Table 2.
Start, end, and duration of the different regions of the in situ measured CME based on changes in the tendency of the SW speed for the different spacecraft. Last column compares the duration of the different regions at each spacecraft with respect to Wind.
| s/c | Region | Start (March 2012) | End (March 2012) | Duration | Δt wrt | |
|---|---|---|---|---|---|---|
| (day HH:MM UT) | (day HH:MM UT) | (min.) | Wind (min.) | |||
| Wind | #1 | 15 12:34 | 15 15:48 | 194 | – | |
| #2 | 15 15:48 | 15 20:46 | 298 | – | ||
| #3 | 15 20:46 | 16 09:14 | 748 | – | ||
| #4 | 16 09:14 | 16 14:21 | 308 | – | ||
| #5 | 16 14:21 | 16 23:52 | 570 | – | ||
| #6 | 16 23:52 | 17 21:57 | 1325 | – | ||
| #7 | 17 21:57 | 18 03:13 | 316 | – | ||
| #8 | 18 03:13 | 18 11:08 | 475 | – | ||
| A | 18 11:08 | 19 03:30 | 982 | – | ||
| ACE | #1 | 15 12:32 | 15 15:40 | 188 | −6 | |
| #2 | 15 15:40 | 15 21:03 | 323 | +25 | ||
| #3 | 15 21:03 | 16 08:12 | 669 | −79 | ||
| #4 | 16 08:12 | 16 14:27 | 375 | +67 | ||
| #5 | 16 14:27 | 16 22:32 | 485 | −85 | ||
| #6 | 16 22:32 | 17 22:00 | 1408 | +83 | ||
| #7 | 17 22:00 | 18 03:11 | 311 | −5 | ||
| #8 | 18 03:11 | 18 10:19 | 428 | −47 | ||
| A | 18 10:19 | 19 03:09 | 1010 | +28 | ||
| Cluster 1 | Magnetosphere | < 15 00:00 | 15 04:12 | – | – | |
| #1 | 15 13:08 | 15 16:27 | 199 | +5 | ||
| #2 | 15 16:27 | 15 21:53 | 326 | +28 | ||
| Interaction | 15 21:53 | 16 05:09 | 436 | – | ||
| Magnetosphere | 16 05:09 | 17 00:15 | 1146 | – | ||
| Interaction | 17 00:15 | 17 20:04 | 1189 | – | ||
| #6 | 17 20:04 | 17 21:50 | 106(*) | – (*) | ||
| #7 | 17 21:50 | 18 03:32 | 342 | 26 | ||
| Interaction | 18 03:32 | 18 08:24 | 291 | – | ||
| Magnetosphere | 18 08:24 | 19 06:54 | 1351 | – | ||
| STA | #1 | 15 22:29 | 16 00:44 | 135 | −59 | |
| #2 | 16 00:44 | 16 09:04 | 314 | −16 | ||
| #3 | 16 09:04 | 16 16:48 | 463 | −350 | ||
| #4 | 16 16:48 | 16 21:11 | 263 | +20 | ||
| #5 | 16 21:11 | 16 23:56 | 165 | −405 | ||
| #6 | 16 23:56 | 17 14:14 | 858 | −467 | ||
| #7 | 17 14:14 | 17 20:54 | 400 | +84 | ||
| #8 | 17 20:54 | 18 06:22 | 568 | −414 | ||
| Region | Description | |||||
| #1 | It starts with the shock and forms part of the sheath region. | |||||
| #2 | It is defined between a sudden enhancement of the bulk speed and the sudden depletion of this physical property. | |||||
| It is partially covering the sheath, and from the near-Earth observations, part of the magnetic obstacle of the structure too. | ||||||
| 3 | Expanding region. It has a clear FR structure at Earth, but not at STEREO-A. For Earth, it can be considered as a | |||||
| magnetic cloud (Nieves-Chinchilla et al. 2019), while for STEREO-A is considered part of the sheath (Jian et al. 2018). | ||||||
| #4 | Increasing speed from ∼625 to ∼700 km s−1 at Earth, and from ∼425 to ∼500 km s−1 at STEREO-A. | |||||
| #5 | The speed profile presents a ‘u’ shape or parabola behaviour. | |||||
| #6 | Speed remains more or less constant with a very fluctuating behaviour. | |||||
| #7 | It shows a gradual decrease of the speed with smooth behaviour for the three s/c, indicating an expansion. The magnetic | |||||
| field strength matches for all the observers. | ||||||
| #8 | Expanding region. | |||||
| A | Expanding region ending with a bulk speed plateau that ends up in a SIR (observed only near Earth). | |||||
| Interaction | It is a mixture of the magnetopause and the transit of the in situ CME. | |||||
Notes. (*)Comparison to Wind is not possible due to the previous interaction with the magnetosphere.
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