Fundamental Technologies

Galileo Spacecraft Pages

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
1General Plasma Diagnostics
 
Name:GPD(30,3)
Type:4 byte reals except for 2nd subscript=3, which is 4 byte integer.
First Index: Description
1Ion number density
2Electron number density
3Ion thermal energy
4Electron thermal energy
5Plasma thermal energy/magnetic field energy density
6Ion convection speed
7Ion convection angle, theta, RTN
8Ion convection, phi, RTN
9Plasma density gradient, magnitude
10Plasma density gradient angle, theta, RTN
11Plasma density gradient angle, phi, RTN
12Proton/alpha ratio, low energy
13Proton/alpha ratio, high energy
14Alpha/medium ratio, low energy
15Alpha/medium ratio, high energy
16Medium/heavy ratio, low energy
17Medium/heavy ratio, high energy
18spare
19spare
20spare
21spare
22spare
23spare
24spare
25spare
26spare
27spare
28spare
29spare
30spare
Index 
1The item as calculated, physical units.
2Uncertainty in the item.
3Data presence/quality flag for item
Bytes 1 and 2 - Unsigned integer # of samples entering this calculation
Byte 2 
0000Data missing (not on EDR)
0010Data missing (wrong subcom pos.)
0100Data invalid (motor movement)
0110Data invalid (exceed max. rate)
1000Data invalid (discontinuity)
1010Data invalid (less than 2 * bkg.)
1100Data invalid (physical inconsistency)
1110Data invalid (spare)
0001Data valid (nominal)
0011Data valid (high threshold)
0101Data valid (autocal. fault)
0111Data valid (interpolated)
1001Data valid (dead time corrected)
1011Data valid (unable to bkg correct)
1101Data valid (spare)
1111Data valid (spare)
2Channel 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  
3Data 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

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Updated 10/12/04, T. Hunt-Ward
tizby@ftecs.com