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  Influence of the Interplanetary Convective Electric Field on the Distribution of Heavy Pickup Ions Around Mars

Johnson, B. C., Liemohn, M. W., Fränz, M., Ramstad, R., Wieser, G. S., & Nilsson, H. (2018). Influence of the Interplanetary Convective Electric Field on the Distribution of Heavy Pickup Ions Around Mars. Journal of Geophysical Research: Space Physics, 123(1), 473-484. doi:10.1002/2017JA024463.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-320B-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-320C-8
Genre: Journal Article

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 Creators:
Johnson, B. C., Author
Liemohn, M. W., Author
Fränz, Markus1, Author              
Ramstad, R., Author
Wieser, G. Stenberg, Author
Nilsson, H., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: This study obtains a statistical representation of 2–15 keV heavy ions outside of the Martian‐induced magnetosphere and depicts their organization by the solar wind convective electric field (ESW). The overlap in the lifetime of Mars Global Surveyor (MGS) and Mars Express (MEX) provides a period of nearly three years during which magnetometer data from MGS can be used to estimate the direction of ESW in order to better interpret MEX ion data. In this paper we use MGS estimates of ESW to express MEX ion measurements in Mars‐Sun‐Electric field (MSE) coordinates. A new methodological technique used in this study is the limitation of the analysis to a particular instrument mode for which the overlap between proton contamination and plume observations is rare. This allows for confident energetic heavy ion identification outside the induced magnetosphere boundary. On the dayside, we observe high count rates of 2–15 keV heavy ions more frequently in the +ESW hemisphere (+ZMSE) than in the −ESW hemisphere, but on the nightside the reverse asymmetry was found. The results are consistent with planetary origin ions being picked up by the solar wind convective electric field. Though a field of view hole hinders quantification of plume fluxes and velocity space, this new energetic heavy ion identification technique means that Mars Express should prove useful in expanding the time period available to assess general plume loss variation with drivers.

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Language(s): eng - English
 Dates: 2019-03-192018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/2017JA024463
 Degree: -

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Title: Journal of Geophysical Research: Space Physics
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 123 (1) Sequence Number: - Start / End Page: 473 - 484 Identifier: ISSN: 0148-0227
CoNE: https://pure.mpg.de/cone/journals/resource/991042728714264