  We demonstrated for the first time the condensation and precipitation (or
snowfall) induced by a corona discharge inside a cloud chamber. Ionic wind was
found to have played a more significant role than ions as extra Cloud
Condensation Nuclei (CCN). 2.25 g of net snow enhancement was measured after
applying a 30 kV corona discharge for 25 min. In comparison with another newly
emerging femtosecond laser filamentation method, the snow precipitation induced
by the corona discharge has about 4 orders of magnitude higher wall-plug
efficiency under similar conditions.
