Three-dimensional evolution of flux rope CMEs and its relation to the local orientation of the heliospheric current sheet
arXiv:1312.0458 · doi:10.1007/s11207-013-0468-4
Abstract
Flux ropes (FRs) ejected from the Sun may change their geometrical orientation during their evolution which directly affects their geoeffectiveness. Therefore, it is crucial to understand how solar FRs evolve in the heliosphere to improve our space weather forecasting tools. We analyze 15 coronal mass ejections (CMEs), with clear FR signatures, observed during the decay of Solar Cycle 23 and rise of Solar Cycle 24. We estimate initial orientations of the FRs at the origin using extreme ultraviolet observations of post-eruption arcades and/or eruptive prominences. Then we reconstruct multiviewpoint coronagraph observations of the CMEs from ~2 to 30 Rs with a three-dimensional geometric representation of a FR to determine their geometrical parameters. Finally, we propagate the FRs from ~30 Rs to 1 AU through MHD-simulated background solar wind while using in-situ measurements at 1 AU of the associated magnetic cloud as a constraint for the propagation technique. These methodology allows us to estimate the FR orientation all the way from the Sun to 1 AU. We find that while the FRs deflection occurs predominantly below 30 Rs, a significant amount of deflection and rotation happens between 30 Rs and 1 AU. We compare the FR orientation to the local orientation of the heliospheric current sheet (HCS). We find that slow FRs tend to align with the streams of slow solar wind in the inner heliosphere. During the solar cycle minimum the slow solar wind channel as well as the HCS usually occupy the area in the vicinity of the solar equatorial plane, which in the past led researchers to the hypothesis that FRs align with the HCS. Our results show that exclusions from this rule are explained by interaction with the Parker-spiralled background magnetic field, which dominates over the magnetic interaction with the HCS in the inner heliosphere at least during solar minimum conditions.
19 pages, 7 figures, 1 table, accepted for publication in Solar Physics
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