Analysis of signal to noise ratio in coronagraph observations of coronal mass ejections | Journal of Space Weather and Space Climate

Topical Issue - Space Weather Instrumentation

Open Access

Table 2

List of the CACTus results for the CME simulations. The columns give: simulation number, the SNR value at the brightest point of the GCS CME, the longitude of the CME relative to the observer (with 0 being a halo CME), an indication if the detection was successful and contained further detections, the median velocity including variation reported by CACTus for the main CME where detected, and the corresponding maximum velocity reported by CACTus. Where event detections are marked “As flow”, CACTus made a correct detection but reported it as a flow due to uncertainties. The velocity v _simu of the batches is the 3D-apex-velocity, and the POS-velocity reported by CACTus differs different depending on the relative longitude.

Simu. #	SNR	Stonyhurst longitude (degrees)	Detection	v _median (km s⁻¹)	v _max (km s⁻¹)
v _simu. = 700 km s⁻¹; 1% relative brightness
1	10	0	Success	290 ± 51	381
1	10	0	+5 CMEs	290 ± 51	381
2	4	0	Success	285 ± 51	381
			+3 CMEs
			+2 flows
3	2	0	Success	284 ± 51	381
			+3 CMEs
			+3 flows
4	1	0	Success	292 ± 49	381
4	1	0	+1 flow	292 ± 49	381
5	10	60	Success	574 ± 135	664
6	4	60	Success	574 ± 138	664
7	2	60	Success	553 ± 144	664
8	1	60	Success	574 ± 136	664
9	10	90	Success	628 ± 104	694
10	4	90	Success	625 ± 115	694
11	2	90	Success	631 ± 95	694
12	1	90	Success	625 ± 118	694
v _simu. = 700 km s⁻¹; 2% relative brightness
13	4	0	Success	290 ± 49	383
			+4 CMEs
			+4 flows
14	2	0	Success	284 ± 50	383
14	2	0	+9 flows	284 ± 50	383
15	1	0	Success	289 ± 47	383
15	1	0	+4 flows	289 ± 47	383
16	0.5	0	As flow	297 ± 48	434
17	4	60	Success	553 ± 150	664
18	2	60	Success	553 ± 146	664
19	1	60	Success	558 ± 136	664
20	0.5	60	As flow	615 ± 68	679
20	0.5	60	+1 CME	615 ± 68	679
21	4	90	Success	625 ± 113	686
22	2	90	Success	625 ± 125	686
23	1	90	Success	631 ± 95	694
24	0.5	90	As flow	631 ± 92	694
v _simu. = 1400 km s⁻¹; 1% relative brightness
25	4	0	Success	606 ± 90	743
			+1 CME
			+1 flow
26	2	0	Success	606 ± 92	743
26	2	0	+3 flows	606 ± 92	743
27	1	0	Success	606 ± 92	743
27	1	0	+1 flow	606 ± 92	743
28	0.5	0	As flow	606 ± 94	743
28	0.5	0	+1 flow	606 ± 94	743
29	4	60	Success	1077 ± 309	1358
30	2	60	Success	1077 ± 318	1358
30	2	60	+1 flow	1077 ± 318	1358
31	1	60	Success	1077 ± 307	1358
32	0.5	60	Success	1157 ± 206	1329
32	0.5	60	+1 flow	1157 ± 206	1329
33	4	90	Success	1250 ± 236	1388
34	2	90	Success	1250 ± 267	1388
35	1	90	Success	1263 ± 217	1388
36	0.5	90	Success	1263 ± 225	1488
v _simu. = 2100 km s⁻¹; 1% relative brightness
37	4	0	Success	946 ± 155	1179
38	2	0	Success	932 ± 159	1329
39	1	0	As flow	932 ± 154	1179
39	1	0	+1 CME	932 ± 154	1179
40	0.5	0	As flow	932 ± 156	1179
41	4	60	Legs only	(1050 ± 370)	1689
42	2	60	Legs only	(1000 ± 400)	1689
43	1	60	Legs only	(1000 ± 375)	1689
44	0.5	60	Legs as flows	(1400 ± 250)	1689
45	4	90	Legs only	(1200 ± 300)	1689
46	2	90	Legs only	(1000 ± 340)	1689
47	1	90	Legs only	(1000 ± 340)	1689
48	0.5	90	Legs only	(1450 ± 250)	1689
v _simu. = 700 km s⁻¹; 10% relative brightness
49	4	0	Success	290 ± 52	383
			+5 CMEs
			+12 flows
50	2	0	As flow	293 ± 51	416
50	2	0	+1 flow	293 ± 51	416
51	4	60	Success	558 ± 159	664
			+3 CMEs
			+9 flows
52	2	60	Success	568 ± 141	664
53	4	90	Success	600 ± 126	694
			+5 CMEs
			+6 flows
54	2	90	Success	625 ± 112	694

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