On Friday, April 13, 2018, the Danish ASIM experiment was installed on the outside of the European Columbus module of the ISS International Space Station. The instrument gives us insight into the luminous phenomena that take place over violent thunderstorms. The Belgian B.USOC is responsible for the infrastructure and operations of ASIM.
Formic acid contributes significantly to acid rain in remote environments. Direct sources of formic acid include human activities, biomass burning and plant leaves. Aside from these direct sources, sunlight-induced oxidation of non-methane hydrocarbons (largely of biogenic origin) is probably the largest source.