K. MalakitM. A. ShayP. A. CassakD. RuffoloMahidol UniversityUniversity of DelawareWest Virginia UniversityCommission on Higher Education2018-10-192018-10-192013-09-23Physical Review Letters. Vol.111, No.13 (2013)10797114003190072-s2.0-84884681072https://repository.li.mahidol.ac.th/handle/123456789/32767We present a theory and numerical evidence for the existence of a previously unexplored in-plane electric field in collisionless asymmetric magnetic reconnection. This electric field, dubbed the "Larmor electric field," is associated with finite Larmor radius effects and is distinct from the known Hall electric field. Potentially, it could be an important indicator for the upcoming Magnetospheric Multiscale mission to locate reconnection sites as we expect it to appear on the magnetospheric side, pointing earthward, at the dayside magnetopause reconnection site. © 2013 American Physical Society.Mahidol UniversityPhysics and AstronomyArticleSCOPUS10.1103/PhysRevLett.111.135001