210 likes | 332 Views
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.
E N D
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 From: http://www.srrb.noaa.gov/highlights/redsky/page3.html
Whitening of the horizon: Rayleigh Scattering followed by Rayleigh Extinction From: http://www.m-why.com/archives/2005/03/
Rayleigh Scattering (light scattering by air as dipole radiation) 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. Dry air, 15 C, 101325 Pa, 0.045% CO2 by volume, vacuum in microns, (Birch, Metrologia, 1994, 31, 315). From http://www.kayelaby.npl.co.uk/general_physics/2_5/2_5_7.html. 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. Number concentration of air molecules.
Rayleigh Scattering (light scattering by air as dipole radiation)
Rayleigh Scattering (light scattering by air as dipole radiation)
Rayleigh Scattering (light scattering by air as dipole radiation) 42.3% of Total Energy, TOA
Rayleigh Scattering (light scattering by air as dipole radiation) 1.5% of Total Energy, TOA
Rayleigh Scattering (light scattering by air as dipole radiation) 6.3% of Total Energy, TOA
Rayleigh Scattering (light scattering by air as dipole radiation) 0.5% of Total Energy, TOA
Angular Dependence of Rayleigh Scattering (dipole) From: http://qels.com/theory/rayleighscattering/mass.cfm http://www.bo.astro.it/sait/spigolature/spigo402base.html Horizontal E-field Vertical E-field Dipoles don’t radiate in the direction they are undergoing linear ocsillation. From http://www.sparknotes.com/physics/optics/phenom/section3.rhtml
I0 N scatterers / volume q Isca(q) Rayleigh Scattering Intensity as a function of Scattering Angle. Random E-field incident, random scatterer orientation. From: http://www.jenkinsdisplays.com/led_bulbs/rayleigh_scattering.html
Dipole Radiation Pattern: (Petty, Ch12). Incident E-field vertical: Dipole charge oscillation vertical. = incident direction Irradiance Average for Random E-field: sum of the polarized patterns / 2. Incident E-field Horizontal
UV thoughts from http://uvb.nrel.colostate.edu/UVB/publications/uvb_primer.pdf
UV thoughts from http://uvb.nrel.colostate.edu/UVB/publications/uvb_primer.pdf
UV thoughts from http://uvb.nrel.colostate.edu/UVB/publications/uvb_primer.pdf
UV thoughts from http://uvb.nrel.colostate.edu/UVB/publications/uvb_primer.pdf Diffey action spectra: Damage spectra for sun-burn: 305 nm, rule of thumb, ‘worst’ UV wavelength.