Data Description

This page summarizes information about the selected resource and its origin based on SPASE metadata.

Table of Contents

  1. Product
  2. Repository
  3. Instrument
  4. ObservatoryObservatories
  5. Persons

SPASE version 2.2.1

Numerical Data Product: IMP 8 UMD EECA 10.92m Rates, PHA

Resource ID
spase://VEPO/NumericalData/IMP8/EECA/PT11M Get XML
Name
IMP 8 UMD EECA 10.92m Rates, PHA
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.

Additional information
NSSDC Data Set Catalog

See especially the instrument-team-generated descriptive material on the experiment and data inside the Data Set Catalog

Acknowledgement

Please acknowledge the successive PI's George Gloeckler, and Fred Ipavich.

Contact
Role Person
1. Principal investigator Prof. George Gloeckler Get XML
2. Principal investigator Fred M. Ipavich Get XML
Release date
2009-04-22 00:00:00
Repository
Name
SPDF Get XML
Availability
Online
Access rights
Open
URL
SPDF FTP area

monthly ASCII files via ftp

SPDF HTTP area

In CDF via HTTP from SPDF

Format
Text
File size
1.5 GB
Acknowledgement

Please acknowledge the successive PI's, George Gloeckler, Fred Ipavich, and NSSDC and SPDF.

Processing level
Uncalibrated
Instrument
Solid-State Detectors Get XML
Measurement type
Energetic particles
Temporal description
Start date
1973-11-01 00:00:00
Stop date
2001-10-26 00:00:00
Cadence
11 minutes
Observed regions
Earth.Magnetosphere.Magnetotail
Heliosphere.NearEarth

Parameters

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
11 minutes
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.

Elements
Index Name Parameter key Units
1 3 Counts of Q.GE.1, 160-230 keV/Q ions Column_30 counts
2 3 Counts of Q.GE.2, 550-900 keV/Q ions Column_35 counts
3 3 Counts of Q.GE.4, 65-100 keV/Q ions Column_40 counts
4 3 Counts of protons .GE. 18 MeV Column_45 counts
5 3 Counts of protons .GE. 6 MeV Column_50 counts
6 3 Counts of electrons 600-860 keV Column_55 counts
Particle type
Ion
Quantity
Counts
Qualifier
Average
Energy range
Low energy
65
High energy
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
11 minutes
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.

Elements
Index Name Parameter key Units
1 6 Sector 1 counts of Q.GE.1, .GE.160 keV/Q ions Column_63 counts
2 6 Sector 1 Counts of Q.GE.1, 550-900 keV/Q ions Column_72 counts
3 6 Sector 1 counts of Q.GE.1, 390-600 keV/Q ions Column_81 counts
4 6 Sector 1 counts of Q.GE.1, 130-210 keV/Q ions Column_90 counts
5 6 Sector 1 Counts of Q.GE.4, 390-600 keV/Q Column_99 counts
6 6 Sector 1 Counts of 600-860 keV electrons Column_108 counts
7 6 Sector 1 Counts of Q.GE.1, 740-1200 keV/Q Column_117 counts
8 6 Sector 1 Counts of Q.GE.2, 65-100 keV/Q Column_126 counts
9 6 Sector 1 Counts of Q.GE.6, 37-55 keV/Q Column_135 counts
Particle type
Ion
Quantity
Counts
Qualifier
Average
Energy range
Low energy
65
High energy
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
11 minutes
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.

Elements
Index Name Parameter key Units
1 3 Sector 0 counts of Q.GE.6, 37-55 keV/Q ions analyzed (P1) Column_140 counts
2 3 Sector 0 counts of Q.GE.2, 65-100 keV/Q ions analyzed (P2) Column_150 counts
3 3 Sector 0 counts of Q.GE.4, 65-100 keV/Q ions analyzed (P2") Column_160 counts
4 3 Sector 0 counts of Q.GE.1, 130-210 keV/Q ions analyzed (P3) Column_170 counts
5 3 Sector 0 counts of Q.GE.1, 160-230 keV/Q ions analyzed (P4) Column_180 counts
6 3 Sector 0 counts of Q.GE.1, .GE.160 keV/Q ions analyzed (P5) Column_190 counts
7 3 Sector 0 counts of Q.GE.1, 390-600 keV/Q ions analyzed(P6) Column_200 counts
8 3 Sector 0 counts of Q.GE.1, 550-900 keV/Q ions analyzed (P7) Column_210 counts
9 3 Sector 0 counts of Q.GE.2, 550-900 keV/Q ions analyzed(P7') Column_220 counts
10 3 Sector 0 counts of Q.GE.1, 740-1200 keV/Q ions analyzed (P8) Column_230 counts
Particle type
Ion
Quantity
Counts
Qualifier
Average
Energy range
Low energy
37
High energy
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
11 minutes
Structure
Size
33
Description

