IGC Spy

Glider FQ Thermal Info (18m Day 6)

		Thermal Time			Thermal Alt					Orbits Speed			Orbits Diam			Orbit Time			Climb Rate			Other
ID	Type	Start [hms]	End [hms]	Duration [hms]	Start [ft]	End [ft]	Delta [ft]	Lost [ft]	Lost [%]	Avg (stab) [kts]	Min (stab) [kts]	Max (stab) [kts]	Avg (stab) [m]	Min (stab) [m]	Max (stab) [m]	Avg (stab) [sec]	Min (stab) [sec]	Max (stab) [sec]	Avg (stab) [kts]	Min (stab) [kts]	Max (stab) [kts]	Direction	Track Length [km]	Count
0	All			00:57:12			30364	2145	7.1 %	82.8						26 blah			5.2					17
1	Thermal	03:18:04	03:20:00	00:01:56	6105	6919	813	55	6.9 %	81.1 80.8	61.7 80.7	97.4 81	385 397	343 385	410 410	29 30	26 29	31 31	4.1 4.6	2.9 4.3	4.8 4.8	Right	4.8	4
3	Orbit	03:18:04	03:18:34	00:00:30	6105	6328	223	13	5.9 %	82.3			0			30			4.4			Right	1.3
4	Orbit	03:18:34	03:19:03	00:00:29	6328	6564	236	6	2.8 %	81			0			29			4.8			Right	1.2
5	Orbit	03:19:03	03:19:34	00:00:31	6564	6791	226	9	4.3 %	80.7			0			31			4.3			Right	1.3
6	Orbit	03:19:34	03:20:00	00:00:26	6791	6919	127	26	20.5 %	80.5			0			26			2.9			Right	1.1
2	Thermal	03:20:04	03:23:06	00:03:02	6981	8645	1663	52	3.2 %	81.6 81.1	62.2 77.5	98.9 82.9	304 341	41 295	419 419	22.8 25.7	3 23	31 31	4.7 5.8	-1.3 3.6	6.6 6.6	Right	7.6	8
7	Orbit	03:20:04	03:20:29	00:00:25	6981	7171	190	16	8.6 %	83.2			0			25			4.5			Right	1.1
8	Orbit	03:20:29	03:20:52	00:00:23	7171	7421	249	0	0 %	82.4			0			23			6.4			Right	1
9	Orbit	03:20:52	03:21:15	00:00:23	7421	7677	255	3	1.3 %	78.3			0			23			6.6			Right	0.9
10	Orbit	03:21:15	03:21:40	00:00:25	7677	7923	246	0	0 %	77.5			0			25			5.8			Right	1
11	Orbit	03:21:40	03:22:07	00:00:27	7923	8192	269	0	0 %	82.9			0			27			5.9			Right	1.2
12	Orbit	03:22:07	03:22:32	00:00:25	8192	8461	269	0	0 %	82.8			0			25			6.4			Right	1.1
13	Orbit	03:22:32	03:23:03	00:00:31	8461	8651	190	26	13.8 %	82.6			0			31			3.6			Right	1.3
14	Orbit	03:23:03	03:23:06	00:00:03	8651	8645	-6	6	-100 %	83.1			0			03			-1.3			Right	0.1
3	Thermal	03:36:33	03:39:02	00:02:29	5928	7034	1105	213	19.3 %	80.9 81.2	60.6 80	98.5 82.3	328 379	107 335	433 433	24.8 28.5	8 25	33 33	4.6 4.4	2.1 2.1	6.5 6.5	Right	6.2	6
16	Orbit	03:36:33	03:37:00	00:00:27	5928	6148	219	9	4.5 %	78.8			0			27			4.8			Right	1.1
17	Orbit	03:37:00	03:37:25	00:00:25	6148	6420	272	36	13.3 %	81.8			0			25			6.5			Right	1.1
18	Orbit	03:37:25	03:37:53	00:00:28	6420	6627	206	45	22.2 %	80.6			0			28			4.4			Right	1.2
19	Orbit	03:37:53	03:38:21	00:00:28	6627	6840	213	36	16.9 %	82.3			0			28			4.5			Right	1.2
20	Orbit	03:38:21	03:38:54	00:00:33	6840	6958	118	78	66.7 %	80			0			33			2.1			Right	1.4
