An atmospheric radiation model for Cerro Paranal - I. The optical spectral range

Free Access

Table 2

Basic properties of the Paranal airglow line and continuum (0.543 μm) variability as derived from the Patat (2008) spectral data set.

Property	Unit	[O I] 5577	Na I D	[O I] 6300, 6364	OH(7–0)–(6–2)	O₂(b-X)(0–1)	0.543 μm

h_layer	km	97	92	270	87	94	90
N_spec	–	1186	1046	1046	1046	839	874
⟨I⟩^a	phot s^-1 m^-2 arcsec^-2	3.6	0.81	3.5	60.	6.0	80.^b
		(1.6)	(0.48)	(3.4)	(19.)	(2.5)	(31.^b)
	R^c	190.	43.	190.	3200.	320.	4.3^d
		(90.)	(26.)	(180.)	(1000.)	(130.)	(1.6^d)
m_sun^e	sfu^-1	0.0087	0.0011	0.0068	0.0001	0.0063	0.0061
P_season,min^f	–	1	1	1	5	5	1
f_season,min	–	0.86	0.54	0.30	0.82	0.71	0.81
P_season,max^f	–	3	3	3	6	3	3
f_season,max	–	1.44	1.84	1.51	1.14	1.33	1.24

Notes.

^(a)

Mean intensity and variability (in parentheses) for solar cycles 19 to 23.

^(b)

In photons s^-1 m^-2 μm^-1 arcsec^-2.

^(c)

1 R (Rayleigh) ≈ 0.018704 phot s^-1 m^-2 arcsec^-2.

^(d)

In R nm^-1.

^(e)

Slope for solar activity correction relative to mean solar radio flux for cycles 19 to 23 ( ≈ 129 sfu).

^(f)

Two-month bin with minimum or maximum correction factor: 1 = Dec./Jan., 2 = Feb./Mar., 3 = Apr./May, 4 = Jun./Jul., 5 = Aug./Sep., 6 = Oct./Nov.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.