It is now evident that in large solar energetic particle (SEP) events, particles are of- ten acceletated to MeV energies (and perhaps up to GeV energies) at shock waves driven by coronal mass ejections (CMEs).These energetic particles are of consider- able importance to space weather studies since they serve as a precursor signal for possible disruptive events at the Earth. As a CME-driven shock propagates, expands and weakens, particles accelerated diffusively at the shock can escape upstream and downstream into the interplanetary medium. These escaping energized particles then propagate along the interplanetary magnetic field, experiencing only weak scattering from fluctuations in the interplanetary magnetic field (IMF). We have studied the time- dependent transport of energetic particles accelerated at a propagating shock using a Monte-Carlo approach. Such an approach allows us to obtain the intensity profiles, particle spectrum, angular istribution as well as the particle anisotropies. Such a study provides an excellent theoretical basis for interpreting observations of high-energy particles made at 1 AU by ACE and WIND.
|Publication status||Published - 2002|
|Event||34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA - Houston, TX, USA, United States|
Duration: 10 Oct 2002 → 19 Oct 2002
|Conference||34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA|
|City||Houston, TX, USA|
|Period||10/10/02 → 19/10/02|