CASSINI In Space

 

Helix Nebula Banner Image
GALILEO

The Galileo Energetic Particles Detector

 

Galileo EPD Handbook

 

Appendices

 

Appendix E. EPD File Structure (continued)

 

6. Rate Calc Block

Source: T. P. Armstrong, March 1985

 

A number of useful physical quantities can be calculated from the EPD count rates. The following is a list of such items:

 

Item Description
1 General Plasma Diagnostics
Name: GPD(30,3)
Type: 4 byte reals except for 2nd subscript=3, which is 4 byte integer.
First Index: Description
1 Ion number density
2 Electron number density
3 Ion thermal energy
4 Electron thermal energy
5 Plasma thermal energy/magnetic field energy density
6 Ion convection speed
7 Ion convection angle, theta, RTN
8 Ion convection, phi, RTN
9 Plasma density gradient, magnitude
10 Plasma density gradient angle, theta, RTN
11 Plasma density gradient angle, phi, RTN
12 Proton/alpha ratio, low energy
13 Proton/alpha ratio, high energy
14 Alpha/medium ratio, low energy
15 Alpha/medium ratio, high energy
16 Medium/heavy ratio, low energy
17 Medium/heavy ratio, high energy
18 spare
19 spare
20 spare
21 spare
22 spare
23 spare
24 spare
25 spare
26 spare
27 spare
28 spare
29 spare
30 spare
Index  
1 The item as calculated, physical units.
2 Uncertainty in the item.
3 Data presence/quality flag for item
Bytes 1 and 2 - Unsigned integer # of samples entering this calculation
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)
2 Channel by Channel Flux Quantities
 
Name: FLUX(100,2)
Type: 4 byte real words
Contents: Second Index
  1 Flux, particles/(cm**s-sec-sr-keV) spin and step averaged, background corrected
  2 Flux uncertainty, statistical (particles/(cm**2-sec-sr-keV))
  3 Peak flux, particles/(cm**2-sec-sr-keV)
  4 Minimum flux, particles/(cm**2-sec-sr-keV)
  5 Peak sector, payload coords. (1-60)
  6 Peak step, payload coordinates (0-7)
  7 Pitch angle of peak sector and step
  8 Peak sector and step, theta SCC
  9 Peak sector and step, phi SCC
  10 Pitch angle of minimum sector and step
  11 Minimum sector and step, theta SCC
  12 Minimum sector and step, phi SCC
  13 Peak flux/minimum flux ratio
  14 Percent uncertainty in peak/minimum ratio
  First Index Description
  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  
3 Data Presence/Quality Flags
Variable: IDP(100)
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

 

 

Next: Binned Rate Averages 

 

Return to Galileo EPD Handbook Table of Contents Page.

Return to main Galileo Table of Contents Page.
Return to Fundamental Technologies Home Page.

 

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.