| solar elevation |
Oriented
plates |
Single oriented columns |
Parry
oriented coumns |
|||
| 0 | C-1 | C-11 | C-23 | |||
| 10 | C-2 | C-12 | C-24 | |||
| 20 | C-3 | C-13 | C-25 | |||
| 30 | C-4 | C-14 | C-26 | |||
| 40 | C-5 | C-15 | C-27 | |||
| 50 | C-6 | C-16 | C-28 | |||
| 60 | C-7 | C-17 | C-29 | |||
| 70 | C-8 | C-18 | C-30 | |||
| 80 | C-19 | |||||
| C-9 | C-20 | C-31 | ||||
| C-10 | C-21 | C-32 | ||||
| C-22 |
| Differences
in conditions from Tape's simulations |
||
| Wavelength | Tape randomly
chooses wavelengths from "green" to "red". The HaloSim
simulations are for a single wavelength of 577 nm. Some of Tape's
arcs are therefore broader, particularly those where light is refracted
between faces with an interfacial angle of 90°. |
|
| c/a ratio | Tape uses an
unspecified distribution of c/a ratios about the mean. HaloSim uses a single
fixed c/a ratio. |
|
| Solar disk | HaloSim uses a point source. walter Tape uses an 0.5° diameter solar disk. | |
| Presentation | A very high resolution screen would be needed to reproduce Tape's printed simulations in two-level "black dots on white" simulations. These HaloSim simulations use an 8 level grey scale to best match Tape's printed pages. | |