List of 33 counts of events analyzed, by event type and charge group

Elements
Index Name Parameter key Units
1 Counts of events analyzed, P1, Q:5-8 Column_238 counts
2 Counts of events analyzed, P1, Q.GE.13 Column_239 counts
3 Counts of events analyzed, P1, BG-Low Column_240 counts
4 Counts of events analyzed, P1, BG-High Column_241 counts
5 Counts of events analyzed, P2, Q=2 Column_242 counts
6 Counts of events analyzed, P2, BG-Low Column_243 counts
7 Counts of events analyzed, P2", Q:5-8 Column_244 counts
8 Counts of events analyzed, P2", Q.GE.13 Column_245 counts
9 Counts of events analyzed, P2", BG-High Column_246 counts
10 Counts of events analyzed, P3, Q=1 Column_247 counts
11 Counts of events analyzed, P3, Q=2 Column_248 counts
12 Counts of events analyzed, P3, Q:5-8 Column_249 counts
13 Counts of events analyzed, P3, BG-High Column_250 counts
14 Counts of events analyzed, P4, Q=1 Column_251 counts
15 Counts of events analyzed, P4, Q=2 Column_252 counts
16 Counts of events analyzed, P4, Q:5-8 Column_253 counts
17 Counts of events analyzed, P4, BG-High Column_254 counts
18 Counts of events analyzed, P5, BG-Low Column_255 counts
19 Counts of events analyzed, P5, BG-High Column_256 counts
20 Counts of events analyzed, P6, Q=1 Column_257 counts
21 Counts of events analyzed, P6, Q=2 Column_258 counts
22 Counts of events analyzed, P6, Q:5-8 Column_259 counts
23 Counts of events analyzed, P6, BG-Low Column_260 counts
24 Counts of events analyzed, P6, BG-High Column_261 counts
25 Counts of events analyzed, P7, Q=1 Column_262 counts
26 Counts of events analyzed, P7', Q=2 Column_263 counts
27 Counts of events analyzed, P7', Q:5-8 Column_264 counts
28 Counts of events analyzed, P7', BG-High Column_265 counts
29 Counts of events analyzed, P8, Q=1 Column_266 counts
30 Counts of events analyzed, P8, Q=2 Column_267 counts
31 Counts of events analyzed, P8, Q:5-8 Column_268 counts
32 Counts of events analyzed, P8, BG-Low Column_269 counts
33 Counts of events analyzed, P8, BG-High Column_270 counts
Particle type
Ion
Quantity
Counts
Qualifier
Average
Energy range
Low energy
37
High energy
1200
Units
keV/Q

Parameter #5

Name
Spacecraft position vector
Description

GSE X,Y,Z components of spacecraft position vector, in km.

Cadence
11 minutes
Structure
Size
3
Description

GSE X,Y,Z components of spacecraft position vector, in km.

Elements
Index Name Qualifier Parameter key Units
1 X Component, GSE Component I Column_07 km
2 Y Component, GSE Component J Column_08 km
3 Z Component, GSE Component K Column_09 km
Parameter type
Positional

SPASE version 2.0.0

Instrument: Solid-State Detectors

Instrument ID
spase://SMWG/Instrument/IMP8/EECA Get XML
Name
Solid-State Detectors
Description

This experiment was designed to determine the composition and energy spectra of low-energy particles observed during solar flares and 27-d recurrent events. The detectors used included (1) an electrostatic analyzer (to select particles of the desired energy per charge) combined with an array of windowless solid-state detectors (to measure the energy loss) and surrounded by an anticoincidence shield, and (2) a thin-window proportional counter, solid-state particle telescope. The experiment measured particle energies from 0.1 to 10 MeV per charge in 12 bands and uniquely identified positrons and electrons as well as nuclei with charges of Z from 1 to 8 (no charge resolution for Z greater than 8). Two 1000-channel pulse-height analyzers, one for each detector, were included in the experiment payload.

Additional information
NSSDC's Master Catalog

Information about the Solid-State Detectors experiment on the IMP-J mission.

Contact
Role Person
1. Principal investigator Fred M. Ipavich Get XML
Release date
2009-05-20 21:10:02
Instrument type
Energetic Particle Instrument
Investigation name
Solid-State Detectors on IMP-J
Observatory
IMP 8 Get XML

SPASE version 2.2.0

Observatory: IMP 8

Observatory ID
spase://SMWG/Observatory/IMP8 Get XML
Name
IMP 8
Alternate name
IMP-J
Explorer 50
1973-078A
Description

IMP 8 (IMP-J or Explorer 50), the last satellite of the IMP series, was a drum-shaped spacecraft, 135.6 cm across and 157.4 cm high, instrumented for interplanetary and magnetotail studies of cosmic rays, energetic solar particles, plasma, and electric and magnetic fields. Its initial orbit was more elliptical than intended, with apogee and perigee distances of about 45 and 25 earth radii. Its eccentricity decreased after launch. Its orbital inclination varied between 0 deg and about 55 deg with a periodicity of several years. The spacecraft spin axis was normal to the ecliptic plane, and the spin rate was 23 rpm. The data telemetry rate was 1600 bps. The spacecraft was in the solar wind for 7 to 8 days of every 12.5 day orbit. Telemetry coverage was 90% in the early years, but only 60-70% through most of the 1980's and early 1990's. Coverage returned to the 90% range in the mid to late 1990's. The objectives of the extended IMP-8 operations were to provide solar wind parameters as input for magnetospheric studies and as a 1-AU baseline for deep space studies, and to continue solar cycle variation studies with a single set of well-calibrated and understood instruments. In October, 2001, IMP 8 was terminated as an independent mission. Telemetry acquisition resumed after about three months at Canberra only (30-50% coverage), as an adjunct to the Voyager and Ulysses missions. As of August 2005 IMP 8 continued in this mode.

