THE DEFLECTION OF THE TWO INTERACTING CORONAL MASS EJECTIONS OF 2010 MAY 23–24 AS REVEALED BY COMBINED IN SITU MEASUREMENTS AND HELIOSPHERIC IMAGING
By N. Lugaz, C. Farrugia, J. Davies, Christian Möstl, Christopher Davis, Ilia I. Roussev, M. Temmer. 2012
138 citations recorded by the source corpus.
In 2010 May 23–24, Solar Dynamics Observatory (SDO) observed the launch of two successive coronal mass ejections (CMEs), which were subsequently tracked by the SECCHI suite on board STEREO. Using the COR2 coronagraphs and the heliospheric imagers (HIs), the initial direction of both CMEs is determined to be slightly west of the Sun–Earth line. We derive the CME kinematics, including the evolution of the CME expansion until 0.4 AU. We find that, during the interaction, the second CME decelerates from a speed above 500 km s−1 to 380 km s−1, the speed of the leading edge of the first CME. STEREO observes a complex structure composed of two different bright tracks in HI2-A but only one bright track in HI2-B. In situ measurements from Wind show an “isolated” interplanetary CME, with the geometry of a flux rope preceded by a shock. Measurements in the sheath are consistent with draping around the transient. By combining remote-sensing and in situ measurements, we determine that this event shows a clear instance of deflection of two CMEs after their collision, and we estimate the deflection of the first CME to be about 10° toward the Sun–Earth line. The arrival time, arrival speed, and radius at Earth of the first CME are best predicted from remote-sensing observations taken before the collision of the CMEs. Due to the over-expansion of the CME after the collision, there are few, if any, signs of interaction in in situ measurements. This study illustrates that complex interactions during the Sun-to-Earth propagation may not be revealed by in situ measurements alone.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/015419837bc39dd1a8e788d303d70af39ebf22f5
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
Citations in the corpus
- The Interaction of Successive Coronal Mass Ejections: A Review (2016, background): “In addition to changes in velocity, CME-CME interaction may result in the deflection of one CME by another (Xiong, Zheng, and Wang, 2009; Lugaz et al., 2012; Shen et al., 2012a).”
- The Physical Processes of CME/ICME Evolution (2017, background): “In one case study, similar results were found: remote observations indicated compression but, a day after the interaction ended, when the CME impacted Earth, the in situ measurements indicated a typical CME size (Lugaz et al. 2012).”