Electrical properties of volcanic ash samples from Eyafjallajökull and Grimsvötn
Volcanic ash is known to charge electrically, producing some of the most spectacular displays of lightning in nature. Here we investigate the electrical characteristics of ash from two different Icelandic volcanoes - Eyjafjallajökull in 2010 and Grímsvötn in 2011. Laboratory tests investigated the c...
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ftubristolcris:oai:research-information.bris.ac.uk:publications/11da0d46-79f9-47ac-970d-db2ed094b4a5 2023-05-15T16:09:23+02:00 Electrical properties of volcanic ash samples from Eyafjallajökull and Grimsvötn Piper, IM Aplin, KL Nicoll, KA 2012-04 http://hdl.handle.net/1983/11da0d46-79f9-47ac-970d-db2ed094b4a5 https://research-information.bris.ac.uk/en/publications/11da0d46-79f9-47ac-970d-db2ed094b4a5 eng eng info:eu-repo/semantics/restrictedAccess Piper , IM , Aplin , KL & Nicoll , KA 2012 , Electrical properties of volcanic ash samples from Eyafjallajökull and Grimsvötn . in Annual Aerosol Society Conference 2012, University of Bristol . pp. 11 - 13 . contributionToPeriodical 2012 ftubristolcris 2021-08-02T10:10:24Z Volcanic ash is known to charge electrically, producing some of the most spectacular displays of lightning in nature. Here we investigate the electrical characteristics of ash from two different Icelandic volcanoes - Eyjafjallajökull in 2010 and Grímsvötn in 2011. Laboratory tests investigated the charge transferred to a conducting plate due to fall of volcanic ash through an insulating cylinder. Ash from the Eyjafjallajökull eruption was found to charge slightly positively, whilst Grímsvötn ash was substantially negatively charged. Measurement of the volumetric ratio of particle diameters showed the Eyjafjallajökull ash to have a bimodal distribution, and the Grímsvötn ash a monomodal distribution. Previous experiments with single-material particle systems show that smaller particles charge negatively and larger ones positively. Since charge is carried by individual particles, the charging is likely to be dominated by the number size distribution, therefore the large negative charge of the Grímsvötn ash is likely to be related to a large number of small particles within the number size distribution of the ash. Volcanic ash is known to charge electrically, producing some of the most spectacular displays of lightning in nature. Here we investigate the electrical characteristics of ash from two different Icelandic volcanoes - Eyjafjallajökull in 2010 and Grímsvötn in 2011. Laboratory tests investigated the charge transferred to a conducting plate due to fall of volcanic ash through an insulating cylinder. Ash from the Eyjafjallajökull eruption was found to charge slightly positively, whilst Grímsvötn ash was substantially negatively charged. Measurement of the volumetric ratio of particle diameters showed the Eyjafjallajökull ash to have a bimodal distribution, and the Grímsvötn ash a monomodal distribution. Previous experiments with single-material particle systems show that smaller particles charge negatively and larger ones positively. Since charge is carried by individual particles, the charging is likely to be dominated by the number size distribution, therefore the large negative charge of the Grímsvötn ash is likely to be related to a large number of small particles within the number size distribution of the ash. Other Non-Article Part of Journal/Newspaper Eyjafjallajökull University of Bristol: Bristol Research |
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University of Bristol: Bristol Research |
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English |
description |
Volcanic ash is known to charge electrically, producing some of the most spectacular displays of lightning in nature. Here we investigate the electrical characteristics of ash from two different Icelandic volcanoes - Eyjafjallajökull in 2010 and Grímsvötn in 2011. Laboratory tests investigated the charge transferred to a conducting plate due to fall of volcanic ash through an insulating cylinder. Ash from the Eyjafjallajökull eruption was found to charge slightly positively, whilst Grímsvötn ash was substantially negatively charged. Measurement of the volumetric ratio of particle diameters showed the Eyjafjallajökull ash to have a bimodal distribution, and the Grímsvötn ash a monomodal distribution. Previous experiments with single-material particle systems show that smaller particles charge negatively and larger ones positively. Since charge is carried by individual particles, the charging is likely to be dominated by the number size distribution, therefore the large negative charge of the Grímsvötn ash is likely to be related to a large number of small particles within the number size distribution of the ash. Volcanic ash is known to charge electrically, producing some of the most spectacular displays of lightning in nature. Here we investigate the electrical characteristics of ash from two different Icelandic volcanoes - Eyjafjallajökull in 2010 and Grímsvötn in 2011. Laboratory tests investigated the charge transferred to a conducting plate due to fall of volcanic ash through an insulating cylinder. Ash from the Eyjafjallajökull eruption was found to charge slightly positively, whilst Grímsvötn ash was substantially negatively charged. Measurement of the volumetric ratio of particle diameters showed the Eyjafjallajökull ash to have a bimodal distribution, and the Grímsvötn ash a monomodal distribution. Previous experiments with single-material particle systems show that smaller particles charge negatively and larger ones positively. Since charge is carried by individual particles, the charging is likely to be dominated by the number size distribution, therefore the large negative charge of the Grímsvötn ash is likely to be related to a large number of small particles within the number size distribution of the ash. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Piper, IM Aplin, KL Nicoll, KA |
spellingShingle |
Piper, IM Aplin, KL Nicoll, KA Electrical properties of volcanic ash samples from Eyafjallajökull and Grimsvötn |
author_facet |
Piper, IM Aplin, KL Nicoll, KA |
author_sort |
Piper, IM |
title |
Electrical properties of volcanic ash samples from Eyafjallajökull and Grimsvötn |
title_short |
Electrical properties of volcanic ash samples from Eyafjallajökull and Grimsvötn |
title_full |
Electrical properties of volcanic ash samples from Eyafjallajökull and Grimsvötn |
title_fullStr |
Electrical properties of volcanic ash samples from Eyafjallajökull and Grimsvötn |
title_full_unstemmed |
Electrical properties of volcanic ash samples from Eyafjallajökull and Grimsvötn |
title_sort |
electrical properties of volcanic ash samples from eyafjallajökull and grimsvötn |
publishDate |
2012 |
url |
http://hdl.handle.net/1983/11da0d46-79f9-47ac-970d-db2ed094b4a5 https://research-information.bris.ac.uk/en/publications/11da0d46-79f9-47ac-970d-db2ed094b4a5 |
genre |
Eyjafjallajökull |
genre_facet |
Eyjafjallajökull |
op_source |
Piper , IM , Aplin , KL & Nicoll , KA 2012 , Electrical properties of volcanic ash samples from Eyafjallajökull and Grimsvötn . in Annual Aerosol Society Conference 2012, University of Bristol . pp. 11 - 13 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766405278789533696 |