Measurement of the earthshine polarization in the B, V, R, and I bands as function of phase

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Volume 556 (August 2013)

A&A, 556 (2013) A117

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Table 2

Fractional polarization values (Q/I)_es for the earthshine from the mare and highland regions of all our measurements and corresponding typical statistical 1σ uncertainties Δ_noise.


Date	Phase	Q/I (highland) [%]				Q/I (mare) [%]
(2011)	(Sun-Earth-Moon)	B	V	R	I	B	V	R	I


07.03	31.5°	–	1.5	–	–	–	2.3	–	–
08.03	42.5°	4.0	3.4	2.3	–	5.4	4.6	3.5	–
02.10	73.0°	8.7	6.1	4.0	2.5	11.9	8.1	5.3	2.9
11.03	75.5°	9.7	6.9	4.5	–	12.9	8.7	6.4	–
03.10	85.5°	9.4	6.9	4.8	2.9	12.7	8.6	5.7	2.7
04.10	98.0°	9.1	6.9	5.0	3.4	11.9	8.6	6.1	3.7
05.10	109.5°	7.7	5.7	4.2	3.1	11.1	8.4	5.9	8.6^a


Statistical 1σ uncertainty Δ_noise [%]		0.2	0.2	0.2	0.2	0.4	0.3	0.3	0.3
Fit parameter q_max [%]		9.4	7.0	4.7	3.0	12.7	9.0	6.1	3.2
Stddev of data from fit σ_d−f [%]		0.22	0.13	0.10	0.21	0.24	0.13	0.22	–
Polarization efficiency ϵ [%]^b		36.6	34.3	32.7	30.7	54.3	50.8	48.5	45.6
ϵ corrected q_max,corr [%]		25.8	20.3	14.4	9.6	23.4	17.8	12.6	6.9

Notes. Also given is the fit parameter for q_maxsin²(α) derived in Sect. 5.2 and the standard deviation of the data points from the fit σ_d−f. The polarization efficiencies and are derived in Sect. 6 and the depolarization corrected values q_max,corr are given.

^(a)

Value affected by systematic errors due to high stray light level (see text).

^(b)

The uncertainty of ϵ is mainly a systematic offset estimated to be Δϵ = ± 3% (see text).

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