Circular Polarization by Single Scattering of Unpolarized Light from Loss-Less, Non-Spherical Particles

Bandermann, L. W.; Kemp, J. C.

doi:10.1093/mnras/162.4.367

Cited by 15 publications

(15 citation statements)

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“…The mechanisms that may produce circular polarization in comets were considered by Bandermann and Kemp (1973), Dolginov andMytrophanov (1975, 1976), Beskrovnaja et al (1987), Dolginov et al (1995). Summarizing these studies, one can conclude that circular polarization in comets may appear as a result of:…”

Section: Discussionmentioning

confidence: 99%

Circular polarization in comets: Observations of Comet C/1999 S4 (LINEAR) and tentative interpretation

Rosenbush

Kolokolova

Lazarian

et al. 2007

Icarus

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Comet C/1999 S4 (LINEAR) was exceptional in many respects. Its nucleus underwent multiple fragmentations culminating in the complete disruption around July 20, 2000. We present circular polarization measurements along the cuts through the coma and nucleus of the comet during three separate observing runs, in June 28-July 2, July 8-9, and July 21-22, 2000. The circular polarization was detected at a rather high level, up to 0.8%. The left-handed as well as right-handed polarization was observed over the coma with the left circularly polarized light systematically observed in the sunward part of the coma. During our observations the phase angle of the comet varied from 61 up to 122°, which allowed us to reveal variations of circular polarization with the phase angle. Correlation between the degree of circular polarization, visual magnitude, water production rate, and linear polarization of comet C/1999 S4 (LINEAR) during its final fragmentation in July 2000 was found.The mechanisms that may produce circular polarization in comets and specifically in comet C/1999 S4 (LINEAR) are discussed and some tentative interpretation is presented.

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Section: Discussionmentioning

confidence: 99%

Circular polarization in comets: Observations of Comet C/1999 S4 (LINEAR) and tentative interpretation

Rosenbush

Kolokolova

Lazarian

et al. 2007

Icarus

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“…The predominance of single scattering on small grains contradicts the formation of the circular polarization via repeated scatterings on grains whose size is comparable to the wavelength. Elliptically polarized light can also result from single scattering of unpolarized light on dielectric (with a real index of refraction), nonspherical grains [25]. This problem was considered as a way to explain the elliptic polarization of the zodiacal light (for which the highest degree of circular polarization is 0.86% [26]), where the multiple-scattering mechanism is also ruled out due to the low concentration of the grains.…”

Section: °5 885°5890°5895°mentioning

confidence: 99%

Polarimetry of the protoplanetary nebula AFGL 2688

et al. 2004

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Our spectroscopic (with resolution R = 75 000) and spectropolarimetric (R = 15 000) observations with the 6-m telescope of the Special Astrophysical Observatory have enabled us to distinguish photospheric and circumstellar features in the optical spectrum of the bipolar protoplanetary nebula AFGL 2688 for the first time. The linear polarization of the radiation was measured at 5000-6600Å. The emission in the lines of the sodium doublet and the Swan bands is formed in the envelope, and the mechanism exciting the transitions is resonance fluorescence. We conclude that the circumstellar envelope has a low density. Features of the structure of the nebula are discussed based on published high-angular-resolution photometric and polarimetric (HST NICMOS) data.

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“…The variable b is usually interpreted as ay,.the standard deviation of the elevation angle of the wind, and is rarely larger than 0.5. Results of calculations using (13) and b = 0.1 (shown in Figure 2) do not deviate significantly from the ratios predicted by (14) for all values of 0 k 0.1.…”

Section: Limiting Cases 1 Trajectories Above Source Pointmentioning

confidence: 72%

“…For certain values of 8 and b (those for which the value of the error functions in (13) are sufficiently near unity) the centerline concentration reduces to…”

Section: Limiting Cases 1 Trajectories Above Source Pointmentioning

confidence: 99%

Pacific Northwest Laboratory annual report for 1974 to the USAEC Division of Biomedical and Environmental Research. Part III. Atmospheric sciences

