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We studied a solar event on June 22, 2011, involving a coronal mass ejection (CME) and a high-speed stream (HSS). The CME was deflected by the HSS, impacting Earth's magnetosphere.

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Area of Science:

  • Solar physics
  • Space weather
  • Plasma physics

Background:

  • Observed a unique plasma and magnetic field configuration near L1 on June 22, 2011.
  • This event featured a magnetic ejecta (ME) and shock signature within a solar wind high-speed stream (HSS).

Purpose of the Study:

  • Investigate the origin of the observed plasma and magnetic field configuration.
  • Analyze the interaction between a coronal mass ejection (CME) and a HSS.
  • Understand the early evolution, propagation, and impact of the CME-HSS event.

Main Methods:

  • Utilized multi-viewpoint data from STEREO, SOHO, and SDO.
  • Employed nonlinear force-free field modeling.
  • Applied Graduated Cylindrical Shell (GCS) CME modeling and the ForeCAT model.

Main Results:

  • Identified the event as an Earth-directed CME from a C7.7 flare interacting with a HSS from a coronal hole.
  • The CME experienced a significant north-eastward deflection due to the coronal hole's magnetic field.
  • The interaction between the CME and HSS occurred at specific heights, influencing the CME's trajectory.

Conclusions:

  • The study elucidates the complex interaction between CMEs and HSSs.
  • Understanding these interactions is crucial for predicting space weather events and their impact on Earth's magnetosphere.
  • The findings contribute to improved modeling of solar eruption propagation and evolution.