Modeling ground level enhancements of solar cosmic rays

Details Modeling ground level enhancements of solar cosmic rays Modeling ground level enhancements of solar cosmic rays

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.conf...13p&link_type=abstract

10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io

Astronomy and Astrophysics

Astronomy

Scientific paper

The ground level enhancements of solar cosmic rays (GLEs) constitute the relativistic extension of the solar energetic particle (SEP) events and can be defined as the manifestation of a cosmic ray phenomenon in association with powerful solar flares and the fast (> 1000 km/s) Coronal Mass Ejections (CMEs). Among the several techniques available, for modeling the dynamical behavior of GLEs throughout their evolution, the Neutron Monitor Based Anisotropic GLE Pure Power Law (NMBANGLE PPOLA) Model couples primary solar cosmic rays at the top of the Earth's atmosphere with the secondary ones detected at ground level by neutron monitors of the worldwide network. The NMBANGLE PPOLA Model constitutes a new version of the already existing NMBANGLE Model, applied already in various GLEs of the past (events of 20 January 2005, 13 December 2006, a nd 15 April 2001), differing in the solar cosmic ray spectrum assumed. The total output of the NMBANGLE PPOLA model is a multi-dimensional GLE picture that reveals part of the characteristics of the big solar proton events recorded at ground level. In this work, the characteristics and the main considerations of the NMBANGLE PPOLA model shall be presented, as well as the results of its application at the GLE of 15 April 2001. The important role of the existence of an accurate database of neutron monitors, widely distributed around the world, for this kind of studies will be also discussed.

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