Additional information
IMP-8 Project Information
NSSDC's Master Catalog

Information about the IMP-J mission

Contact
Role Person
1. Project scientist Dr. Robert E. McGuire Get XML
Release date
2010-09-27 18:45:12
Prior ID
spase://vspo/observatory/63
Observatory group
IMP Spacecraft Series Get XML
Location
Region
Earth.Magnetosheath
Earth.Magnetosphere.Magnetotail
Heliosphere.NearEarth

SPASE version 2.2.0

Observatory: IMP Spacecraft Series

Observatory ID
spase://SMWG/Observatory/IMP Get XML
Name
IMP Spacecraft Series
Description

The IMP spacecraft series. Prelaunch, the 10 IMP's were called IMP's A-J. 8 of them were intended for geocentric orbits (A-C, F-J) and 2 for selenocentric orbits (D,E). Prelaunch, the latter two were also called Anchored IMPs (AIMPs) A and B. After launch, the 8 intended for geocentric were also called IMPs 1-8 and the 2 intended for lunar orbit were called AIMP 1 and 2. Only IMP E = AIMP B = AIMP 2 achieved lunar orbit; IMP D = AIMP A = AIMP 1 went into a geocentric orbit. The mapping of prelaunch IMP letters to postlaunch Explorer numbers and IMP numbers was

IMP (prelaunch) IMP (postlaunch) Explorer
A 1 18
B 2 21
C 3 28
D 33
E 35
F 4 34
G 5 41
H 7 47
I 6 43
J 8 50

Contact
Role Person
1. Metadata contact Jan Merka Get XML
Release date
2010-10-06 18:37:16
Location
Region
Earth.Magnetosphere
Heliosphere.NearEarth

SPASE version 2.2.0

Person: Prof. George Gloeckler

Name
Prof. George Gloeckler
Organization
University of Maryland
Person ID
spase://SMWG/Person/George.Gloeckler Get XML

SPASE version 2.2.0

Person: Fred M. Ipavich

Name
Fred M. Ipavich
Organization
University of Maryland
Email
fred@soho.umd.edu
Person ID
spase://SMWG/Person/Fred.M.Ipavich Get XML
Release date
2010-08-05 17:35:46

SPASE version 2.2.0

Person: Ms. Tamara J. Kovalick

Name
Ms. Tamara J. Kovalick
Organization
GSFC-Code 672
Email
Tamara.J.Kovalick@nasa.gov
Phone
+1-301-286-9422
Person ID
spase://SMWG/Person/Tamara.J.Kovalick Get XML
Release date
2010-08-05 17:35:47

SPASE version 2.2.0

Person: Mr. Robert M. Candey

Name
Mr. Robert M. Candey
Organization
NASA Goddard Space Flight Center
Address
Code 672, Greenbelt, MD 20771, USA
Email
robert.m.candey@nasa.gov
Phone
1-301-286-6707
Person ID
spase://SMWG/Person/Robert.M.Candey Get XML
Release date
2010-08-05 17:35:47

SPASE version 2.2.0

Person: Dr. Robert E. McGuire

Name
Dr. Robert E. McGuire
Organization
NASA Goddard Space Flight Center
Address
Code 672, Greenbelt, MD 20771, USA
Email
mcguire@mail630.gsfc.nasa.gov
Phone
+1 301 286 7794
Person ID
spase://SMWG/Person/Robert.E.McGuire Get XML
Release date
2010-08-05 17:35:47

SPASE version 2.2.0

Person: Jan Merka

Name
Jan Merka
Organization
NASA Goddard Space Flight Center
Address
Code 672, Greenbelt, MD 20771, USA
Email
jan.merka@nasa.gov
Phone
+1 301 286 8751
Person ID
spase://SMWG/Person/Jan.Merka Get XML
Release date
2010-08-05 17:35:46

SPASE version 1.3.0

Repository: SPDF

Repository ID
spase://SMWG/Repository/NASA/GSFC/SPDF Get XML
Name
SPDF
Description

Space Physics Data Facility

Additional information
SPDF

Space Physics Data Facility

Contact
Role Person
1. General contact Ms. Tamara J. Kovalick Get XML
2. Technical contact Mr. Robert M. Candey Get XML
3. Project scientist Dr. Robert E. McGuire Get XML
Release date
2008-08-26 21:02:30
Prior IDs
spase://vspo/repository/61
spase://SMWG/Repository/SPDF
Access URL