Dawn-dusk asymmetries in the Earth%26apos;s magnetosheath

作者：Walsh B M^*; Sibeck D G; Wang Y; Fairfield D H

来源：Journal of Geophysical Research, 2012, 117: A12211.

DOI：10.1029/2012JA018240

Statistical observations by the THEMIS spacecraft show a dawn-dusk asymmetry in plasma parameters within the Earth%26apos;s magnetosheath. Proton density and temperature are greater on the dawnside while the magnetic field strength and bulk flow are greater on the duskside. The asymmetry has been measured just outside the magnetopause in the dayside magnetosheath through 1114 boundary crossings from 2008 through 2010. These results are compared with modeling from the BATS-R-US global MHD code and are consistent with the expected asymmetries that would result from the interactions of the Parker spiral interplanetary magnetic field with the Earth%26apos;s bow shock. Solar cycle variations are analyzed for the current and past studies to predict the influence of upstream conditions during different time periods. Citation: Walsh, B. M., D. G. Sibeck, Y. Wang, and D. H. Fairfield (2012), Dawn-dusk asymmetries in the Earth%26apos;s magnetosheath, J. Geophys. Res., 117, A12211, doi:10.1029/2012JA018240.

• 出版日期2012-12-8