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Table 3

Values of the α factor of coronal asymmetry and total mass estimated for the six multi-spectral observations of prominences.

Observ. Date and time in UT α 1σ error Mean H M 193 1σ error M335 − M193
No. of SLS obs. in Hα of mean α column density of M193
[%] [1018 cm-2] [109 kg] [%] [% of M193]
19 Apr. 2011
0.01–0.37 150.4 9.5 ≈ 290 15.8 −34.5
1 06:55:12 –
mean  0.02
– 08:12:28
5 May 2011
0.02–0.99 20.7 3.8 ≈ 670 20.7 −61.5
2 large prom. 11:55:09 –
mean  0.19
– 12:00:43
2 small prom.a 5 May 2011 0.2* 11.6 12.8 = 6.0 20.0 −91.6
5 May 2011
0.01–1.00 12.7 5.5 = 360 3.2 −5.5
3 12:13:11 –
mean  0.45
– 12:21:03
6 May 2011
0.01–0.14** 57.3 4.6 ≈ 370 18.0 −65.3
4b 12:48:31 –
mean  0.04
– 12:54:19
8 May 2011
0.02–0.92 68.0 7.0 ≈ 1100 7.7 −60.5
5 14:12:17 –
mean  0.24
– 14:16:16
18 May 2011
0.00–1.00 6.9 16.5 = 1700 3.4 −69.5
6 09:08:51 –
mean  0.29
– 11:50:32

Notes. Observation numbers and times of SLS observations are listed in the first two columns. Intervals within which α varies plus its average values are listed (introduced by “mean”) in Col. 3. The following quantities are shown in the next five columns: the 1σ errors of average α due to possible data errors (explained in detail in the text), mean column densities of hydrogen, the total masses estimated from the AIA 193 Å observations, the 1σ errors and differences between masses calculated from the AIA 335 Å and 193 Å observations. Values of mass preceded by the “=” symbol were calculated using the τ193-maps; values preceded by the “≈” were calculated using average τ193 values for whole prominence areas.

(a)

Small prominence was visible only in AIA EUV and XRT images.

(b)

Same prominence as the large one from observation No. 2.

(*)

Outside the black pixels a unique α value of 0.2 was estimated. Thus, no interpolation was necessary and α of 0.2 was used for the whole prominence area.

(**)

Bilinear interpolation of black pixels in the α map using the Cartesian instead of radial coordinate system.

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