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Dust sputtering within the inner heliosphere: a modelling study

Baumann, Carsten and Myrvang, Margaretha and Mann, Ingrid (2020) Dust sputtering within the inner heliosphere: a modelling study. Annales Geophysicae, 38, pp. 919-930. Copernicus Publications. doi: 10.5194/angeo-38-919-2020. ISSN 0992-7689.

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Official URL: https://angeo.copernicus.org/articles/38/919/2020/


The aim of this study is to investigate through modeling how sputtering by impacting solar wind ions influences the lifetime of dust particles in the inner heliosphere near the Sun. We consider three typical dust materials: silicate, Fe$_{0.4}$Mg$_{0.6}$O and carbon and describe their sputtering yields based on atomic yields given by the Stopping and Range of Ions in Matter (SRIM) package. The influence of the solar wind is characterized by plasma density, solar wind speed and solar wind composition and we assume for these parameters values that are typical for fast solar wind, slow solar wind and CME conditions to calculate the sputtering lifetimes of dust. To compare the sputtering lifetimes to typical sublimation lifetimes we use temperature estimates based on Mie calculations and material vapour pressure derived with the chemical equilibrium code MAGMA. We also compare the sputtering lifetimes to the Poynting-Robertson lifetime and to the collision lifetime. We present a set of sputtering rates and lifetimes that can be used for estimating dust destruction in the fast and slow solar wind and during CME conditions. Our results can be applied to solid particles of a few nm and larger. The sputtering lifetimes increase linearly with the size of particles. We show that sputtering rates increase during CME conditions, primarily because of the high number densities of heavy ions in the CME plasma. The shortest sputtering lifetimes we find are for silicate, followed by Fe$_{0.4}$Mg$_{0.6}$O and carbon. In a comparison between sputtering and sublimation lifetimes we concentrate on the nanodust population. The comparison shows that sublimation is the faster destruction process within 0.1 AU for Fe$_{0.4}$Mg$_{0.6}$O, within 0.05 AU for carbon dust and within 0.07 AU for silicate dust. The destruction by sputtering can play a role in the vicinity of the Sun. We discuss our findings in the context of recent F-corona intensity measurements onboard Parker Solar Probe.

Item URL in elib:https://elib.dlr.de/135705/
Document Type:Article
Title:Dust sputtering within the inner heliosphere: a modelling study
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Baumann, CarstenUNSPECIFIEDhttps://orcid.org/0000-0001-7104-5992UNSPECIFIED
Mann, IngridUNSPECIFIEDhttps://orcid.org/0000-0002-2805-3265UNSPECIFIED
Date:3 August 2020
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 919-930
Publisher:Copernicus Publications
Keywords:dust, sputtering, Solar Orbiter, Parker Solar Probe
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Space Weather Impact
Deposited By: Baumann, Carsten
Deposited On:01 Oct 2020 11:20
Last Modified:27 Oct 2023 15:16

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