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Volume 34, issue 5
Ann. Geophys., 34, 511–528, 2016
https://doi.org/10.5194/angeo-34-511-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 34, 511–528, 2016
https://doi.org/10.5194/angeo-34-511-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 10 May 2016

Regular paper | 10 May 2016

The dawn–dusk asymmetry of ion density in the dayside magnetosheath and its annual variability measured by THEMIS

Andrew P. Dimmock et al.
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Cited articles  
Alfthan, S., Pokhotelov, D., Kempf, Y., Hoilijoki, S., Honkonen, I., Sandroos, A., and Palmroth, M.: Vlasiator First global hybrid Vlasov simulations of Earths foreshock and magnetosheath, J. Atmos. Sol. Terr.-Phy., 120, 24–35, https://doi.org/10.1016/j.jastp.2014.08.012, 2014.
Angelopoulos, V.: The THEMIS Mission, Space Sci. Rev., 141, 5–34, https://doi.org/10.1007/s11214-008-9336-1, 2008.
Archer, M. O. and Horbury, T. S.: Magnetosheath dynamic pressure enhancements: occurrence and typical properties, Ann. Geophys., 31, 319–331, https://doi.org/10.5194/angeo-31-319-2013, 2013.
Bieber, J. W. and Stone, S. C.: Energetic electron bursts in the magnetopause electron layer and in interplanetary space, in: Magnetospheric Boundary Layers, edited by: Battrick, B., Mort, J., Haerendel, G., and Ortner, J., ESA Sp. Publ., 148, 131–135, 1979.
Chaston, C., Bonnell, J., McFadden, J. P., Carlson, C. W., Cully, C., Le Contel, O., Roux, A., Auster, H. U., Glassmeier, K. H., Angelopoulos, V., and Russell, C. T.: Turbulent heating and cross-field transport near the magnetopause from THEMIS, Geophys. Res. Lett., 35, L17S08, https://doi.org/10.1029/2008GL033601, 2008.
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Ion densities measured on the dawn-side magnetosheath flank were higher than the dusk-flank. The asymmetry was measured close to the magnetopause, but it became more ambiguous in the central magnetosheath. We show that the asymmetry was at its maximum at the 2009 solar minimum (~ 20 %), but then decreased in the rising stage of the next solar cycle (< 5 %). These results could impact plasma transport processes which are dependent on local magnetopause conditions such as Kelvin Helmholtz Instability.
Ion densities measured on the dawn-side magnetosheath flank were higher than the dusk-flank. The...
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