21	Orbit	03:38:54	03:39:02	00:00:08	6958	7034	75	6	8.7 %	81.6			0			08			5.6			Right	0.3
4	Thermal	03:42:47	03:46:17	00:03:30	6351	8218	1866	170	9.1 %	82.5 82.1	71.8 81.2	93.7 83.5	355 341	324 324	430 347	26.3 25.3	24 24	31 26	5.4 6	1.9 4.8	6.9 6.9	Right	8.9	8
23	Orbit	03:42:47	03:43:14	00:00:27	6351	6584	232	26	11.3 %	82.4			0			27			5.1			Right	1.1
24	Orbit	03:43:14	03:43:38	00:00:24	6584	6804	219	19	9 %	82.4			0			24			5.4			Right	1
25	Orbit	03:43:38	03:44:04	00:00:26	6804	7066	262	3	1.3 %	81.2			0			26			6			Right	1.1
26	Orbit	03:44:04	03:44:30	00:00:26	7066	7368	301	9	3.3 %	81.4			0			26			6.9			Right	1.1
27	Orbit	03:44:30	03:44:56	00:00:26	7368	7634	265	9	3.7 %	81.4			0			26			6.1			Right	1.1
28	Orbit	03:44:56	03:45:21	00:00:25	7634	7913	278	0	0 %	82.9			0			25			6.6			Right	1.1
29	Orbit	03:45:21	03:45:46	00:00:25	7913	8116	203	19	9.7 %	83.5			0			25			4.8			Right	1.1
30	Orbit	03:45:46	03:46:17	00:00:31	8116	8218	101	82	80.6 %	84.7			0			31			1.9			Right	1.4
5	Thermal	04:00:03	04:03:22	00:03:19	5954	8861	2906	39	1.4 %	85.4 84.4	75.2 81.5	96.2 88.4	348 341	321 321	381 362	24.9 24.7	23 23	26 25	8.7 8.8	5 7.8	11.5 9.6	Right	8.7	8
32	Orbit	04:00:03	04:00:28	00:00:25	5954	6440	485	9	2 %	87.4			0			25			11.5			Right	1.1
33	Orbit	04:00:28	04:00:53	00:00:25	6440	6847	406	0	0 %	81.5			0			25			9.6			Right	1
34	Orbit	04:00:53	04:01:16	00:00:23	6847	7204	357	0	0 %	85.2			0			23			9.2			Right	1
35	Orbit	04:01:16	04:01:41	00:00:25	7204	7585	380	0	0 %	81.5			0			25			9			Right	1
36	Orbit	04:01:41	04:02:06	00:00:25	7585	7946	360	6	1.8 %	84.7			0			25			8.6			Right	1.1
37	Orbit	04:02:06	04:02:31	00:00:25	7946	8313	367	6	1.8 %	85.1			0			25			8.7			Right	1.1
38	Orbit	04:02:31	04:02:56	00:00:25	8313	8641	328	3	1 %	88.4			0			25			7.8			Right	1.1
39	Orbit	04:02:56	04:03:22	00:00:26	8641	8861	219	13	6 %	89.4			0			26			5			Right	1.2
6	Thermal	04:10:34	04:12:12	00:01:38	6456	6899	442	203	45.9 %	78 74.7	62.3 74.7	102.5 74.7	419 355	355 355	507 355	32.7 29	29 29	37 29	2.9 4.4	-1.4 4.4	5.8 4.4	Left	4	3
40	Orbit	04:10:34	04:11:06	00:00:32	6456	6771	314	0	0 %	75.5			0			32			5.8			Left	1.2
41	Orbit	04:11:06	04:11:35	00:00:29	6771	6984	213	13	6.2 %	74.7			0			29			4.4			Left	1.1
42	Orbit	04:11:35	04:12:12	00:00:37	6984	6899	-85	190	-223.1 %	83.7			1000			37			-1.4			Left	1.6
7	Thermal	04:21:14	04:22:34	00:01:20	3900	4461	561	65	11.7 %	82.3 82.5	70.4 82.5	97.6 82.5	360 406	240 406	434 406	26.7 30	18 30	32 30	3.7 4	1.2 4	6 4	Right	3.4	3
44	Orbit	04:21:14	04:21:46	00:00:32	3900	4225	324	6	2 %	82.8			0			32			6			Right	1.4
45	Orbit	04:21:46	04:22:16	00:00:30	4225	4425	200	16	8.2 %	82.5			0			30			4			Right	1.3
