Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...1e...9g&link_type=abstract
Cosmic Particle Acceleration, 26th meeting of the IAU, Joint Discussion 1, 16-17 August, 2006, Prague, Czech Republic, JD01, #9
Physics
Scientific paper
The physical conditions of the acceleration region of a short and intense flare are analyzed. In a previous work, we concluded that the population of accelerated electrons with energies above 250 keV should be negligible in order to explain the microwave and Hard X-Ray spectra. Even more, the high density flux at 7 Ghz (~ 1000 s.f.u.) is originated by the gyrosynchrotron radiation of around 10^35 accelerated electrons in a relatively weak magnetic field of ~ 200 G. The absence of electrons with energies > 250 keV favors a subdreicer electric field as the acceleration mechanism. The number of accelerated electrons impose, however, the necessity of thousands of current sheets. In this work we present the main characteristics of the flare, including EUV and Hard X-Ray images, and total flux from RHESSI and different radio telescopes to support our conclusions, and give constraints to the physical conditions of the acceleration region.
Giménez de Castro Guillermo Carlos
Rezende Costa Joaquim Eduardo
Válio Roque da Silva Adriana
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