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GALILEO

The Galileo Energetic Particles Detector

 

Galileo EPD Handbook

 

Appendices

 

Appendix E. EPD File Structure (continued)

 

7. Binned Rate Averages

Source: T. P. Armstrong, April 1985

 

This format will be used to obtain time averages of EPD rate data in physically significant coordinates. The coordinate orientations will be used:

 

  1. 1. Magnetic field--polar axis coincident with the magnetic field vector, x axis defined by the intersection of the plane normal to magnetic field and the Jovian equatorial plane in the sense opposite corotation. The y axis completes a right-handed coordinate system. These coordinates are shown in Figure 1.
  2. 2. Spacecraft-centered corotation coordinates--Polar axis along the corotation direction, x axis radially outward from Jupiter and the y axis completes the coordinate system. These coordinates are shown in Figure 2.

 

The count rate data will be binned into 14 nearly equal solid angle intervals in these two coordinate orientations. The bins are defined as follows:

 

I. Polar (0 <  theta <  31 deg.) (0 < phi < 360 deg.)

 

II. Midlatitude

 

a. (31 < theta < 73.4 deg.) (315 < phi < 45 deg.)
b. (31 < theta < 73.4 deg.) (45 < phi < 135 deg.)
c. (31 < theta < 73.4 deg.) (135 < phi < 225 deg.)
d. (31 < theta < 73.4 deg.) (225 < phi < 315 deg.)

 

III. Equatorial

 

a. (73.4 < theta < 106.6 deg.) (315 < phi < 45 deg.)
b. (73.4 < theta < 106.6 deg.) (45 < phi < 135 deg.)
c. (73.4 < theta < 106.6 deg.) (135 < phi < 225 deg.)
d. (73.4 < theta < 106.6 deg.) (225 < phi < 315 deg.)

 

IV. Midlatitude (South)

 

a. (106.6 < theta < 149. deg.) (315 < phi < 45 deg.)
b. (106.6 < theta < 149. deg.) (45 < phi < 135 deg.)
c. (106.6 < theta < 149. deg.) (135 < phi < 225 deg.)
d. (106.6 < theta < 149. deg.) (225 < phi < 315 deg.)

 

V. Antipolar (149 < theta < 180 deg.) (0 < phi < 360 deg.)

 

These binned data are stored in a clock defined as follows:

 

Item Contents
1 RECTYPE - A*4
   'MAG' Magnetic Orientation
   'SCC' Corotation Orientation
2 AXES (14) - I*4
Number of occurrences of the polar (magnetic, corotation) axis in the bins of the (corotation, magnetic) system.
3 Channel by channel rate quantities
Names: BINRATE(100,14,2)
Type: 4 byte real words
Contents:
 Third Index  
  1 Rate, counts/second
2 Rate uncertainty, statistical (counts/second)
 Second Index  
  1 Bin I
  2 Bin II a
  3 Bin II b
  4 Bin II c
  5 Bin II d
  6 Bin III a
  7 Bin III b
  8 Bin III c
  9 Bin III d
  10 Bin IV a
  11 Bin IV b
  12 Bin IV c
  13 Bin IV d
  14 Bin V
 First Index  
  1 A0 Summed
  2 A1 Summed
  3 A2 Summed
  4 A3 Summed
  5 A4 Summed
  6 A5 Summed
  7 A6 Summed
  8 A7 Summed
  9 A8
  10 DC0
  11 DC1
  12 DC2
  13 DC3
  14 E0 Summed
  15 E1 Summed
  16 E2 Summed
  17 E3 Summed
  18 F0 Summed
  19 F1 Summed
  20 F2 Summed
  21 F3 Summed
  22 B0
  23 B1
  24 B2
  25 CP1
  26 CP2
  27 CP3
  28 CA0
  29 CA1
  30 CA2
  31 CA3
  32 CA4
  33 CM0
  34 CM1
  35 CM2
  36 CM3
  37 CM4
  38 CM5
  39 CN0
  40 CN1
  41 CH0
  42 CH1
  43 CH2
  44 CH3
  45 CH4
  46 CH5
  47 CE1
  48 CE2
  49 CE3
  50 CP1P
  51 CP2P
  52 CP3P
  53 CA0P
  54 CA1P
  55 CA2P
  56 CA3P
  57 CA4P
  58 CM0P
  59 CM1P
  60 CM2P
  61 CM3P
  62 CM4P
  63 CM5P
  64 CN0P
  65 CN1P
  66 CH0P
  67 CH1P
  68 CH2P
  69 CH3P
  70 CH4P
  71 CH5P
  72 CE1P
  73 CE2P
  74 CE3P
  75 AS
  76 BS
  77 CS
  78 DS
  79 EB1
  80 EB2
  81 FB1
  82 FB2
  83 JA
  84 JB
  85 JC
  86 KS
  87 LS
  88 JAP
  89 JCP
  90 KP
  91 Spare
  92 Spare
  93 Spare
  94 Spare
  95 Spare
  96 Spare
  97 Spare
  98 Spare
  99 Spare
  100 Spare
4 Data presence/quality flags
Variable: IDP(100,14)
Units: None
Type: 2 byte integer
Contents:  
 Byte 2  
  0000 Data missing (not on EDR)
  0010 Data missing (wrong subcom pos.)
  0100 Data invalid (motor movement)
  0110 Data invalid (exceed max. rate)
  1000 Data invalid (discontinuity)
  1010 Data invalid (less than 2* bkg.)
  1100 Data invalid (physical inconsistency)
  1110 Data invalid (spare)
  0001 Data valid (nominal)
  0011 Data valid (high threshold)
  0101 Data valid (autocal. fault)
  0111 Data valid (interpolated)
  1001 Data valid (dead time corrected)
  1011 Data valid (unable to bkg correct)
  1101 Data valid (spare)
  1111 Data valid (spare)
 Byte 1 Unsigned integer # of samples in this average
 Second Index Bin Number
First Index Channel Number

 

 

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Updated 8/23/19, Cameron Crane

QUICK FACTS

Manufacturer: The Galileo Spacecraft was manufactured by the Jet Propulsion Laboratory, Messerschmitt-Bölkow-Blohm, General Electric, and the Hughes Aircraft Company.

Mission Duration: Galileo was planned to have a mission duration of around 8 years, but was kept in operation for 13 years, 11 months, and 3 days, until it was destroyed in a controlled impact with Jupiter on September 21, 2003.

Destination: Galileo's destination was Jupiter and its moons, which it orbitted for 7 years, 9 months, and 13 days.