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The cruising altitude was 11.2 km with an outside temperature of - 54 deg C. The temperature was -24 degC at an altitude of 8 km, whereas it was - 5 degC at 4.9 km. This means, that the icing of under-cooled droplets had to occur in the region of the cruising altitude. In most images this Cumulonimbus cloud shows a clear convective structure in the upper parts, so that it is still a Cb calvus. However, the icing has already started in the front part of the right side. In CbIcing4.jpg this can be noticed at the winglet pointing downwards. |
When the first stripy, iced structure has been already formed
at a Cumulonimbus cloud, but a fully developed anvil does not exist
yet, the kind of cloud is called "capillatus".
CbIcing1.jpg to CbIcing7.jpg: S. Borrmann, flight Varig RG2375
from Fortaleza to Sao Paulo, Brazil, 2 March 2004 |
Camera Parameters Olympus E-1 SLR with 14-54 mm objective. Light exposure and sensitivity
(100 ASA) are chosen by program automation of the camera. The images
were taken in the sRGB range with a resolution of 2560 x 1920 Pixel
x 24 colours.
|
Lens aperture
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Time of exposure
|
Focal length
|
Time
|
|
CbIcing1.jpg |
8 |
1/640 |
54 |
3:45:47 p.m.
|
CbIcing2.jpg |
8 |
1/640 |
54 |
3:46:06 p.m. |
CbIcing4.jpg |
9 |
1/400 |
17 |
3:46:50 p.m. |
CbIcing5.jpg |
8 |
1/640 |
|
3:46:59 p.m. |
CbIcing7.jpg |
8 |
1/640 |
44 |
3:47:44 p.m. |