| Central Wavelength (µm)* |
Channel No. | Also Known As . . . |
Half-Power Points** (µm) |
|---|---|---|---|
| 0.65 | 1 | VIS visible visual |
0.55-0.75 |
| 3.9 | 2 | IR2 shortwave shortwave window |
3.8-4.0 |
| 6.7 | 3 | IR3 water vapor WV |
6.5-7.0 |
| 10.7 | 4 | IR4 longwave IR window |
10.2-11.2 |
| 12.0 | 5 | IR5 split window dirty window IR12 |
11.5-12.5 |
|
*The symbol µm is an abbreviation for micrometer (one millionth of a
meter). It replaces the older unit micron symbolized by µ.
**The wavelengths where the response of the instrument is one half of the peak response. The instrument "sees" most of the radiation between these limits, but only a little radiation outside of them. |