Accueil > Séminaires d’Astrophysique > Automne 2006 > Ion Acceleration at an Evolving Coronal/Interplanetary Shock Wave

 

Ion Acceleration at an Evolving Coronal/Interplanetary Shock Wave

Marty Lee (University of New Hampshire, Etats Unis)

Par Stephane Charpinet - 8/01/2007

 

Séminaires d’Astrophysique

de l’Observatoire Midi-Pyrénées


Séminaire de

Marty LEE

(University of New Hampshire, Etats Unis)


Jeudi 28 Septembre 2006 à 11h

CESR


Ion Acceleration at an Evolving Coronal/Interplanetary Shock Wave

The most impressive impulsive energy releases in the heliosphere are the so-called "gradual" solar energetic particle (SEP) events associated with coronal mass ejections (CMEs) from solar active regions. These large events may include ions with energies greater than about 1 GeV/nucleon and often have deleterious effects on humans and assets in space. The history and basic characteristics of these events are first reviewed. Then the current theory for the origin of gradual events is described, based on diffusive shock acceleration of the particles at the coronal/interplanetary shock driven by a rapid CME. An important feature of the ion acceleration and transport is the excitation of hydromagnetic waves by the accelerated protons, which creates a turbulent sheath adjacent to the shock and dramatically increases the rate of ion acceleration. Related processes at comets, the termination shock of the solar wind, and supernovae remnants will also be described.

 

 

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Laboratoire Astrophysique de Toulouse - Tarbes (UMR5572)

CNRS (Midi-Pyrénées)

Univ. Paul Sabatier

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