Ulysses Anisotropy Telescopes Data Channels

The ATs report back ion counts which are stored in 13 different data channels. The channels vary both in energy sensitivity and temporal resolution. Some channels report spin averaged data whilst others report sectored data. The table below summarises each channel's characteristics. The sectored channels are highlighted in red
 
Channel No. Energy Range (MeV) No. of Sectors Best Time Resolution (s)
Protons Alphas Oxygen Sulphur
1
2
3
4
5
6
7
8
9
10
11
12
13		 0.7-0.9
0.9-1.3
1.3-2.2
2.2-3.6
3.6-6.7
0.7-1.3
1.3-2.2
2.2-3.6
3.6-6.7
-
-
-
-		 2.3-2.5
2.5-2.7
2.7-3.0
-
24-28
2.3-2.7
2.7-3.0
-
24-28
3.0-7.5
7.5-12.0
12-26
3.0-7.5		 20.5-21.5
21.5-22.5
22.5-23.5
-
-
20.5-22.5
22.5-23.5
-
-
23.5-63.0
63-65
65-240
23.5-63		 63-65
65-67
67-69
-
-
63-67
67-69
-
-
69-185
185-210
210-750
69-185		 Spin-averaged
Spin-averaged
Spin-averaged
Spin-averaged
Spin-averaged
8
8
8
8
Spin-averaged
Spin-averaged
Spin-averaged
4		 16
16
16
16
16
16
64
64
64
128
128
128
128

Notice that we may use channels 6 through 9 for anisotropy analysis. In the solar wind we exploit channel 7 data first since it is least affected by background problems but still has reasonably high fluxes to avoid counting statistics errors. At Jupiter we have used both channel 6 and channel 7 anisotropy data.
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Written by Nick Laxton 28/4/97