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Table 1.
Mean velocities and lifetimes.
| Feature | n | v [km s−1] | t [min] |
|---|---|---|---|
| PGs, inner penumbra | 546 | −0.7 ± 0.3 | 19 ± 8 |
| PGs, outer penumbra | 126 | −0.1 ± 0.7 | 20 ± 9 |
| Dark bodies of filaments | 566 | 3.6 ± 0.9 | 7 ± 3 |
| Border expansion | 74 | 0.5 ± 0.2 | 60 ± 23 |
| Border stationary | 18 | 0.0 ± 0.1 | 68 ± 32 |
| Border contraction | 20 | −2.2 ± 1.3 | 19 ± 9 |
| G-band bright points | 241 | 0.8 ± 0.7 | 16 ± 9 |
Notes. Symbols: n is the number of measurements, and v and t are the mean horizontal speed and duration of the features, respectively. A negative sign for v indicates motion towards the umbra, positive away from the umbra.
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