###Pioneer 11 Geiger Tube Telescope Calibrated Data Bundle

####Pioneer 11 GTT 1 Hour Count Rate Data Collection

    START_TIME                       = 1973-04-06T00:00:00.000
    STOP_TIME                        = 1991-06-06T23:59:59.999
    Original DATA SET RELEASE DATE   = 2009-02-27
    PRODUCER_FULL_NAME               = John F. Cooper

#####References:

Principal Investigator: Prof. James A. Van Allen, University of Iowa

Data Provider: Dr. John F. Cooper, NASA GSFC SPDF

***

####Collection Overview

Collection Coverage: 1973-04-06 to 1991-06-06

Hourly Average Interplanetary Cosmic Ray Data from the Pioneer 11
Geiger Tube Telescope (GTT) Experiment

The Pioneer 11 Geiger-Mueller Tube (GTT) experiment measures cosmic ray
and magnetospheric energetic electron and proton intensities in the energy
range of 0.04 MeV to 80 MeV. This collection consists of hourly averages of
selected interplanetary counting rates computed by NSSDC staff from 15-min.
averaged data in the full VMS binary data set 73-019A-11E in the NSSDC
tape archive. The hourly data are in annual files p11gt_hrYYYY.tab as described below.
This version of the hourly resolution data set was created in 2008 from
a predecessor version to better support the FTPBrowser. 

It differs from its predecessor in the following respects:

|----|----------------------------------------------------------------------------------------|
|(a) |the new data set has annual files while the predecessor had 6-month files               |
|(b) |the fill value was changed from -1.00E+31 to 1.00E+031                                  |
|(c) |there is a record for every hour in the new collection, even if there are no GTT data.  |


Data Parameters:

   NYY NDOY MHR MMN NSEC NTSAMP RATGG RATA RATB RATC RATD RSCS HLATSC

Data Parameter Definition:

|-----------------------------------------------|--------------------------------------------------------------------|
| Year (original name:NYY)                      |  YEAR (SCET)                                                       |
| Day of year (original name:NDOY)              |  DAY OF YEAR (SCET)                                                |
| Hour of S/C event time (original name:MHR)    |  HOUR                                                              |
| Minute of S/C event time (original name:MMN)  |  MINUTE                                                            |
| Second of S/C event time (original name:NSEC) |  SECONDS                                                           |
| NTSAM                                         |  DATA SAMPLES NORMALIZED TO 2048 BPS TELEMETRY RATE                |
| RATGG                                         |  G+G COUNTING RATE (PROTONS 0.61-3.41 MEV)                         |
| RATA                                          |  A CHANNEL COUNTING RATE (ELECTRONS > 5 MEV, PROTONS > 30 MEV)     |
| RATB                                          |  B CHANNEL COUNTING RATE (ELECTRONS > 0.04 MEV, PROTONS > 0.61 MEV)|
| RATC                                          |  C CHANNEL COUNTING RATE (ELECTRONS > 0.56 MEV, PROTONS > 9. MEV)  |
| RATD                                          |  D CHANNEL COUNTING RATE (ELECTRONS > 31 MEV, PROTONS > 80 MEV)    |
| RSCS                                          |  SUN-SPACECRAFT DISTANCE (AU)                                      |
| HLATS                                         |  HELIOGRAPHIC LATITUDE OF SPACECRAFT (DEGREES)                     |

Acknowledgement:

Use of these data in publications should be accompanied at minimum by
acknowledgements of the National Space Science Data Center and the responsible
Principal Investigator defined in the experiment documentation provided here.
Citation of NSSDC's Coordinated Heliospheric Observations (COHO) data base
would also be appreciated, so that other potential users will be made aware of
this service.