Spatiotemporal change of sky polarization during the total solar eclipse on 29 March 2006 in Turkey: polarization patterns of the eclipsed sky observed by full-sky imaging polarimetry
Brigitta Sipoćz, Ramón Hegedüs, György Kriska, and Gábor Horváth
Brigitta Sipoćz, Ramón Hegedüs, György Kriska, and Gábor Horváth, "Spatiotemporal change of sky polarization during the total solar eclipse on 29 March 2006 in Turkey: polarization patterns of the eclipsed sky observed by full-sky imaging polarimetry," Appl. Opt. 47, H1-H10 (2008)
Using 180° field-of-view (full-sky) imaging polarimetry, we measured the spatiotemporal change of the polarization of skylight during the total solar eclipse on 29 March 2006 in Turkey. We present our observations here on the temporal variation of the celestial patterns of the degree p and angle α of linear polarization of the eclipsed sky measured in the red
, green
, and blue
parts of the spectrum. We also report on the temporal and spectral change of the positions of neutral (unpolarized,
) points, and points with local minima or maxima of p of the eclipsed sky. Our results are compared with the observations performed by the same polarimetric technique during the total solar eclipse on 11 August 1999 in Hungary. Practically the same characteristics of celestial polarization were encountered during both eclipses. This shows that the observed polarization phenomena of the eclipsed sky may be general.
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Color reversal films used were the following: K200 = Kodak Elite Chrome ED 200 ASA, K1600 = Kodak EPH 1600 ASA.
Numbers 1–13 in the first column indicate the numbers of scenes in Figs. 2–4.
k (%) of the sky for which 45° ≤ α ≤ 135° (from the local zenith meridian), degree of linear polarization p (%), and noisiness n (%) of the α-pattern of the sky during the total solar eclipse on 29 March 2006 measured by full-sky imaging polarimetry in Turkey in the red (650 nm), green (550 nm), and blue (450 nm) parts of the spectrum and averaged for the entire sky (average ± standard deviation).
Table 4
Degree of Linear Polarization p (%) Measured by Full-Sky Imaging Polarimetry in the Red (R, 650 nm), Green (G, 550 nm) and Blue (B, 450 nm) Parts of the Spectrum at the Celestial Points with p Extrema in Scene 3 of the Preeclipse and in Scenes 4–11 of Totality During the Solar Eclipse on 29 March 2006 in Turkeya
Scene
π1
π2
π3
η1
η2
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
Preeclipse
3
41–43
27–29
27–29
27–29
20–22
20–22
—
—
—
4–6
2–4
2–4
6–8
6–8
6–8
Eclipse (totality)
4
34–36
34–36
20–22
20–22
27–29
20–22
20–22
—
—
6–8
4–6
2–4
4–6
8–10
4–6
5
20–22
16–18
8–10
10–12
8–10
4–6
10–12
8–10
4–6
2–3
1–2
0–1
0–1
0–1
0–1
6
20–22
20–22
8–10
—
—
—
12–14
12–14
6–8
2–3
1–2
0–1
1–2
0–1
0–1
7
27–29
27–29
16–18
16–18
20–22
12–14
16–18
—
—
4–6
4–6
2–4
4–6
4–6
2–4
8
27–29
27–29
16–18
20–22
20–22
12–14
—
—
—
4–6
4–6
2–4
4–6
4–6
2–4
9
27–29
27–29
14–16
16–18
20–22
12–14
—
—
—
4–6
4–6
2–4
4–6
4–6
2–4
10
20–22
20–22
12–14
16–18
20–22
10–12
—
—
—
4–6
4–6
2–4
4–6
4–6
2–4
11
20–22
20–22
10–12
16–18
16–18
10–12
—
—
—
4–6
4–6
2–4
4–6
4–6
2–4
π1, π2, π3, local maxima of p; η1, η2, unpolarized (neutral) points (p = 0%–1%, bold) or local minima of p.
Tables (4)
Table 1
Parameters of the Total Solar Eclipse on 29 March 2006a
Date of total solar eclipse
29 March 2006
Diameter ratio
1.0494
Eclipse obscuration
1.1013
Solar zenith angle
46°
Solar azimuth angle
204°
Velocity of the umbra along the path of totality
846 m∕s
Major axis of the elliptical umbra
200 km
Minor axis of the elliptical umbra
164.1 km
Time of first contact (beginning of the partial eclipse)
12:38:22 (local summer time = UTC + 3)
Time of second contact (beginning of the total eclipse)
13:54:59
Time of midtotality
13:56:52
Time of third contact (end of the total eclipse)
13:58:44
Time of fourth contact (end of the partial eclipse)
15:13:34
Observation site
4 km from Side, Turkey, on the coast of the Mediterranean Sea
Latitude of observation site
36° 46′ N
Longitude of observation site
31° 23′ E
Diameter ratio = dMoon∕dSun, eclipse obscuration = AMoon∕ASun, where d and A are the diameter and the area of the Moon's and the Sun's disk.
Table 2
Parameters of Recordings of the Full-Sky Imaging Polarimetric Measurements during the Solar Eclipse on 29 March 2006 in Turkeya
Color reversal films used were the following: K200 = Kodak Elite Chrome ED 200 ASA, K1600 = Kodak EPH 1600 ASA.
Numbers 1–13 in the first column indicate the numbers of scenes in Figs. 2–4.
k (%) of the sky for which 45° ≤ α ≤ 135° (from the local zenith meridian), degree of linear polarization p (%), and noisiness n (%) of the α-pattern of the sky during the total solar eclipse on 29 March 2006 measured by full-sky imaging polarimetry in Turkey in the red (650 nm), green (550 nm), and blue (450 nm) parts of the spectrum and averaged for the entire sky (average ± standard deviation).
Table 4
Degree of Linear Polarization p (%) Measured by Full-Sky Imaging Polarimetry in the Red (R, 650 nm), Green (G, 550 nm) and Blue (B, 450 nm) Parts of the Spectrum at the Celestial Points with p Extrema in Scene 3 of the Preeclipse and in Scenes 4–11 of Totality During the Solar Eclipse on 29 March 2006 in Turkeya
Scene
π1
π2
π3
η1
η2
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
Preeclipse
3
41–43
27–29
27–29
27–29
20–22
20–22
—
—
—
4–6
2–4
2–4
6–8
6–8
6–8
Eclipse (totality)
4
34–36
34–36
20–22
20–22
27–29
20–22
20–22
—
—
6–8
4–6
2–4
4–6
8–10
4–6
5
20–22
16–18
8–10
10–12
8–10
4–6
10–12
8–10
4–6
2–3
1–2
0–1
0–1
0–1
0–1
6
20–22
20–22
8–10
—
—
—
12–14
12–14
6–8
2–3
1–2
0–1
1–2
0–1
0–1
7
27–29
27–29
16–18
16–18
20–22
12–14
16–18
—
—
4–6
4–6
2–4
4–6
4–6
2–4
8
27–29
27–29
16–18
20–22
20–22
12–14
—
—
—
4–6
4–6
2–4
4–6
4–6
2–4
9
27–29
27–29
14–16
16–18
20–22
12–14
—
—
—
4–6
4–6
2–4
4–6
4–6
2–4
10
20–22
20–22
12–14
16–18
20–22
10–12
—
—
—
4–6
4–6
2–4
4–6
4–6
2–4
11
20–22
20–22
10–12
16–18
16–18
10–12
—
—
—
4–6
4–6
2–4
4–6
4–6
2–4
π1, π2, π3, local maxima of p; η1, η2, unpolarized (neutral) points (p = 0%–1%, bold) or local minima of p.
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