46	Orbit	04:22:16	04:22:34	00:00:18	4425	4461	36	42	118.2 %	81.5			0			18			1.2			Right	0.8
8	Thermal	04:24:12	04:28:42	00:04:30	4786	7162	2375	229	9.7 %	81.8 81.3	69.1 78.8	103.4 83.6	362 365	311 311	411 411	27 27.4	24 24	30 30	5.2 5.7	0 4.8	6.6 6.6	Right	11.4	10
49	Orbit	04:24:12	04:24:36	00:00:24	4786	5055	269	6	2.4 %	81.2			0			24			6.6			Right	1
50	Orbit	04:24:36	04:25:00	00:00:24	5055	5301	246	16	6.7 %	79.2			0			24			6.1			Right	1
51	Orbit	04:25:00	04:25:25	00:00:25	5301	5534	232	9	4.2 %	78.8			0			25			5.5			Right	1
52	Orbit	04:25:25	04:25:53	00:00:28	5534	5810	275	26	9.5 %	80.5			0			28			5.8			Right	1.2
53	Orbit	04:25:53	04:26:22	00:00:29	5810	6135	324	3	1 %	81.2			0			29			6.6			Right	1.2
54	Orbit	04:26:22	04:26:51	00:00:29	6135	6420	285	0	0 %	81.9			0			29			5.8			Right	1.2
55	Orbit	04:26:51	04:27:18	00:00:27	6420	6696	275	0	0 %	81.9			0			27			6			Right	1.1
56	Orbit	04:27:18	04:27:45	00:00:27	6696	6912	216	3	1.5 %	83.1			0			27			4.8			Right	1.2
57	Orbit	04:27:45	04:28:15	00:00:30	6912	7162	249	3	1.3 %	83.6			0			30			4.9			Right	1.3
58	Orbit	04:28:15	04:28:42	00:00:27	7162	7162	0	160	0 %	86.7			0			27			0			Right	1.2
9	Thermal	04:31:58	04:33:33	00:01:35	6541	7112	570	68	12.1 %	85.2 83.7	73.7 83.5	96.2 84	329 370	223 344	396 396	23.8 27	15 25	29 29	3.1 4.4	-0.9 4.2	4.6 4.6	Right	4.1	4
59	Orbit	04:31:58	04:32:24	00:00:26	6541	6735	193	13	6.8 %	82.8			0			26			4.4			Right	1.1
60	Orbit	04:32:24	04:32:53	00:00:29	6735	6958	223	3	1.5 %	83.5			0			29			4.6			Right	1.2
61	Orbit	04:32:53	04:33:18	00:00:25	6958	7135	177	16	9.3 %	84			0			25			4.2			Right	1.1
62	Orbit	04:33:18	04:33:33	00:00:15	7135	7112	-22	36	-157.1 %	90.7			0			15			-0.9			Right	0.7
10	Thermal	04:38:32	04:44:51	00:06:19	4865	8602	3736	219	5.9 %	86.2 85.9	67.6 81	102.3 91.5	382 375	340 340	475 435	27.1 26.7	25 25	34 29	5.9 6.5	0.5 5	8.3 8.3	Right	16.8	14
63	Orbit	04:38:32	04:39:06	00:00:34	4865	5085	219	91	41.8 %	85.3			0			34			3.8			Right	1.5
64	Orbit	04:39:06	04:39:33	00:00:27	5085	5400	314	0	0 %	84.8			0			27			6.9			Right	1.2
65	Orbit	04:39:33	04:40:01	00:00:28	5400	5764	364	0	0 %	81			0			28			7.7			Right	1.2
66	Orbit	04:40:01	04:40:26	00:00:25	5764	6115	351	0	0 %	83			0			25			8.3			Right	1.1
67	Orbit	04:40:26	04:40:51	00:00:25	6115	6440	324	0	0 %	84			0			25			7.7			Right	1.1
68	Orbit	04:40:51	04:41:17	00:00:26	6440	6751	311	0	0 %	84.7			0			26			7.1			Right	1.1
69	Orbit	04:41:17	04:41:44	00:00:27	6751	7066	314	0	0 %	84.5			0			27			6.9			Right	1.2
70	Orbit	04:41:44	04:42:11	00:00:27	7066	7329	262	0	0 %	85.3			0			27			5.8			Right	1.2
71	Orbit	04:42:11	04:42:38	00:00:27	7329	7555	226	3	1.4 %	89.1			0			27			5			Right	1.2
