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Data Access

HEO-1 Data from the EXP instrument in 15-second averages

ResourceID
spase://NASA/NumericalData/HEO1/EXP/PT15S

Description

These data consist of energetic particle measurements, given as proton counts, electron counts, and dose/dose rate. The spacecraft are equipped with a combination of dome and telescope dosimeters. Data from these instruments is available in 15-second averages and binned by magnetic L-shell in IGRF and Olson-Pfitzer (Quiet) field models.

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Details

Version:2.7.1

MetadataRightsList

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 SPASE metadata descriptions

Version:2.7.1

NumericalData

ResourceID
spase://NASA/NumericalData/HEO1/EXP/PT15S
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
HEO-1 Data from the EXP instrument in 15-second averages
ReleaseDate
2026-07-21 12:05:04Z
RevisionHistory
RevisionEvent
ReleaseDate
2020-07-07 21:14:34Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-12-04 13:29:21Z
Note
Added MetadataRightsList. Added ResourceType and NamingAuthority. Updated to 2.7.1. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB
RevisionEvent
ReleaseDate
2026-06-26 13:17:11Z
Note
Add 'Z' to TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB
RevisionEvent
ReleaseDate
2026-07-21 12:05:04Z
Note
Added HelioData InformationURL. JWL
Description

These data consist of energetic particle measurements, given as proton counts, electron counts, and dose/dose rate. The spacecraft are equipped with a combination of dome and telescope dosimeters. Data from these instruments is available in 15-second averages and binned by magnetic L-shell in IGRF and Olson-Pfitzer (Quiet) field models.

Contacts
Role Person StartDate StopDate Note
1. GeneralContact spase://SMWG/Person/T.Paul.OBrien
InformationURL
Name
ViRBO web page for this dataset
URL
http://virbo.org/HEO
Description

Top-level web page for data set

InformationURL
Name
README for dataset
URL
http://mag.gmu.edu/ftp/users/obrien/heo/ascii/README.txt
Description

README for dataset

InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/HEO1_EXP_PT15S
Description

The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.

PriorIDs
spase://ViRBO/NumericalData/HEO1/EXP/PT15S
spase://VSPO/NumericalData/HEO-1/EXP/PT15S
spase://VSPO/NumericalData/HEO1/EXP/PT15S
AccessInformation
RepositoryID
spase://SMWG/Repository/ViRBO
Availability
Online
AccessRights
Open
AccessURL
Name
export Level 2 text files for Flight 1
URL
http://mag.gmu.edu/ftp/users/obrien/heo/ascii/f1/exp/
Format
Text.ASCII
Encoding
None
MeasurementType
EnergeticParticles
TemporalDescription
TimeSpan
StartDate
1994-06-06 00:00:00.00000Z
StopDate
2006-08-16 00:00:00.00000Z
Cadence
PT15S
ObservedRegion
Earth.NearSurface
Parameter #1
Name
Year
ParameterKey
Year
Description

Year of Measurement

Mixed
MixedQuantity
Other
Parameter #2
Name
Month
ParameterKey
Month
Description

Month of Measurement

Mixed
MixedQuantity
Other
Parameter #3
Name
Day
ParameterKey
Day
Description

Day of Measurement

Mixed
MixedQuantity
Other
Parameter #4
Name
DecDay
ParameterKey
DecDay
Description

Decimal Day of Measurement

Mixed
MixedQuantity
Other
Parameter #5
Name
nSeconds
ParameterKey
nSeconds
Description

Second of day of measurement

Units
sec
Mixed
MixedQuantity
Other
Parameter #6
Name
Elec1
ParameterKey
Elec1
Description

Electron particle channel 1

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #7
Name
Elec2
ParameterKey
Elec1
Description

Electron particle channel 2

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #8
Name
Elec3
ParameterKey
Elec3
Description

Electron particle channel 3

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #9
Name
Elec4
ParameterKey
Elec4
Description

Electron particle channel 4

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #10
Name
Elec5
ParameterKey
Elec5
Description

Electron particle channel 5

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #11
Name
Elec6
ParameterKey
Elec3
Description

Electron particle channel 6

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #12
Name
Prot1
ParameterKey
Prot1
Description

Proton particle channel 1

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #13
Name
Prot2
ParameterKey
Prot2
Description

Proton particle channel 2

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #14
Name
Prot3
ParameterKey
Prot3
Description

Proton particle channel 3

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #15
Name
Prot4
ParameterKey
Prot4
Description

Proton particle channel 4

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #16
Name
Prot5
ParameterKey
Prot5
Description

Proton particle channel 5

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #17
Name
Prot6
ParameterKey
Prot6
Description

Proton particle channel 6

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #18
Name
Prot7
ParameterKey
Prot7
Description

Proton particle channel 7

Units
counts/sec
Mixed
MixedQuantity
Other
Parameter #19
Name
Dose1
ParameterKey
Dose1
Description

Dose channel 1

Units
Rads
Mixed
MixedQuantity
Other
Parameter #20
Name
Dose2
ParameterKey
Dose2
Description

Dose channel 2

Units
Rads
Mixed
MixedQuantity
Other
Parameter #21
Name
Dose3
ParameterKey
Dose3
Description

Dose channel 3

Units
Rads
Mixed
MixedQuantity
Other
Parameter #22
Name
Dose4
ParameterKey
Dose4
Description

Dose channel 4

Units
Rads
Mixed
MixedQuantity
Other
Parameter #23
Name
Dose1_rate
ParameterKey
Dose1_rate
Description

Dose channel 1 rate

Units
Rads
Mixed
MixedQuantity
Other
Parameter #24
Name
Dose2_rate
ParameterKey
Dose2_rate
Description

Dose channel 2 rate

Units
rads/sec
Mixed
MixedQuantity
Other
Parameter #25
Name
Dose3_rate
ParameterKey
Dose3_rate
Description

Dose channel 3 rate

Units
rads/sec
Mixed
MixedQuantity
Other
Parameter #26
Name
Dose4_rate
ParameterKey
Dose4_rate
Description

Dose channel 4 rate

Units
rads/sec
Mixed
MixedQuantity
Other
Parameter #27
Name
SC_Temp
ParameterKey
SC_Temp
Description

Spacecraft temperature

Units
deg C
Mixed
MixedQuantity
Other
Parameter #28
Name
JulDate
ParameterKey
JulDate
Description

Julian Date

Mixed
MixedQuantity
Other
Parameter #29
Name
Orbit_Status_IGRF
ParameterKey
Orbit_Status_IGRF
Description

flag, identifies orbit segment with respect to IGRF B-field model

Mixed
MixedQuantity
Other
Parameter #30
Name
Orbit_Status_OP
ParameterKey
Orbit_Status_OP
Description

flag, identifies orbit segment with respect to Olson-Pfitzer B-field model model

Mixed
MixedQuantity
Other
Parameter #31
Name
TiltAngle
ParameterKey
TiltAngle
Units
degrees
Mixed
MixedQuantity
Other
Parameter #32
Name
RadDist
ParameterKey
RadDist
Description

Radial distance of spacecraft

Units
Re
Mixed
MixedQuantity
Other