterKey
Column_09
Units
km
Support
SupportQuantity
Positional