Total mass of six quiescent prominences estimated from their multi-spectral observations

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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
4^b	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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