Gyrosynchrotron emission from electrons with a double power–law energy distribution

GERMÁN CRISTIANI; CARLOS GUILLERMO GIMÉNEZ DE CASTRO; PAULO SIMÕES; CRISTINA HEMILSE MANDRINI

Mar del Plata

Congreso; Reunión Anual de la Asociación Argentina de Astronomía; 2012

Asociación Argentina de Astronomía

Radio enhancements in the microwave range during solar flares is mainly due to gyrosynchrotron emission of high energy electrons. It is usually assumed that the electron population is well-represented by a power-law energy distribution, dN/dE = A E^{-delta}, with a constant spectral index delta along an energy range generally spanning 3 or 4 orders of magnitude. Nevertheless, in hard X-rays and radio frequencies, there is observational evidence that the energy spectrum shows some degree of hardening for energies above a few hundreds of keVs. In this work we explore the consequences, in the gyrosynchrotron emission, when considering a double power-law energy distribution for the electrons with different break energies in several background plasma conditions.