Table 1.
Full list of all measurement flights conducted within the WIPAFF project.
| Flight code | Date (dd.mm.yyyy) | Start Time (UTC) | End Time (UTC) | WS (m s−1) | Wind dir (°) | Wake length (km) | Atmospheric stratification |
|---|---|---|---|---|---|---|---|
| September | |||||||
| Flight 1 | 06.09.2016 | 14:13 | 17:20 | 7 | 190 | 25 | stable |
| Flight 2 | 07.09.2016 | 09:25 | 13:00 | 4 | 210 | 20 | stable |
| Flight 3 | 07.09.2016 | 10:00 | 14:00 | 4 | 190 | at least 10 | stable |
| Flight 4 | 08.09.2016 | 10:38 | 14:25 | 8 | 120 | at least 40 | stable |
| Flight 5 | 09.09.2016 | 10:54 | 14:50 | 6 | 240 | at least 45 | stable |
| Flight 6 | 09.09.2016 | 15:43 | 19:17 | 6 | 250 | at least 5 | unstable |
| Flight 7 | 10.09.2016 | 07:30 | 11:30 | 7 | 190 | 45 | stable |
| Flight 8 | 10.09.2016 | 12:05 | 16:00 | 4 | 190 | at least 20 | stable |
| March–April | |||||||
| Flight 1 | 30.03.2017 | 15:57 | 19:02 | 15 | 240 | 70 | stable |
| Flight 2 | 31.03.2017 | 15:36 | 19:00 | 13 | 180 | 50 | stable |
| Flight 3 | 05.04.2017 | 15:42 | 16:34 | 14 | 310 | 10 | neutral |
| Flight 4 | 06.04.2017 | 15:29 | 18:22 | 8 | 310 | at least 10 | unstable |
| Flight 5 | 09.04.2017 | 12:36 | 16:07 | 7 | 220 | at least 50 | stable |
| Flight 6 | 09.04.2017 | 16:32 | 20:12 | 4 | 200 | n.a. | stable |
| Flight 7 | 11.04.2017 | 11:25 | 15:10 | 8 | 300 | 5 | unstable |
| Flight 8 | 11.04.2017 | 16:12 | 20:04 | 8 | 240–280 | 25 | neutral |
| Flight 9 | 13.04.2017 | 13:35 | 17:39 | 16 | 290 | 10 | neutral |
| May–June | |||||||
| Flight 1 | 17.05.2017 | 12:35 | 16:28 | 8 | 110 | n.a. | stable |
| Flight 2 | 17.05.2017 | 17:16 | 21:22 | 12 | 120 | 55 | stable |
| Flight 3 | 23.05.2017 | 15:42 | 16:34 | 5 | 250 | at least 25 | stable |
| Flight 4 | 23.05.2017 | 13:18 | 17:15 | 11 | 310 | at least 35 | neutral |
| Flight 5 | 24.05.2017 | 07:40 | 11:34 | 8 | 300 | n.a. | unstable |
| Flight 6 | 24.05.2017 | 12:13 | 16:11 | 9 | 270 | 5 | unstable |
| Flight 7 | 27.05.2017 | 09:57 | 13:58 | 10 | 150 | at least 50 | stable |
| Flight 8 | 27.05.2017 | 14:39 | 18:36 | 12 | 140 | 55 | stable |
| Flight 9 | 31.05.2017 | 09:58 | 13:46 | 8 | 290 | 2 | unstable |
| Flight 10 | 31.05.2017 | 15:00 | 18:50 | 9 | 290 | 0 | unstable |
| Flight 11 | 01.06.2017 | 08:55 | 12:54 | 6 | 300 | 0 | unstable |
| Flight 12 | 02.06.2017 | 08:55 | 12:40 | 4 | 170 | at least 15 | stable |
| August | |||||||
| Flight 1 | 08.08.2017 | 10:35 | 14:35 | 9 | 80 | at least 35 | stable |
| Flight 2 | 08.08.2017 | 15:06 | 19:07 | 14 | 80 | at least 55 | stable |
| Flight 3 | 09.08.2017 | 10:34 | 14:37 | 15 | 210 | n.a. | unstable |
| Flight 4 | 09.08.2017 | 15:09 | 19:05 | 13 | 240 | n.a. | unstable |
| Flight 5 | 10.08.2017 | 12:49 | 16:54 | 5 | 330 | n.a. | unstable |
| Flight 6 | 14.08.2017 | 12:08 | 16:07 | 8 | 150 | at least 35 | neutral |
| Flight 7 | 14.08.2017 | 16:40 | 20:31 | 7 | 120 | 50 | stable |
| Flight 8 | 15.08.2017 | 09:22 | 13:15 | 8 | 180 | 30 | stable |
| Flight 9 | 17.08.2017 | 08:06 | 12:10 | 12 | 160 | 40 | stable |
| October | |||||||
| Flight 1 | 14.10.2017 | 14:59 | 18:40 | 15 | 260 | n.a. | stable |
| Flight 2 | 15.10.2017 | 09:05 | 13:09 | 14 | 200 | n.a. | unstable |
| Flight 3 | 15.10.2017 | 13:52 | 17:50 | 13 | 190 | at least 25 | stable |
Wake length: Assessed wake distance with a wind speed deficit with more than 0.1 m s−1 compared to the undisturbed flow. Wake lengths measured during a flight pattern that did not cover the full extent of the wake are indicated with “at least”. Some flights focused on the processes above wind farms, hence, no data is available describing the length of the wakes, for such flights the wake length is not available (n. a.). Atmospheric stratification: Estimation of the atmospheric stability by analysing the airborne measured potential temperature vertical profiles between near surface (30 m) and hub height (100 m), which were flown close to the wind farm. WS means wind speed. Bold text marks the investigated flight in this study.