72	Orbit	04:42:38	04:43:05	00:00:27	7555	7791	236	6	2.8 %	89.1			0			27			5.2			Right	1.2
73	Orbit	04:43:05	04:43:34	00:00:29	7791	8067	275	16	6 %	91.5			0			29			5.6			Right	1.4
74	Orbit	04:43:34	04:44:00	00:00:26	8067	8326	259	0	0 %	88.5			0			26			5.9			Right	1.2
75	Orbit	04:44:00	04:44:26	00:00:26	8326	8582	255	6	2.6 %	84.9			0			26			5.8			Right	1.1
76	Orbit	04:44:26	04:44:51	00:00:25	8582	8602	19	95	483.3 %	91.5			0			25			0.5			Right	1.2
11	Thermal	04:58:33	05:05:45	00:07:12	4294	8300	4005	200	5 %	75.7 75.4	61.6 71.3	86.5 79.9	334 347	132 315	380 380	27 28.1	10 26	30 30	5.1 5.8	-4.3 4.5	7 7	Left	16.8	16
79	Orbit	04:58:33	04:59:02	00:00:29	4294	4557	262	3	1.3 %	74.8			0			29			5.4			Left	1.1
80	Orbit	04:59:02	04:59:31	00:00:29	4557	4812	255	0	0 %	73.2			0			29			5.2			Left	1.1
81	Orbit	04:59:31	05:00:01	00:00:30	4812	5147	334	0	0 %	72.5			0			30			6.6			Left	1.1
82	Orbit	05:00:01	05:00:30	00:00:29	5147	5439	291	16	5.6 %	73			0			29			6			Left	1.1
83	Orbit	05:00:30	05:00:57	00:00:27	5439	5695	255	3	1.3 %	71.3			0			27			5.6			Left	1
84	Orbit	05:00:57	05:01:25	00:00:28	5695	5967	272	6	2.4 %	72.8			0			28			5.8			Left	1
85	Orbit	05:01:25	05:01:52	00:00:27	5967	6174	206	19	9.5 %	76.3			0			27			4.5			Left	1.1
86	Orbit	05:01:52	05:02:20	00:00:28	6174	6463	288	13	4.5 %	77.5			0			28			6.1			Left	1.1
87	Orbit	05:02:20	05:02:48	00:00:28	6463	6742	278	3	1.2 %	77.1			0			28			5.9			Left	1.1
88	Orbit	05:02:48	05:03:14	00:00:26	6742	7050	308	16	5.3 %	75.8			0			26			7			Left	1
89	Orbit	05:03:14	05:03:42	00:00:28	7050	7368	318	22	7.2 %	73.8			0			28			6.7			Left	1.1
90	Orbit	05:03:42	05:04:09	00:00:27	7368	7634	265	6	2.5 %	77			0			27			5.8			Left	1.1
91	Orbit	05:04:09	05:04:37	00:00:28	7634	7887	252	0	0 %	78			0			28			5.3			Left	1.1
92	Orbit	05:04:37	05:05:06	00:00:29	7887	8133	246	3	1.3 %	79.9			0			29			5			Left	1.2
93	Orbit	05:05:06	05:05:35	00:00:29	8133	8372	239	0	0 %	77.7			0			29			4.9			Left	1.2
94	Orbit	05:05:35	05:05:45	00:00:10	8372	8300	-72	85	-118.2 %	80.5			0			10			-4.3			Left	0.4
12	Thermal	05:10:32	05:12:22	00:01:50	7913	8914	1000	16	1.6 %	85.6 85.7	77.6 84.6	94.3 87.2	308 379	43 357	419 419	22 27	3 25	30 30	4.4 5.6	0 5.2	6.4 6.4	Right	4.8	5
96	Orbit	05:10:32	05:10:58	00:00:26	7913	8146	232	3	1.4 %	84.3			0			26			5.3			Right	1.1
97	Orbit	05:10:58	05:11:24	00:00:26	8146	8428	282	0	0 %	84.6			0			26			6.4			Right	1.1
98	Orbit	05:11:24	05:11:49	00:00:25	8428	8651	223	3	1.5 %	87.2			0			25			5.3			Right	1.1
99	Orbit	05:11:49	05:12:19	00:00:30	8651	8914	262	9	3.8 %	85.3			0			30			5.2			Right	1.3
