Characteristics of Kinematics of a Coronal Mass Ejection During the 2010 August 1 Cme–cme Interaction Event
Year: 2012
Type: article
Abstract: We study the interaction of two successive coronal mass ejections (CMEs) during the 2010 August 1 events using STEREO /SECCHI COR and heliospheric imager (HI) data. We obtain the direction of motion for both CMEs by applying several independent reconstruction methods and find that the CMEs head in similar directions. This provides evidence that a full interaction takes place between the two CMEs that can be observed in the HI1 field of view. The full de-projected kinematics of the faster CME from Sun to Earth is derived by combining remote observations with in situ measurements of the CME at 1 AU. The speed profile of the faster CME (CME2; ∼1200 km s −1 ) shows a strong deceleration over the distance range at which it reaches the slower, preceding CME (CME1; ∼700 km s −1 ). By applying a drag-based model we are able to reproduce the kinematical profile of CME2, suggesting that CME1 represents a magnetohydrodynamic obstacle for CME2 and that, after the interaction, the merged entity propagates as a single structure in an ambient flow of speed and density typical for quiet solar wind conditions. Observational facts show that magnetic forces may contribute to the enhanced deceleration of CME2. We speculate that the increase in magnetic tension and pressure, when CME2 bends and compresses the magnetic field lines of CME1, increases the efficiency of drag.
Source: The Astrophysical Journal
Authors: Manuela Temmer, Bojan Vršnak, Tanja Rollett, Bianca Bein, Curt A. de Koning, Ying Liu, Eckhard Bosman, Jackie A. Davies, Christian Möstl, Tomislav Žic, Astrid M. Veronig, Volker Bothmer, Richard Harrison, Nariaki Nitta, Mario Bisi, Olga Flor, Jonathan Eastwood, Dusan Odstrcil, Robert Forsyth
Institutions: University of Graz, University of Zagreb, National Oceanic and Atmospheric Administration, NOAA Space Weather Prediction Center, Chinese Academy of Sciences, National Space Science Center, State Key Laboratory of Space Weather, Space Sciences Laboratory, University of California, Berkeley, Austrian Academy of Sciences, Space Research Institute, University of Göttingen, Rutherford Appleton Laboratory, Lockheed Martin (United States), Aberystwyth University, University of California San Diego, Imperial College London, Goddard Space Flight Center, George Mason University, National Aeronautics and Space Administration
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: G1734324871, Magnetic Reconnection as a Universal Plasma Process: Investigating Onset, Energy Release and Particle Acceleration, G3207356259, Coronal mass ejections - dynamic evolution in the heliosphere, G393177772, SOlar-TERrestrial Investigations and Archives, Imperial College Space Physics Rolling Grant, G5702163051, CURT DE KONING/THE REGENTS OF THE UNIVERSITY OF COLORADOSINGLE- AND MULTI-VIEW 3D LOCALIZATION AND ANALYSIS OF CORONAL MASS EJECTIONSSINGLE- AND M, COronal Mass Ejections and Solar Energetic Particles: forecasting the space weather impact
OpenAlex ID: W2032602425