Simpson¹

1975

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PREFACEThe Annual R e p o r t f o r 1974 t o t h e U.S. Atomic E n e r g y C o m m i s s i o n ' s D i v i s i o n o f B i o m e d i c a l a n d E n v i r o n m e n t a l R e s e a r c h i s o r g a n i z e d b y m a j o r p r o g r a m c a t eg o r i e s a c c o r d i n g t o o u r s c h e d u l e -1 8 9 s u b m i s s i o n s . Each p a r t i s d i r e c t e d t oward a p a r t i c u l a r DBER R e s e a r c h a n d Development Program: P a r t 1 t o B i o m e d i c a l P r o g r a m s , P a r t s 2 a n d 3 t o E n v i r o n m e n t a l P r o g r a m s , a n d P a r t 4 t o P h y s i c a l and T e c h n o l o g i c a l P r o g r a m s .Each p a r t o f t h e Annual R e p o r t c o m p r i s e s p r o j e c t r e p o r t s a u t h o r e d by s c i e n t i s t s f r o m s e v e r a l r e s e a r c h d e p a r t m e n t s , r e f l e c t i n g t h e i n t e r d i s c i p l i n a r y n a t u r e o f t h e r e s e a r c h e f f o r t .The A n n u a l R e p o r t c o ns i s t s o f f o u r p a r t s : P a r t 1 B i o m e d i c a l S c i e n c e s P a r t 2 E c o l o g i c a l S c i e n c e s P a r t 3 A t m o s p h e r i c S c i e n c e s P a r t 4 P h y s i c a l and A n a l y t i c a l S c i e n c e s R e p o r t s p r e v i o u s l y i s s u e d a r e a s f o l l o w s :Annual R e p o r t f o r 1 9 5 1 1 9 5 2 1 9 5 3 1954 1 9 5 5 1 9 5 6 1957 1 9 5 8 1 9 5 9 1 9 6 0 1 9 6 1 1962 1 9 6 3 1 9 6 4 1 9 6 5 1 9 6 6 1967 1968 1 9 6 9 1970 1 9 7 1 1 9 7 2 1 9 7 3 1 9 7 4Program Manager: R . With expanding energy development and use, serious associated air pollutant levels are anticipated on local and regional scales, exceeding ambient air quality standards for periods of hours to days depending on their distribution and accumulation in the atmosphere. Consequently, further understanding of atmospheric transport processes in those time and space scales producing the pollutants is needed. This knowledge is the basis on which assessment methodologies must be developed and applied.The most urgent air pollution problems must be identified and continually reassessed to set priorities for more detailed investigations. To accomplish this, first of all pollutant distributions in the atmosphere are being measured in regions of potentially significant pollution; as well as in "background" regions, to evaluate hemispheric levels of both fossil fuel effluents and nuclear contaminants. The detailed airflow and dispersion behavior of pollutants distributed locally as well as over several states is being investigated to determine dependence on meteorological conditions and terrain features. Also under investigation are the significant alterations of physical and chemical characteristics of pollutants which occur during transport, varying as a function of atmospheric conditions. These modifications can strongly influence the effectiveness of pollutant removal from the atmosphere as well as the seriousness of the ultimate health or environmental impact. The removal of the pollutants by wet means in clouds and rain, and by dry means throu...

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Circular Polarization by Single Scattering of Unpolarized Light from Loss-Less, Non-Spherical Particles

Cited by 15 publications

References 0 publications

Circular polarization in comets: Observations of Comet C/1999 S4 (LINEAR) and tentative interpretation

Circular polarization in comets: Observations of Comet C/1999 S4 (LINEAR) and tentative interpretation

Polarimetry of the protoplanetary nebula AFGL 2688

Pacific Northwest Laboratory annual report for 1974 to the USAEC Division of Biomedical and Environmental Research. Part III. Atmospheric sciences

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