100	Orbit	05:12:19	05:12:22	00:00:03	8914	8914	0	0	0 %	86.6			0			03			0			Right	0.1
13	Thermal	05:14:04	05:18:48	00:04:44	8681	11551	2870	22	0.8 %	87.8 87.3	68.8 84.5	100.9 89.9	370 394	181 360	427 427	25.8 27.6	12 26	30 30	6.1 5.9	4.3 4.3	7.5 6.6	Right	12.8	11
101	Orbit	05:14:04	05:14:28	00:00:24	8681	8956	275	0	0 %	87.8			0			24			6.8			Right	1.1
102	Orbit	05:14:28	05:14:54	00:00:26	8956	9245	288	3	1.1 %	84.5			0			26			6.6			Right	1.1
103	Orbit	05:14:54	05:15:20	00:00:26	9245	9517	272	9	3.6 %	86.9			0			26			6.2			Right	1.2
104	Orbit	05:15:20	05:15:46	00:00:26	9517	9780	262	3	1.3 %	87.2			0			26			6			Right	1.2
105	Orbit	05:15:46	05:16:13	00:00:27	9780	10059	278	0	0 %	87.6			0			27			6.1			Right	1.2
106	Orbit	05:16:13	05:16:41	00:00:28	10059	10262	203	3	1.6 %	85.8			0			28			4.3			Right	1.2
107	Orbit	05:16:41	05:17:11	00:00:30	10262	10541	278	3	1.2 %	86.5			0			30			5.5			Right	1.3
108	Orbit	05:17:11	05:17:39	00:00:28	10541	10800	259	0	0 %	88.6			0			28			5.5			Right	1.3
109	Orbit	05:17:39	05:18:08	00:00:29	10800	11089	288	0	0 %	89.9			0			29			5.9			Right	1.3
110	Orbit	05:18:08	05:18:36	00:00:28	11089	11400	311	0	0 %	89.1			0			28			6.6			Right	1.3
111	Orbit	05:18:36	05:18:48	00:00:12	11400	11551	150	0	0 %	92.2			0			12			7.5			Right	0.6
14	Thermal	05:34:07	05:37:47	00:03:40	6482	8208	1725	127	7.4 %	85 84.2	74.4 83	100.8 86.1	383 377	349 354	453 423	27.5 27.3	25 26	31 30	4.7 4.9	1.6 4.1	6.6 6.3	Right	9.6	8
116	Orbit	05:34:07	05:34:32	00:00:25	6482	6761	278	0	0 %	85.4			0			25			6.6			Right	1.1
117	Orbit	05:34:32	05:34:58	00:00:26	6761	6998	236	19	8.3 %	84.6			0			26			5.4			Right	1.1
118	Orbit	05:34:58	05:35:24	00:00:26	6998	7273	275	3	1.2 %	83.8			0			26			6.3			Right	1.1
119	Orbit	05:35:24	05:35:51	00:00:27	7273	7467	193	22	11.9 %	83.6			0			27			4.2			Right	1.2
120	Orbit	05:35:51	05:36:17	00:00:26	7467	7693	226	3	1.4 %	83			0			26			5.2			Right	1.1
121	Orbit	05:36:17	05:36:46	00:00:29	7693	7893	200	6	3.3 %	84.2			0			29			4.1			Right	1.3
122	Orbit	05:36:46	05:37:16	00:00:30	7893	8123	229	3	1.4 %	86.1			0			30			4.5			Right	1.3
123	Orbit	05:37:16	05:37:47	00:00:31	8123	8208	85	68	80.8 %	89.1			0			31			1.6			Right	1.4
15	Thermal	05:43:37	05:44:46	00:01:09	6174	6561	387	39	10.2 %	83.1 83.1	71.7 82	100 84.2	470 470	390 390	551 551	34.5 34.5	29 29	40 40	3.2 3.2	2.2 2.2	4.1 4.1	Right	3	2
124	Orbit	05:43:37	05:44:17	00:00:40	6174	6453	278	22	8.2 %	84.2			1000			40			4.1			Right	1.7
125	Orbit	05:44:17	05:44:46	00:00:29	6453	6561	108	16	15.2 %	82			0			29			2.2			Right	1.2
16	Thermal	05:46:19	05:48:23	00:02:04	6171	6922	751	147	19.7 %	78.9 78.8	64.9 78.7	89.8 78.8	400 406	374 374	439 439	31 31.5	29 29	34 34	3.6 4.2	0.8 3.6	5.2 4.8	Left	5	4
