Data Products of the IMP-8 GME:

Full-Telemetry-Resolution (FTR) Data


 

1. Data Content and Usage (FTR Data)

This data product contains the full science content of the IMP-8 GME measurement set from launch to present. See the instrument description and data descriptions below for additional information.

 

2. Digital Data Access (FTR Data)

 

File organization and naming: Each binary file ("type" CNTS or "type" PHAS, abbreviated as "C" and "P" in the binary file names) covers a 4-day span of data. The files are additionally "g-zipped" to compress the data volume. File naming at this time combines the "type" specification with an "interval" number, where interval 101 starts on October 28 1973 and intervals increment sequentially to the present. The concept of intervals originated in the IMP-6 orbit and GME processing strategy. The concept of 4-day intervals was carried over to IMP-8 in the original implementation of the processing system. A table of interval <-> date conversions exists. So e.g. the file C1895.gz in fact includes "CNTS" data from 21-24 June 1993 inclusive.

File Formats:

Users should be aware these data are in a complex and encoded form that will be difficult to use without acquiring and mastering the software and detailed instrument behavior.

 

3. Analysis Software and Documentation (UNDER CONSTRUCTION):

The source code of all programs are written in Sun FORTRAN and/or C languages. These programs now operate under a Sun 4.1.4 operating system. A makefile which generates the object files and executable programs, is provided. A user's guide for each program provides the general description and input parameters needed. A shell program executes the program. Each program file contains the source codes of each routine, user's guide, makefile, IMP-8 catalog file, and I/O system "FTIO" package object file.

Type

Program and Link to User's Guide

Description

Link to Source Code

(Source codes are stored "G-zip'd" TAR files - please save as "source")

Pulse-Height Matrix Displays

HGPLT

High-Gain Plot:

Display of IMP8 GME LED and MED pulse-height data in matrix format for select 4-day intervals and special (pre-processed) times, plus distribution histograms used in setting MED gain shift factors

 

http://voyager.gsfc.nasa.gov/lo /imp8/hgplt.tar.gz

 

ANALIMPF

ANALIMP/ANALIMPF:

Display of IMP8 GME LED and MED pulse-height data in matrix format (any time span), plus "track-centered" histograms

http://voyager.gsfc.nasa.gov/lo /imp8/analimpf.tar.gz

 

Processed Parameters

(Rates and Fluxes)

RATEPLOT

Rate-Plot:

Access to all IMP-8 GME rates (LED, MED and VLET, including sectored rates and every readout mode)

http://voyager.gsfc.nasa.gov/lo /imp8/rateplot.tar.gz

FLUXPLOT & FLEXPLOT

Flux/Flex Plot:

Output of IMP-8 GME LED and MED fluxes from "intermediate flux/flex" format files of bin counts and normalizations.

Flux database uses narrower box definitions (most appropriate to galactic cosmic ray and quiet time studies) than the Flex database (which is most appropriate to interplanetary and solar energetic particle studies).

[UNDER CONSTRUCTION]

FOURIER

Fourier:

Sectored data (including fields with optional additional file inputs) and fitted anisotropies

http://voyager.gsfc.nasa.gov/lo /imp8/fourier.tar.gz

File Output

(PC formats)

PCPHA

PC-PHA:

Output of pulse-height data in the PC-PHA binary format

http://voyager.gsfc.nasa.gov/lo /imp8/pcpha.tar.gz

PCRATE

PC-RATE:

Output of rate and flux data (from "intermediate" flux or flex files) into the PC-Rate binary format

[UNDER CONSTRUCTION]

INTFLUX & INTFLEX

 

Intermediate Flux and Intermediate Flex:

Generate files in the flux or flex format for input to FLUXPLOT, FLEXPLOT and PC-RATE

[UNDER CONSTRUCTION]

Utilities

DBTIME

Data Base Time:

Time consistency and file quality check utility program

[UNDER CONSTRUCTION]

 

 

Overall Documentation, Processing Overview and Status (PARTIALLY COMPLETE ONLY)


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Return to the GME Data page (and access to additional data products)

Return to IMP-8 GME Home page

Questions or Comments


Contact Information

Questions about GME data and/or instrumentation should be directed to the NASA Principal Investigator:

 
Dr. Robert E. McGuire (at Robert.E.McGuire@nasa.gov)
Head, Space Physics Data Facility
Code 672
NASA/Goddard Space Flight Center
Greenbelt MD 20771 USA
 
Phone (with phonemail): 301-286-7794


Authors/Authorizing NASA Official and Curator

Dr. Robert McGuire (see above)
 
Howard A. Leckner,
Howard.A.Leckner@nasa.gov, (301) 286-9270
Space Physics Data Facility
NASA Goddard Space Flight Center
Greenbelt, MD 20771, USA


Last Modified: Wednesday 5/7/97 (REM)