The most violent moment throughout the eruption of the Calbuco volcano in Chile. Credit: Francisco Negroni
Youve certainly gazed out of the window to admire a lightning storm in all its magnificence. Thunderstorms are certainly a sight to witness, however another, much less typical form of lightning is much more spectacular. As the name recommends, volcanic lightning is a lightning storm that occurs throughout a volcanic eruption. The science behind why it takes place is more complex than a regular lightning storm.
What Is Volcanic Lightning?
Volcanic lightning takes place in the plume of a volcanic eruption. Like all thunderstorms, volcanic lightning takes place when fixed electrical power constructs up in the atmosphere before being launched in the kind of a lightning bolt.
Volcanic lightning. Credit: Daniel Basualto
Ice Charging
Ice charging is the main system by which routine thunderstorms form, and it likewise plays a role in volcanic lightning, especially those where the plume increases high into the air. The water in the plume freezes into ice particles that clash with one another, knocking electrons from the crystals. These favorably charged ice ions continue to rise and gather together greater in the environment.
Frictional charging
Frictional charging, also understood as triboelectric charging, is likewise thought to be an important mechanism leading to volcanic lightning. In the exact same way that ice charging takes place due to ice particles clashing, rock fragments and ash collide and develop charged ions.
Fractoemission
Comparable to frictional charging is fractoemission, which is the separation of rock particles within the plume. When the rock breaks, it is possible for charged particles to form, forming a buildup of fixed charge. [3] This impact predominantly takes place at high energy, leading to the charge gathering together closer to the volcanos vent.
Radioactive charging
Natural radioisotopes within the rock might influence charge accumulation. Research studies have actually shown that ash particles have natural radioactivity above the typical level, and charged areas can form when they decay. [4] The degree radioactive charging has on volcanic lightning is unidentified, although it may be a considerable factor in some circumstances.
Plume height
While not a system in its own right, plume height can substantially affect whether lightning takes place. [5] When an eruption leads to a tall ash plume (greater than 7 km), there is a higher water vapor concentration. With more water present and colder ambient temperatures at this height, there is likely more ice charging and more electrical activity. For smaller sized plumes, the suggestion is that many of the electrical accumulation comes from fractoemission near the vent, decreasing the chances of a strike.
While the science behind volcanic lightning is not total, numerous aspects are understood to contribute. More research study ought to hopefully provide a better understanding of what is taking place throughout a strike. Whatever the mechanism, theres no doubt its a spectacular event!
Recommendations:
” Charge system of volcanic lightning exposed during the 2010 eruption of Eyjafjallajökull” by Pordur Arason, Alec J. Bennett and Laura E. Burgin, 14 December 2011, Journal of Geophysical Research: Solid Earth.DOI: 10.1029/ 2011JB008651.
” Electrification of volcanic plumes” by T. A. Mather and R. G. Harrison, 20 July 2006, Surveys in Geophysics.DOI: 10.1007/ s10712-006-9007-2.
” Volcanic plume electrification: Experimental investigation of a fracture-charging mechanism” by M. R. James, S. J. Lane and J. S. Gilbert, 10 July 2000, Journal of Geophysical Research: Solid Earth.DOI: 10.1029/ 2000JB900068.
” Electrical charging of volcanic ash” by Karen Aplin, Isobel Houghton, Keri Nicoll, Michael Humphries and Alex Tong, 2014, Proc. ESA Annual Meeting on Electrostatics 2014.PDF.
” Volcanic lightning: worldwide observations and restrictions on source mechanisms” by Stephen R. McNutt and Earle R. Williams, 5 August 2010, Bulletin of Volcanology.DOI: 10.1007/ s00445-010-0393-4.
As the name recommends, volcanic lightning is a lightning storm that takes place during a volcanic eruption. Volcanic lightning occurs in the plume of a volcanic eruption. Like all thunderstorms, volcanic lightning occurs when static electrical energy constructs up in the atmosphere prior to being launched in the type of a lightning bolt. Ice charging is the main system by which routine thunderstorms form, and it also plays a role in volcanic lightning, especially those where the plume rises high into the air. Frictional charging, also known as triboelectric charging, is also thought to be a vital mechanism leading to volcanic lightning.
