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Statistical Relationship Between Interplanetary Magnetic Field Conditions and the Helicity Sign of Flux Transfer Event Flux Ropes
Author(s) -
Kieokaew R.,
Lavraud B.,
Fargette N.,
Marchaudon A.,
Génot V.,
Jacquey C.,
Gershman D.,
Giles B.,
Torbert R.,
Burch J.
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl091257
Subject(s) - physics , magnetopause , flux (metallurgy) , magnetic helicity , interplanetary magnetic field , helicity , magnetic flux , interplanetary spaceflight , magnetic reconnection , solar wind , geophysics , rope , astrophysics , magnetohydrodynamics , coronal mass ejection , field line , magnetic field , materials science , structural engineering , particle physics , quantum mechanics , engineering , metallurgy
Flux transfer events (FTEs) are transient phenomena produced by magnetic reconnection at the dayside magnetopause typically under southward interplanetary magnetic field (IMF) conditions. They are usually thought of as magnetic flux ropes with helical structures forming through patchy, unsteady or multiple X‐line reconnection. While the IMF often has a non‐zero B Y component, its impacts on the FTE flux rope helicity remain unknown. We survey Magnetospheric Multiscale (MMS) observations of FTE flux ropes during years 2015–2017 and investigate the solar wind conditions prior to the events. By fitting a force‐free flux rope model, we select 84 events with good fits and obtain the helicity sign (i.e., handedness) of the flux ropes. We find that positive (negative) helicity flux ropes are mainly preceded by positive (negative) B Y component. This finding is compatible with flux ropes formed through a multiple X‐lines mechanism.