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LWS TR&T Focus Teams:

Shock acceleration of SEPs by interplanetay CMEs

Team Chair: Martin Lee
Next Team Meeting:
Team-Maintained Web Site:
Team Publications:
Team Members:

  • Cohen, Christina
  • le Roux, Jakobus
  • Mewaldt, Richard
  • Roussev, Ilia
  • von Rosenvinge, Tycho
  • Vourlidas, Angelos

Target description: Understanding large, gradual solar energetic particle (SEP)
events is central to space weather and space climate. Gradual events observed at
Earth are accelerated near the Sun and in the heliosphere by shocks associated
with interplanetary CMEs (ICMEs). However, direct comparisons between
observations, models, and theories have been scarce. It is now clear that in order
to make progress in understanding the solar particle radiation environment near
Earth, a cross-disciplinary approach is needed. It is necessary to combine studies
of shock acceleration of energetic-particles, their propagation, and the evolution
of CMEs in the heliosphere.

Goals and measures of success: The goal of this topic is to establish the spatial
and temporal evolution of large geoeffective gradual SEP events throughout the
heliosphere including acceleration of the SEPs at the CME-driven shock wave,
SEP electron and ion composition, SEP propagation in the solar wind, wave
excitation by SEPs upstream and downstream of the shock, and the resulting
radiation environment in interplanetary space from Earth to Mars orbit.

Types of solicited investigations: Proposals are encouraged which contribute to
our understanding of gradual SEP events using either observations or theoretical
analysis. Numerical and analytical models are both relevant. Proposals are
further encouraged to target fundamental features of these events including
particle injection at the shock, the evolution of the CME-driven shock in the
corona and solar wind, the formation of the upstream wave spectrum, particle
diffusion, particle escape from the shock to Earth orbit, particle anisotropies, ion
fractionation, the role of magnetic field obliquity, and the special behavior of
gradual events close to the Sun or at long times and/or large heliocentric radii.
Theoretical proposals should relate proposed analytical and numerical model
results to observations.


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