Scientific article
Open access

First field evidence of the electrical multipolar nature of volcanic aggregates

Published inScience advances, vol. 8, no. 46, eabo7380
Publication date2022-11-16
First online date2022-11-18

The description of the formation of ash aggregates is crucial to our understanding of tephra dispersal and, therefore, to the forecasting of volcanic ash concentration in the atmosphere. Regardless of the importance of electrostatic processes, particle and aggregate charge is of complex determination both in the field and in the laboratory. We have measured the bulk charge carried by single aggregates at Sakurajima volcano (Japan) by inverting the sedimentation trajectory across two high-voltage copper plates filmed using a high-speed camera. Some aggregates were filmed during their breakage caused by the external electric field, which revealed the presence of inner highly charged multipoles with bulk charge up to one order of magnitude larger than the bulk aggregate. This electrical multipolar nature reveals the key role played by multipoles in aggregate formation and the shielding effect of aggregation on particle charge.

Citation (ISO format)
POLLASTRI, Stefano, ROSSI, Eduardo, BONADONNA, Costanza. First field evidence of the electrical multipolar nature of volcanic aggregates. In: Science advances, 2022, vol. 8, n° 46, p. eabo7380. doi: 10.1126/sciadv.abo7380
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Article (Published version)
ISSN of the journal2375-2548

Technical informations

Creation11/20/2022 12:24:00 PM
First validation11/20/2022 12:24:00 PM
Update time03/16/2023 9:03:04 AM
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