Evolution of a Long-Duration Coronal Mass Ejection and its Sheath Region Between Mercury and Earth on 2013 July 9-14

Abstract

Using in situ measurements and remote-sensing observations, we study a coronal mass ejection (CME) that left the Sun on 9 July 2013 and impacted both Mercury and Earth while the planets were in radial alignment (within $3^{\circ }$). The CME had an initial speed as measured by coronagraphs of 580 $\pm$ 20 km s${}^{-1}$, an inferred speed at Mercury of 580 $\pm$ 30 km s${}^{-1}$ and a measured maximum speed at Earth of 530 km s${}^{-1}$, indicating that it did not decelerate substantially in the inner heliosphere. The magnetic field measurements made by MESSENGER and {\it Wind} reveal a very similar magnetic ejecta at both planets. We consider the CME expansion as measured by the ejecta duration and the decrease of the magnetic field strength between Mercury and Earth and the velocity profile measured {\it in situ} by {\it Wind}. The long-duration magnetic ejecta (20 and 42 hours at Mercury and Earth, respectively) is found to be associated with a relatively slowly expanding ejecta at 1 AU, revealing that the large size of the ejecta is due to the CME itself or its expansion in the corona or innermost heliosphere, and not due to a rapid expansion between Mercury at 0.45 AU and Earth at 1 AU. We also find evidence that the CME sheath is composed of compressed material accumulated before the shock formed, as well as more recently shocked material.

arXiv commentAccepted to JGRA

References in corpus (20)

• The Interaction of Successive Coronal Mass Ejections: A Review
• The Deflection of the Two Interacting Coronal Mass Ejections of 2010 May 23-24 as Revealed by Combined In situ Measurements and Heliospheric Imaging
• Deriving the radial distances of wide coronal mass ejections from elongation measurements in the heliosphere - Application to CME-CME interaction
• Progressive transformation of a flux rope to an ICME
• Properties and Geoeffectiveness of Magnetic Clouds during Solar Cycles 23 and 24
• Global and local expansion of magnetic clouds in the inner heliosphere
• Self-Similarity of ICME Flux Ropes: Observations by Radially Aligned Spacecraft in the Inner Heliosphere
• Generic magnetic field intensity profiles of interplanetary coronal mass ejections at Mercury, Venus and Earth from superposed epoch analyses
• Forward modeling of coronal mass ejection flux ropes in the inner heliosphere with 3DCORE
• Understanding the twist distribution inside magnetic flux ropes by anatomizing an interplanetary magnetic cloud
• A New Class of Complex Ejecta Resulting from the Interaction of two CMEs and its Expected Geoeffectiveness
• Planar magnetic structures in coronal mass ejection-driven sheath regions
• On Sun-to-Earth Propagation of Coronal Mass Ejections: 2. Slow Events and Comparison with Others
• Heliospheric Evolution of Magnetic Clouds
• An Analytical Diffusion-Expansion Model for Forbush Decreases Caused by Flux Ropes
• Importance of CME Radial Expansion on the Ability of Slow CMEs to Drive Shocks
• Correlation of ICME Magnetic Fields at Radially Aligned Spacecraft
• Effect of Solar Wind Drag on the Determination of the Properties of Coronal Mass Ejections from Heliospheric Images
• A study of the Heliocentric dependence of Shock Standoff Distance and Geometry using 2.5D MHD Simulations of CME-driven shocks
• Evolution of CME Properties in the Inner Heliosphere: Prediction for Solar Orbiter and Parker Solar Probe

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• The effect of stream interaction regions on ICME structures observed in longitudinal conjunction
• On the Radial and Longitudinal Variation of a Magnetic Cloud: ACE, Wind, ARTEMIS and Juno Observations
• Causes and Consequences of Magnetic Complexity Changes within Interplanetary Coronal Mass Ejections: a Statistical Study
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• Properties of the Sheath Regions of Coronal Mass Ejections with or without Shocks from STEREO in situ Observations near 1 AU
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• Evolution of interplanetary coronal mass ejection complexity: a numerical study through a swarm of simulated spacecraft
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• Categorization of Coronal Mass Ejection Driven Sheath Regions: Characteristics of STEREO Events
• On the utility of flux rope models for CME magnetic structure below 30$R_{\odot }$
• Evolution of the Radial Size and Expansion of Coronal Mass Ejections Investigated by Combining Remote and In-Situ Observations
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