Interactions between Coronal Mass Ejections Viewed in Coordinated Imaging and In Situ Observations
| Autor: | Stuart D. Bale, Dusan Odstrcil, J. C. Martínez-Oliveros, Ying Liu, Christian Möstl, Manuela Temmer, Robert P. Lin, Richard A. Harrison, Janet G. Luhmann, David F. Webb |
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| Rok vydání: | 2012 |
| Předmět: |
In situ
Physics Shock wave Shock propagation 010504 meteorology & atmospheric sciences Front (oceanography) FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Shock (mechanics) Particle acceleration Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science 0103 physical sciences Coronal mass ejection Ejecta 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.1201.2968 |
| Popis: | The successive coronal mass ejections (CMEs) from 2010 July 30 - August 1 present us the first opportunity to study CME-CME interactions with unprecedented heliospheric imaging and in situ observations from multiple vantage points. We describe two cases of CME interactions: merging of two CMEs launched close in time and overtaking of a preceding CME by a shock wave. The first two CMEs on August 1 interact close to the Sun and form a merged front, which then overtakes the July 30 CME near 1 AU, as revealed by wide-angle imaging observations. Connections between imaging observations and in situ signatures at 1 AU suggest that the merged front is a shock wave, followed by two ejecta observed at Wind which seem to have already merged. In situ measurements show that the CME from July 30 is being overtaken by the shock at 1 AU and is significantly compressed, accelerated and heated. The interaction between the preceding ejecta and shock also results in variations in the shock strength and structure on a global scale, as shown by widely separated in situ measurements from Wind and STEREO B. These results indicate important implications of CME-CME interactions for shock propagation, particle acceleration and space weather forecasting. Comment: Accepted for publication in ApJ Letters |
| Databáze: | OpenAIRE |
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