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Ann. Geophys., 23, 3047-3053, 2005
www.ann-geophys.net/23/3047/2005/
© European Geosciences Union 2005
Fluxes and fluences of SEP events derived from SOLPENCO
A. Aran1, B. Sanahuja1,2, and D. Lario3
1Departament d’Astronomia i Meteorologia, Universitat de Barcelona, Barcelona, Spain
2CER d’Astrofísica, Física de Partícules i Cosmologia, Unitat associada al CSIC, Barcelona, Spain
3Applied Physics Laboratory. The Johns Hopkins University, Maryland, USA
Abstract. We have developed aran04 a tool for rapid predictions of proton flux and fluence profiles
observed during gradual solar energetic particle (SEP) events and upstream of the associated traveling
interplanetary shocks. This code, named SOLPENCO (for SOLar Particle ENgineering COde), contains a
data base with a large set of interplanetary scenarios under which SEP events develop. These scenarios
are basically defined by the solar longitude of the parent solar activity, ranging from E75 to W90,
and by the position of the observer, located at 0.4 AU or at 1.0 AU, from the Sun. We are now
analyzing the performance and reliability of SOLPENCO. We address here two features of SEP events
especially relevant to space weather purposes: the peak flux and the fluence. We analyze how the peak
flux and the fluence of the synthetic profiles generated by SOLPENCO vary as a function of the
strength of the CME-driven shock, the heliolongitude of the solar parent activity and the particle
energy considered. In particular, we comment on the dependence of the fluence on the radial distance
of the observer (which does not follow an inverse square law), and we draw conclusions about the
influence of the shock as a particle accelerator in terms of its evolving strength and the
heliolongitude of the solar site where the SEP event originated.
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