126	Orbit	05:46:19	05:46:50	00:00:31	6171	6443	272	19	7.2 %	76.9			0			31			5.2			Left	1.2
127	Orbit	05:46:50	05:47:19	00:00:29	6443	6676	232	26	11.3 %	78.7			0			29			4.8			Left	1.2
128	Orbit	05:47:19	05:47:53	00:00:34	6676	6883	206	49	23.8 %	78.8			0			34			3.6			Left	1.4
129	Orbit	05:47:53	05:48:23	00:00:30	6883	6922	39	52	133.3 %	81.1			0			30			0.8			Left	1.3
17	Thermal	05:50:56	05:57:51	00:06:55	6253	9832	3579	272	7.6 %	86.8 86.3	66.6 84.1	102.9 88.5	393 391	344 344	453 453	27.7 27.6	25 25	32 32	5.2 5.4	0.8 2.9	8.1 8.1	Right	18.5	15
130	Orbit	05:50:56	05:51:24	00:00:28	6253	6614	360	0	0 %	88.7			0			28			7.6			Right	1.3
131	Orbit	05:51:24	05:51:49	00:00:25	6614	6922	308	3	1.1 %	84.2			0			25			7.3			Right	1.1
132	Orbit	05:51:49	05:52:14	00:00:25	6922	7263	341	3	1 %	85.3			0			25			8.1			Right	1.1
133	Orbit	05:52:14	05:52:39	00:00:25	7263	7585	321	0	0 %	84.1			0			25			7.6			Right	1.1
134	Orbit	05:52:39	05:53:05	00:00:26	7585	7870	285	3	1.1 %	85.9			0			26			6.5			Right	1.1
135	Orbit	05:53:05	05:53:30	00:00:25	7870	8139	269	3	1.2 %	87.6			0			25			6.4			Right	1.1
136	Orbit	05:53:30	05:53:57	00:00:27	8139	8392	252	0	0 %	86.9			0			27			5.5			Right	1.2
137	Orbit	05:53:57	05:54:25	00:00:28	8392	8635	242	9	4.1 %	87.6			0			28			5.1			Right	1.3
138	Orbit	05:54:25	05:54:54	00:00:29	8635	8900	265	3	1.2 %	85.7			0			29			5.4			Right	1.3
139	Orbit	05:54:54	05:55:26	00:00:32	8900	9055	154	26	17 %	86.5			0			32			2.9			Right	1.4
140	Orbit	05:55:26	05:55:55	00:00:29	9055	9196	141	9	7 %	86.9			0			29			2.9			Right	1.3
141	Orbit	05:55:55	05:56:24	00:00:29	9196	9396	200	19	9.8 %	85.6			0			29			4.1			Right	1.3
142	Orbit	05:56:24	05:56:55	00:00:31	9396	9550	154	65	42.6 %	88.5			0			31			2.9			Right	1.4
143	Orbit	05:56:55	05:57:23	00:00:28	9550	9796	246	9	4 %	87.5			0			28			5.2			Right	1.3
144	Orbit	05:57:23	05:57:51	00:00:28	9796	9832	36	114	318.2 %	90.9			0			28			0.8			Right	1.3

Color of the track indicates climb rate
Width of the track indicates ground speed (not air speed)
Pink arrow indicates wind (not always reliable)
Fire indicates thermal source based on wind

IGC-SPY Gliders Competitions Flight LOG analysis (FQ)

Glider FQ Thermal Info (18m Day 6)

Color of the track indicates climb rate Width of the track indicates ground speed (not air speed) Pink arrow indicates wind (not always reliable) Fire indicates thermal source based on wind

Color of the track indicates climb rate
Width of the track indicates ground speed (not air speed)
Pink arrow indicates wind (not always reliable)
Fire indicates thermal source based on wind