Plotting SIS intensities
Energy bands for each of the SIS instrumental ranges are given for all level 2 elements in the table below, and also in tab-delimited text format. The appropriate energy at which to plot the reported intensities depends on the particle spectra. However, the ‘bow-tie’ analysis (e.g., Van Allen et al., JGR 79, 3559, 1974) is a method of characterizing an instrument response by a geometry factor x DE (referred to as <G>) and a representative energy, <E>, which are approximately independent of the spectral index of the incident particle population. This allows one to calculate the particle intensity (for a given energy range) and plot it at an appropriate energy (<E>) without a priori knowledge of the incident spectrum.
Bow-tie analysis of the SIS response results in the values of <G> and <E> as given in the table below for each instrumental range and level 2 element (also given are the geometry factors and energy bands as used in the current level 2 processing). As the reported intensities are not calculated using this method, a normalization factor (ABT) must be multiplied by the intensities in order to utilize the bow-tie analysis. For example, one would multiply the reported range-0 He intensities by a factor of 1.13 and plot the result at an energy value of 4.32.
More information regarding the bow-tie analysis can be found in this SIS memo. Questions regarding this analysis should be directed to Christina Cohen.
|
GF (cm2 sr) |
Emin (MeV/n) |
Emax (MeV/n) |
<G> (cm2 sr MeV/n) |
<E> (MeV/n) |
ABT |
|
|
|
Helium |
|||||
|
0 |
42.8 |
3.43 |
4.74 |
49.58 ± 1.67 |
4.32 ± 0.036 |
1.131 ± 0.038 |
|
1 |
42.8 |
4.74 |
6.13 |
65.71 ± 2.30 |
5.62 ± 0.049 |
0.905 ± 0.032 |
|
2 |
41.2 |
6.13 |
7.29 |
53.90 ± 1.09 |
7.01 ± 0.035 |
0.887 ± 0.018 |
|
3 |
41.2 |
7.29 |
9.72 |
108.5 ± 4.07 |
8.84 ± 0.083 |
0.923 ± 0.035 |
|
4 |
39.0 |
9.72 |
13.59 |
154.8 ± 6.63 |
11.9 ± 0.13 |
0.975 ± 0.042 |
|
5 |
37.6 |
13.59 |
17.96 |
179.1 ± 6.21 |
16.1 ± 0.14 |
0.918 ± 0.032 |
|
6 |
32.2 |
17.96 |
29.35 |
401.5 ± 35.5 |
23.5 ± 0.52 |
0.913 ± 0.081 |
|
7 |
24.6 |
29.35 |
41.19 |
297.7 ± 12.3 |
35.1 ± 0.36 |
0.978 ± 0.040 |
|
|
Carbon |
|||||
|
0 |
42.8 |
6.12 |
8.62 |
114.4 ± 5.90 |
7.56 ± 0.097 |
0.821 ± 0.042 |
|
1 |
42.8 |
8.62 |
11.23 |
124.0 ± 4.58 |
10.3 ± 0.095 |
0.901 ± 0.033 |
|
2 |
41.2 |
11.23 |
13.40 |
102.0 ± 2.16 |
12.9 ± 0.068 |
0.876 ± 0.019 |
|
3 |
41.2 |
13.40 |
17.94 |
198.7 ± 7.39 |
16.3 ± 0.15 |
0.941 ± 0.035 |
|
4 |
39.0 |
17.94 |
25.12 |
287.7 ± 12.5 |
22.0 ± 0.24 |
0.973 ± 0.042 |
|
5 |
37.6 |
25.12 |
33.21 |
325.3 ± 11.2 |
29.7 ± 0.25 |
0.935 ± 0.032 |
|
6 |
32.2 |
33.21 |
54.30 |
745.2 ± 66.7 |
43.3 ± 0.97 |
0.911 ± 0.082 |
|
7 |
24.6 |
54.30 |
76.34 |
560.2 ± 23.7 |
64.9 ± 0.69 |
0.968 ± 0.041 |
|
|
Nitrogen |
|||||
|
0 |
42.8 |
6.61 |
9.33 |
125.5 ± 6.68 |
8.16 ± 0.11 |
0.837 ± 0.045 |
|
1 |
42.8 |
9.33 |
12.18 |
136.1 ± 5.14 |
11.1 ± 0.11 |
0.896 ± 0.034 |
|
2 |
41.2 |
12.18 |
14.56 |
110.7 ± 2.35 |
14.0 ± 0.074 |
0.886 ± 0.019 |
|
3 |
41.2 |
14.56 |
19.51 |
216.7 ± 8.17 |
17.7 ± 0.17 |
0.941 ± 0.035 |
|
4 |
39.0 |
19.51 |
27.34 |
314.9 ± 13.9 |
23.9 ± 0.26 |
0.970 ± 0.043 |
|
5 |
37.6 |
27.34 |
36.17 |
356.2 ± 12.2 |
32.3 ± 0.28 |
0.932 ± 0.032 |
|
6 |
32.2 |
36.17 |
59.19 |
808.7 ± 71.8 |
47.2 ± 1.05 |
0.917 ± 0.081 |
|
7 |
24.6 |
59.19 |
83.26 |
611.5 ± 26.2 |
70.7 ± 0.76 |
0.968 ± 0.041 |
|
|
Oxygen |
|||||
|
0 |
42.8 |
7.05 |
9.99 |
136.7 ± 7.56 |
8.71 ± 0.12 |
0.843 ± 0.047 |
|
1 |
42.8 |
9.99 |
13.07 |
146.6 ± 5.59 |
11.9 ± 0.11 |
0.899 ± 0.034 |
|
2 |
41.2 |
13.07 |
15.63 |
119.7 ± 2.59 |
15.0 ± 0.081 |
0.881 ± 0.019 |
|
3 |
41.2 |
15.63 |
20.97 |
234.0 ± 8.90 |
19.0 ± 0.18 |
0.940 ± 0.036 |
|
4 |
39.0 |
20.97 |
29.42 |
339.7 ± 15.1 |
25.7 ± 0.28 |
0.970 ± 0.043 |
|
5 |
37.6 |
29.42 |
38.94 |
383.5 ± 13.2 |
34.8 ± 0.30 |
0.933 ± 0.032 |
|
6 |
32.2 |
38.94 |
63.77 |
873.3 ± 78.0 |
50.8 ± 1.14 |
0.916 ± 0.082 |
|
7 |
24.6 |
63.77 |
89.78 |
661.1 ± 28.5 |
76.2 ± 0.82 |
0.968 ± 0.042 |
|
|
Neon |
|||||
|
0 |
||||||