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

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Table 2

Observation numbers and times of SLS observations are listed in the first two columns.


Observ.	Date and time in UT	T	v _mt	τ₀(Hα)	i	j ₁	j ₂
No.	of SLS obs. in Hα	[1000 K]	[km s^-1]


	19 Apr. 2011
		6.3–15.0	6–21	0.3–5.9	0.39–0.93	0.45	0.50
1	06:55:12 –
		mean 9.9	mean 7.7	mean 0.93	mean 0.65
	–08:12:28
	5 May 2011
		6.4–15.0	6.7–14.9	0.25–2.3	0.51–0.89	0.55	0.00
2 large prom.	11:55:09 –
		mean 9.1	mean 10.4	mean 0.65	mean 0.62
	–12:00:43
2 small prom.^a	5 May 2011	—	—	—	0.8	0.8	0.0
	5 May 2011
		6.2–15.0	2.9–24.0	0.16–2.9	0.4–0.94	1.0	0.0
3	12:13:11 –
		mean 11.5	mean 9.7	mean 0.53	mean 0.62
	–12:21:03
	6 May 2011
		5.0–15.0	6.7–14.9	0.1–1.8	0.52–0.93	0.1	0.0
4^b	12:48:31 –
		mean 7.2	mean 10.4	mean 0.44	mean 0.63
	–12:54:19
	8 May 2011
		5.0–15.0	23.6–47.0	0.1–8.6	0.07–0.97	0.3	0.0
5	14:12:17 –
		mean 11.4	mean 31.4	mean 1.84	mean 0.7
	–14:16:16
	18 May 2011
		4.8–15.0	6.3–38.0	0.2–1.2	0.61–0.88	0.3	0.1
6	09:08:51 –
		mean 10.8	mean 11.1	mean 0.37	mean 0.69
	–11:50:32

Notes. The following quantities are listed in the next six columns: temperatures, velocities v_mt of microturbulence, optical thickness τ₀(Hα), ionisation degrees i of hydrogen obtained from GBO in Hα and Ca ii H, and values of ionisation degrees j₁, j₂ of helium estimated from comparing of the 193 Å and 335 Å based masses. For each prominence observation (except for the small prominence No. 2), intervals within which values of T, v_mt, τ₀(Hα), i vary in the prominence areas are listed. In rows under intervals, numbers preceded by the abbreviation “mean” are values averaged from whole prominence areas.

^(a)

The small prominence was visible only in AIA and X-ray XRT images, it was not seen in Hα slit-jaw image of the SLS spectrograph. Therefore, no times are shown for the SLS observations, just the date. Unique value of i for the whole prominence was estimated together with j₁ and j₂ by comparing the 193 Å and 335 Å based masses.

^(b)

The same prominence as the large one from observation No. 2.

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