dipole in abstract fractal art
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Dipole in Abstract Fractal Art. From: http://www.raygirvan.co.uk/apoth/dipole.jpg. What would the sky look like if you saw in the Uvb (290-320 nm) or near IR (700-1500 nm) instead of the visible (400-700 nm)?. IR. VIS. UVb. Rayleigh Scattering: Photon Directions. - PowerPoint PPT PresentationTRANSCRIPT
Pat Arnott, UNR, ATMS 749
Dipole in Abstract Fractal Art
From: http://www.raygirvan.co.uk/apoth/dipole.jpg
Pat Arnott, UNR, ATMS 749
What would the sky look like if you saw in the Uvb (290-320 nm) or near IR (700-1500 nm) instead of the visible (400-700 nm)?
Pat Arnott, UNR, ATMS 749
Rayleigh Scattering: Photon Directions
From: http://www.srrb.noaa.gov/highlights/redsky/page3.html
Pat Arnott, UNR, ATMS 749
Whitening of the horizon: Rayleigh Scattering followed by Rayleigh Extinction
From: http://www.m-why.com/archives/2005/03/
Pat Arnott, UNR, ATMS 749
Rayleigh Scattering (light scattering by air as dipole radiation)
σs = 8π 3(mr2 −1)2
3λ 4N26+3δ6−7δ
(m r − 1) x 108 = 8,342.54 + 2,406,147
(130 −1 / λ2 ) +
15,998(38.9 −1 / λ2 )
Dry air, 15 C, 101325 Pa, 0.045% CO2 by volume, vacuum λ in microns, (Birch, Metrologia, 1994, 31, 315).
From http://www.kayelaby.npl.co.uk/general_physics/2_5/2_5_7.html.
From Liou pg 93. is the molecular anisotropy parameter as the polarizability is really a tensor. The refractive index relationship is in relation to the polarizability of air. = 0.035 for air.
mr(P,t) − 1 = (mr − 1) x P[1 + P(60.1 - 0.972t) x 10-10]96 095.43(1 + 0.003 661t)
Dry air, t in Celcius, P in Pascal, 0.045% CO2 by volume, Birch, Metrologia, 1994, 31, 315).
From http://www.kayelaby.npl.co.uk/general_physics/2_5/2_5_7.html.
N= PkbT
Number concentration of air molecules.
βsca1
Mm⎛⎝⎜
⎞⎠⎟
= σ scm2
molecule
⎛
⎝⎜⎞
⎠⎟Nmolecules
cm3
⎛⎝⎜
⎞⎠⎟
108 cm
Mm⎛⎝⎜
⎞⎠⎟
Pat Arnott, UNR, ATMS 749
Rayleigh Scattering (light scattering by air as dipole radiation)
42.3% of Total Energy, TOA
Pat Arnott, UNR, ATMS 749
Rayleigh Scattering (light scattering by air as dipole radiation)
1.5% of Total Energy, TOA
Pat Arnott, UNR, ATMS 749
Rayleigh Scattering (light scattering by air as dipole radiation)
6.3% of Total Energy, TOA
Pat Arnott, UNR, ATMS 749
Rayleigh Scattering (light scattering by air as dipole radiation)
0.5% of Total Energy, TOA
Pat Arnott, UNR, ATMS 749
Angular Dependence of Rayleigh Scattering (dipole)
Horizontal E-field Vertical E-fieldDipoles don’t radiate in the direction they are undergoing linear ocsillation.
From http://www.sparknotes.com/physics/optics/phenom/section3.rhtml
From:http://qels.com/theory/rayleighscattering/mass.cfmhttp://www.bo.astro.it/sait/spigolature/spigo402base.html
Pat Arnott, UNR, ATMS 749
Rayleigh Scattering Intensity as a function of Scattering Angle.
From: http://www.jenkinsdisplays.com/led_bulbs/rayleigh_scattering.html
I0
Isca()
N scatterers / volume
Isca()=I0NσsR2
P()4π
P()=34 1+cos2()⎛
⎝⎜⎜
⎞
⎠⎟⎟
Random E-field incident, random scatterer orientation.
Pat Arnott, UNR, ATMS 749
Dipole Radiation Pattern: (Petty, Ch12).
Incident E-field vertical: Dipole charge oscillation vertical.
Incident E-field Horizontal
Irradiance Average for Random E-field: sum of the polarized patterns / 2.
= incident direction
Pat Arnott, UNR, ATMS 749
UV thoughts from http://uvb.nrel.colostate.edu/UVB/publications/uvb_primer.pdf
Pat Arnott, UNR, ATMS 749
UV thoughts from http://uvb.nrel.colostate.edu/UVB/publications/uvb_primer.pdf
Pat Arnott, UNR, ATMS 749
UV thoughts from http://uvb.nrel.colostate.edu/UVB/publications/uvb_primer.pdf