Table 1.
Estimated radial velocity (vr) of the CME ejecta leading edge on 3 April 2010.
| Method (a) | Spacecraft | Imager | λ(b) [°] | Φ(b) [°] | vr [km s−1] |
||
|---|---|---|---|---|---|---|---|
| at 15:29 UT (D(b)≈30 R⊙) | at 22:49 UT (D(b)≈60 R⊙) | Mean vr(c) | |||||
| MCT | STEREO-A/B | HI1 | ≈0 | 7 | 877 ± 33 | 834 ± 29 | 855 ± 33 |
| Results of other methods in other publications | |||||||
| FP(1) | STEREO-A | HI1 | 0 | 9 | 950 ± 150 (d) | 950 ± 150 (d) | − |
| FP(2) | STEREO-A | HI1/HI2 | 0 | 3 ± 4 | 800 ± 100 (d) | 850 ± 100 (d) | 829 ± 122 |
| FP(3) | STEREO-A | HI1 | 0 | 5 ± 2 | ≈800 (d) | ≈700 (d) | − |
| HM(1) | STEREO-A | HI1 | 0 | −5 | 950 ± 150 (d) | 950 ± 150 (d) | − |
| HM(2) | STEREO-A | HI1/HI2 | 0 | −25 ± 10 | 750 ± 100 (d) | 950 ± 100 (d) | 854 ± 100 |
| HM(3) | STEREO-A | HI1 | 0 | 6 ± 2 | ≈800 (d) | ≈900 (d) | − |
| FP/HM(4) | STEREO-A | HI1 | 0 | −8 | 1100 ± 100 (d) | 950 ± 100 (d) | − |
| GT(5) | STEREO-A/B | HI1 | 0 | 10 | 900 ± 150 (d) | 750 ± 200 (d) | − |
| SSEF(6) | STEREO-A | HI1/HI2 | 0 | −19 | − | − | 915 |
| Results of HELCATS((e), 7, 8) | |||||||
| FP | STEREO-A | HI1/HI2 | −2 | 0 | − | − | 889 ± 17 |
| FP | STEREO-B | HI1/HI2 | −5 | 34 | − | − | 1149 ± 106 |
| HM | STEREO-A | HI1/HI2 | −2 | −20 | − | − | 962 ± 24 |
| HM | STEREO-B | HI1/HI2 | −3 | 69 | − | − | 1368 ± 213 |
| SSEF | STEREO-A | HI1/HI2 | −2 | −10 | − | − | 927 ± 20 |
| SSEF | STEREO-B | HI1/HI2 | −5 | 51 | − | − | 1248 ± 150 |
Notes.
The full names of the abbreviations of the methods are listed below, MCT: maximum correlation-coefficient localization and cross-correlation tracking technique, FP: fixed-Φ fitting method, HM: harmonic mean fitting method, GT: geometric rriangulation method, SSEF: self-similar expansion fitting method.
λ, Φ and D are the latitude, longitude, and heliocentric distance, respectively, in HEE coordinates.
The mean velocity of MCT method is calculated for a heliocentric distance (D) between 30 R⊙ and 60 R⊙, while for the other methods, the mean velocity is derived by fitting the whole trace of the leading edge in HI images.
Data is obtained from the Heliospheric Imager CME catalog and the CME kinematics catalog of HEliospheric Cataloging, Analysis and Techiques Service (HELCATS) (https://www.helcats-fp7.eu/index.html).
References. (1) Möstl et al. (2010); (2) Rollett et al. (2012); (3) Volpes & Bothmer (2016); (4) Xie et al. (2012); (5) Liu et al. (2011); (6) Möstl et al. (2014); (7) Davies et al. (2013); (8) Barnes et al. (2019).
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