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A statistical study of magnetospheric ion composition along the geomagnetic field using the Cluster spacecraft for L values between 5.9 and 9.5

Sandhu, J.K., Yeoman, T.K., Fear, R.C. and Dandouras, I. (2016) A statistical study of magnetospheric ion composition along the geomagnetic field using the Cluster spacecraft for L values between 5.9 and 9.5 Journal of Geophysical Research: Space Physics, 121, (3), pp. 2194-2208. (doi:10.1002/2015JA022261).

Record type: Article


Using ion density data obtained by the CODIF (ion Composition and Distribution Function analyser) instrument on board the Cluster spacecraft, for the interval spanning 2001–2005, an empirical model describing the average ion mass distribution along closed geomagnetic field lines is determined. The empirical model describes the region spanning 5.9<L < 9.5, with dependences on L shell and magnetic local time included, and represents ions in the energy range of 0.025 to 40 keV/charge. The data reduction process involves the identification and rejection of CODIF data contaminated by penetrating energetic radiation belt particles, found to frequently occur for L < 5.9. Furthermore, a comparison of data with observations of the cold plasma population in the region provides evidence that the CODIF data set is representative of the full plasma population. The variations in average ion mass along the field lines were modeled using a power law form, which maximizes toward the magnetic equatorial plane, with observed power law index values ranging between approximately -2.0 and 0.0. The resulting model illustrates some key features of the average ion mass spatial distribution, such as an average ion mass enhancement at low L in the evening sector, indicating the transport of high-latitude heavy ion outflows to the closed inner magnetosphere.

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Accepted/In Press date: 18 February 2016
Published date: 18 March 2016
Organisations: Astronomy Group


Local EPrints ID: 394182
ISSN: 2169-9380
PURE UUID: f8af889d-826c-4aea-a616-8771bcccf1b9
ORCID for R.C. Fear: ORCID iD

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Date deposited: 12 May 2016 11:41
Last modified: 17 Jul 2017 19:02

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Author: J.K. Sandhu
Author: T.K. Yeoman
Author: R.C. Fear ORCID iD
Author: I. Dandouras

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