Redefining the boundaries of interplanetary coronal mass ejections from observations at the ecliptic plane

Abstract

On 2015 January 6-7, an interplanetary coronal mass ejection (ICME) was observed at L1. This event, which can be associated with a weak and slow coronal mass ejection, allows us to discuss on the differences between the boundaries of the magnetic cloud and the compositional boundaries. A fast stream from a solar coronal hole surrounding this ICME offers a unique opportunity to check the boundaries' process definition and to explain differences between them. Using Wind and ACE data, we perform a complementary analysis involving compositional, magnetic, and kinematic observations providing relevant information regarding the evolution of the ICME as travelling away from the Sun. We propose erosion, at least at the front boundary of the ICME, as the main reason for the difference between the boundaries, and compositional signatures as the most precise diagnostic tool for the boundaries of ICMEs.

9 pages and 7 figures in the original format

References in corpus (7)

• A Model for the Sources of the Slow Solar Wind
• Automated LASCO CME catalog for solar cycle 23: are CMEs scale invariant?
• Progressive transformation of a flux rope to an ICME
• The SWAP EUV Imaging Telescope Part I: Instrument Overview and Pre-Flight Testing
• The SWAP EUV Imaging Telescope. Part II: In-flight Performance and Calibration
• Automatic Detection and Tracking of CMEs II: Multiscale Filtering of Coronagraph Data
• Magnetic Systems Triggering the M6.6-class Solar Flare in NOAA Active Region 11158

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• The distribution function of the average iron charge state at 1 AU: from a bimodal wind to ICME identification