The below videos were obtain on June 21, 2018 by observing the
green laser sheet in Pi Cloud Chamber at Michigan Technological
University. The Pi Cloud Chamber contained super-cooled droplets
at -5.8 C, which had ice nuclei (AgI) injected. In the videos,
blight green areas have many droplets, dark areas lack droplets,
and blight sparkles are ice particles. A detailed example is
presented on the 3:14 Video slide and additional information about
the experiment is available in the 2019
Weather Modification Association (WMA) presentation.
For easy comparison, the Side By Side video shows two different
times periods. The left side is without ice nuclei in the cloud
chamber and the right side is with ice nuclei (from cloud seeding
flares) in the cloud chamber. The blight specks in the video
are an indication of ice, which is confirmed using instruments.
3:14 pm Video (mp4 - 1.7 Gbytes,
ogv - 0.5
Gbytes) [Side
By Side 15 seconds (00:00 - 00:15 and 05:22-05:37)]
- 0:23 - Injection starts.
- 1:14 - Start to see some ice.
- 2:16 - More turbulent eddies start forming.
- 2:33 - Ice is becoming more prevalent.
- 3:52 - In the upper right corner there is a large
dark area that may indicate ice and vapor mixed out.
- 5:22 - Ice continue to increase.
- 7:00 - Water drops depleting as more dark spots can
be seen.
- 8:37 - Very little super cooled drops left.
- 9:06 - Most of the particles are now ice.
- 9:33 - Water drops increasing.
- 10:15 - Chamber mainly ice particles.
3:49 pm Video (mp4 - 4.0 Gbytes)
- 0:00 - Chamber already turbulent.
- 0:41 - Start seeing some sparkles indicating some ice
formation.
- 2:05 - Starting to see more ice particles.
- 3:47 - Numerous ice particle are now present.
- 5:08 - Seeing ice particle fall out with dark spots
becoming more numerous.
- 10:08 - Ice continue to fall out.
- 10:28 - Injection stop.
- 14:55 - Ice slightly increasing.
- 16:20 - Large dark spot appears in middle right.
- 16:53 - Seems like ice is falling out again.
- 18:26 - Large increase in ice.
- 23:43 - Mostly water droplets in the chamber.
4:24 pm Video (mp4 - 3.3 Gbytes)
- 0:54 - Seeing some ice.
- 2:28 - Ice increasing.
- 3:41 - Ice concentration seems to be staying fairly
constant.
- 4:05 - Ice drastically increased.
- 6:52 - Ice contraction staying high.
- 8:09 - Ice concentration have decreased a bit.
- 10:46 - Suddenly turbulent.
- 14:03 - Little ice left in the chamber.
- 16:11 - Chamber became very foggy.
- 16:26 - Beginning to see an increase in ice again.
4:49 pm Video (mp4 - 4.1 Gbytes)