Table 2.
Characteristics of reversals and reversal combinations.
| Type | Epoch | Start | End | Time interval | Length | Speed | Spatial scale | cw/ | |
|---|---|---|---|---|---|---|---|---|---|
| (yr) | (yr) | (yr) | (yr) | (mas) | (c) | (mas) | ccw | ||
| 1 | Ra | 1996.78 | 1996.37 | 1998.41 | 2.03 (×2) | 0.14 (×2) | 4.37 | 0.12 | ccw |
| 2 | RCb | 1999.26 | 1998.41 | 2000.44 | 2.03 | 0.09 | 2.89 | 0.04 | ccw |
| 3 | R | 2001.61 | 2000.44 | 2003.74 | 3.29 | 0.22 | 4.22 | 0.14 | cw |
| 4 | R | 2005.20 | 2003.74 | 2005.71 | 1.97 | 0.13 | 4.27 | 0.06 | cw |
| 5 | R | 2006.68 | 2005.71 | 2007.17 | 1.46 | 0.12 | 5.27 | 0.10 | cw |
| 6 | R | 2008.48 | 2007.17 | 2009.09 | 1.92 | 0.08 | 2.75 | 0.05 | cw |
| 7 | R | 2009.66 | 2009.09 | 2010.07 | 0.98 | 0.08 | 5.24 | 0.05 | cw |
| 8 | R | 2015.05 | 2014.12 | 2017.31 | 3.18 | 0.17 | 3.47 | 0.10 | cw |
| 9 | R | 2017.65 | 2017.31 | 2018.31 | 1.00 | 0.08 | 4.98 | 0.05 | cw |
| 10 | R | 2019.49 | 2018.31 | 2019.64 | 1.34 | 0.12 | 5.76 | 0.07 | cw |
| 11 | R | 2020.16 | 2019.64 | 2021.14 | 1.50 | 0.11 | 4.79 | 0.08 | ccw |
| Meanc: | − | − | − | − | 1.87 ± 0.26 | 0.12 ± 0.01 | 4.36 ± 0.33 | 0.07 ± 0.01 | − |
Notes. The columns for reversals are as follows: reversal type; the epochs of the beginning and end of the reversal, ts and te; reversal time interval ΔtR = te − ts; length of the reversal ΔlR; speed of the QSC component βs; spatial scale, representing the largest extent of the reversal; and the direction of the reverse motion.
Only part of the reversal is observed. The length and time interval of the reversal are taken to be equal to twice the measured length and time interval.
This is a combo reversal, encompassing two smaller-scale reversals occurring at epochs 1999.26 and 2000.07, both exhibiting CCW motion (yellow line in Fig. 12, left panel). The pivot point of the combo reversal is identified at epoch 1999.26.
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