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Table 1

Parameters of the selected impacts.

Impact Time Sun x,y I171 Column Mass V (ballist.) V (triang.) B+ B
(UT) (arcsec) (104 DN s-1) (1018 cm-2) (1012 g) (km s-1) (km s-1) (G) (G)

11 07:03:05 820, 30 77 3.6±0.2 232 145 6 5
2 07:03:53 630, –195 16 5.2±0.5 235 140180 5 6
3 07:03:53 720, –100 13 7.7±0.6 34 235 165 3 3
4 07:10:41 650, 30 6.8 5.0±0.5 12 265 150200 5 4
5 07:12:17 600, –20 11 3.0±0.5 275 5 4
6 07:16:17 735, 175 4.8 3.2±0.1 290 6 6
7 07:17:29 735, 145 2.8 3.0±0.1 290 4 6
8 07:21:05 485, –100 5.9 3.6±0.3 305 5 7
9 07:23:29 620, 245 89 6.6±0.4 23 310 250 6 30
10 07:26:17 415, –75 5.0 3.0±0.4 315 5 4
112 07:28:17 520, –80 21 2.6±0.3 320 6 6
12 08:07:53 405, –75 66 3.7±0.1 400 300 6 5
131 08:08:41 390, –65 220 3.7±0.1 23 405 300 6 5
14 08:50:48 300, 40 31 3.9±0.2 23 445 380 4 4
15 08:51:31 315, 120 49 <1.5 445 380 3 7
16 08:51:55 415, 65 10 2.2±0.2 450 380 3 3

Notes. I171 are the peak impact 171 Å channel intensities. The column densities are an estimate of the neutral hydrogen component 24 min before impact. The mass was computed by integrating the column densities in the falling plasma. The ballistic velocity assumes an ejection time from the surface 06:25:30 UT. The triangulation velocity is the velocity about 5 min before impact. The magnetic field strengths, B+ and B, are the average positive and negative field in the region around the impact. Marked impacts have been analysed by

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