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 CRNC hourly energetic alpha particle fluxes

Resource ID
spase://VEPO/NumericalData/IMP8/CRNC/Helium_PT1H Get XML
Name
IMP 8 CRNC hourly energetic alpha particle fluxes
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.

Additional information
Readme file at SPDF
Comprehensive data descriptive file

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.

Acknowledgement

Acknowledge the late John A. Simpson, the original CRNC PI, and Clifford Lopate/UNH, current PI.

Contact
Role Person
1. Principal investigator Dr. Clifford Lopate Get XML
Release date
2011-08-31 00:00:00
Repository
Name
SPDF Get XML
Availability
Online
Access rights
Open
URL
SPDF FTP area

ftp access to alpha particle-specific subdirectory holding annual ASCII files

SPDF HTTP area

In CDF via HTTP from SPDF

FTPBrowser

Subset, plot and list fluxes of protons, alpha particles and electron, and count rates of heavies, via FTPBrowser

Multi-Source Spectral Plot

Spectral plots and power law fits for arbitrary durations

Format
Text
File size
1 MB per 1 year
Acknowledgement

Acknowledge C. Lopate, J. Simpson, and GSFC/SPDF (Space Physics Data Facility)

Instrument
Cosmic Ray Nuclear Composition Get XML
Measurement type
Energetic particles
Temporal description
Start date
1973-10-30 00:00:00
Stop date
2001-10-26 00:00:00
Cadence
1 hour
Observed regions
Heliosphere.NearEarth

Parameters

Parameter #1

Name
Time
Parameter key
Column_1-Column_3
Description

Time at start of flux average, as year, day, hour

Cadence
1 hour
Structure
Size
3
Description

year, day, hour

Parameter type
Temporal

Parameter #2

Name
Fractional Coverage
Parameter key
Column_4
Description

Fractional counting coverage (0-1) during this hour

Cadence
1 hour
Parameter type
Temporal

Parameter #3

Name
Alpha particle fluxes
Parameter key
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
1 hour
Units
1/sec-cm**2-ster-MeV/n
Structure
Size
9
Description

Array of fluxes at 9 energy windows

Particle type
AlphaParticle
Quantity
Number flux
AtomicNumber
2
Energy range
Low energy
10.90
High energy
94.81
Units
MeV/n

SPASE version 2.0.0

Instrument: Cosmic Ray Nuclear Composition

Instrument ID
spase://SMWG/Instrument/IMP8/CRNC Get XML
Name
Cosmic Ray Nuclear Composition
Description

This experiment used two telescopes to measure the composition and energy spectra of solar (and galactic) particles above about 0.5 MeV/nucleon. The main telescope consisted of five collinear elements (three solid state, one CsI, and one sapphire Cerenkov) surrounded by a plastic anticoincidence shield. The telescope had a 60-deg, full-angle acceptance cone with its axis approximately normal to the spacecraft spin axis, permitting eight-sectored information on particle arrival direction. Four elements of the main telescope were pulse-height analyzed, and low- and high-gain modes could be selected by command to permit resolution of the elements H through Ni or of electrons and the isotopes of H and He and light nuclei. A selection-priority scheme was included to permit sampling of less abundant particle species under normal and solar-flare conditions. The low-energy telescope was essentially a two-element shielded solid-state detector with a 70-deg full-angle acceptance cone. The first element was pulse-height analyzed, and data were recorded by sectors.

Additional information
NSSDC's Master Catalog

Information about the Cosmic Ray Nuclear Composition experiment on the IMP-J mission.

Contact
Role Person
1. Principal investigator Dr. Clifford Lopate Get XML
Release date
2009-05-20 21:10:02
Instrument type
Energetic Particle Instrument
Investigation name
Cosmic Ray Nuclear Composition 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: Dr. Clifford Lopate

Name
Dr. Clifford Lopate
Organization
University of New Hampshire
Person ID
spase://SMWG/Person/Clifford.Lopate Get XML

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