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The fate of O+ ions...
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Schillings, AudreyLuleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Kiruna, Sweden
(author)
The fate of O+ ions observed in the plasma mantle: particle tracing modelling and cluster observations
- Article/chapterEnglish2020
Publisher, publication year, extent ...
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2020-06-03
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Copernicus Publications,2020
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electronicrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:ltu-76359
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https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76359URI
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https://doi.org/10.5194/angeo-38-645-2020DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172848URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Validerad;2020;Nivå 2;2020-07-01 (johcin);Full text license: CC BY
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Ion escape is of particular interest for studying the evolution of the atmosphere on geological timescales. Previously, using Cluster-CODIF data, we investigated the oxygen ion outflow from the plasma mantle for different solar wind conditions and geomagnetic activity. We found significant correlations between solar wind parameters, geomagnetic activity (Kp index), and the O+ outflow. From these studies, we suggested that O+ ions observed in the plasma mantle and cusp have enough energy and velocity to escape the magnetosphere and be lost into the solar wind or in the distant magnetotail. Thus, this study aims to investigate where the ions observed in the plasma mantle end up. In order to answer this question, we numerically calculate the trajectories of O+ ions using a tracing code to further test this assumption and determine the fate of the observed ions. Our code consists of a magnetic field model (Tsyganenko T96) and an ionospheric potential model (Weimer 2001) in which particles initiated in the plasma mantle region are launched and traced forward in time. We analysed 131 observations of plasma mantle events in Cluster data between 2001 and 2007, and for each event 200 O+ particles were launched with an initial thermal and parallel bulk velocity corresponding to the velocities observed by Cluster. After the tracing, we found that 98 % of the particles are lost into the solar wind or in the distant tail. Out of these 98 %, 20 % escape via the dayside magnetosphere.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Gunell, HerbertUmeå universitet,Institutionen för fysik,Department of Physics, Umeå University, Umeå, Sweden; Belgian Institute for Space Aeronomy, Brussels, Belgium(Swepub:umu)hegu0051
(author)
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Nilsson, HansLuleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Kiruna, Sweden(Swepub:ltu)hannil
(author)
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De Spiegeleer, AlexandreUmeå universitet,Institutionen för fysik,Department of Physics, Umeå University, Umeå, Sweden(Swepub:umu)alde0028
(author)
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Ebihara, YusukeResearch Institute for Sustainable Humanosphere, Kyoto University, 611-0011, Gokasho, Uji, Kyoto, Japan
(author)
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Westerberg, Lars GöranLuleå tekniska universitet,Strömningslära och experimentell mekanik(Swepub:ltu)lgwe
(author)
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Yamauchi, MasatoshiSwedish Institute of Space Physics, Kiruna, Sweden
(author)
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Slapak, RikardEISCAT Scientific Association, Kiruna, Sweden
(author)
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Luleå tekniska universitetRymdteknik
(creator_code:org_t)
Related titles
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In:Annales Geophysicae: Copernicus Publications38:3, s. 645-6560992-76891432-0576
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