摘要： The paper reports a clear dependence of a basic structure of two sublayers of the low‐latitude boundary layer (LLBL) on northward and southward interplanetary magnetic field (IMF) orientations. Regardless of different processes responsible for a formation and evolution of the entire LLBL, the outer part of the LLBL is significantly influenced by the sign of the IMF BZ component. Under northward IMF conditions this layer is present, whereas it is missing during a southward pointing IMF. This behavior can be understood in terms of a motion of reconnection spots due to the changes of the orientation of the magnetosheath magnetic field in the vicinity of the magnetopause. Our case and statistical studies demonstrate that the changes of the LLBL structure can be observed in the subsolar region as well as on flanks near the dawn‐dusk meridian. Moreover, the study emphasizes a role of magnetosheath magnetic field variations on the boundary layer formation. Key Points Southward versus northward IMF at the magnetopause Well‐developed outer and inner parts of the LLBL for a northward IMF Missing outer LLBL for a southward IMF orientation 其他題名： J. Geophys. Res. Space Physics 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2015-05 出處： Journal of geophysical research : Space physics (2013 - Present), 2015-05, Vol.120 (5), p.3475-3488 資源來源： Wiley Online Library eJournals 版權： 2015. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-9380 識別號： ISSN: 2169-9402 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/2014JA020308
