CME-HSS Interaction and Characteristics Tracked from Sun to Earth

Stephan G Heinemann; Manuela Temmer; Charles J Farrugia; Karin Dissauer; Christina Kay; Thomas Wiegelmann; Mateja Dumbović; Astrid M Veronig; Tatiana Podladchikova; Stefan J Hofmeister; Noé Lugaz; Fernando Carcaboso

doi:10.1007/s11207-019-1515-6

CME-HSS Interaction and Characteristics Tracked from Sun to Earth

Sol Phys. 2019;294(9):121. doi: 10.1007/s11207-019-1515-6. Epub 2019 Sep 13.

Authors

Affiliations

¹ 1Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria.
² 2Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Morse Hall, 8 College Road, Durham, NH 03824-3525 USA.
³ 4Dept. of Physics, The Catholic University of America, Washington, DC USA.
⁴ 3Solar Physics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD USA.
⁵ 5Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany.
⁶ 6Kanzelhöhe Observatory for Solar and Environmental Research, University of Graz, 9521 Treffen, Austria.
⁷ 7Skolkovo Institute of Science and Technology Skolkovo Innovation Center, Building 3, Moscow, 143026 Russia.
⁸ 8Dpto. de Física y Matemáticas, Universidad de Alcalá, 28805 Alcalá de Henares, Madrid, Spain.

Abstract

In a thorough study, we investigate the origin of a remarkable plasma and magnetic field configuration observed in situ on June 22, 2011, near L1, which appears to be a magnetic ejecta (ME) and a shock signature engulfed by a solar wind high-speed stream (HSS). We identify the signatures as an Earth-directed coronal mass ejection (CME), associated with a C7.7 flare on June 21, 2011, and its interaction with a HSS, which emanates from a coronal hole (CH) close to the launch site of the CME. The results indicate that the major interaction between the CME and the HSS starts at a height of $1.3 R_{⊙}$ up to $3 R_{⊙}$ . Over that distance range, the CME undergoes a strong north-eastward deflection of at least $30^{\circ}$ due to the open magnetic field configuration of the CH. We perform a comprehensive analysis for the CME-HSS event using multi-viewpoint data (from the Solar TErrestrial RElations Observatories, the Solar and Heliospheric Observatory and the Solar Dynamics Observatory), and combined modeling efforts (nonlinear force-free field modeling, Graduated Cylindrical Shell CME modeling, and the Forecasting a CME's Altered Trajectory - ForeCAT model). We aim at better understanding its early evolution and interaction process as well as its interplanetary propagation and related in situ signatures, and finally the resulting impact on the Earth's magnetosphere.

Keywords: Corona; Coronal holes; Coronal mass ejections, initiation and propagation; Coronal mass ejections, interplanetary; Coronal mass ejections, low coronal signatures; Magnetic fields, photosphere; Magnetosphere, geomagnetic disturbances.