Different types of plasma turbulence in the process of solar particle acceleration
Por:
Pérez-Peraza J., Miroshnichenko L.I., Vashenyuk E.V., Balabin Y.V., Gallegos-Cruz A.
Publicada:
1 ene 2006
Resumen:
Within the frame of solar cosmic ray (SCR) energy spectra, we present the results of a study of different kinds of turbulence that presumably can co-exist at the Sun in the sources of accelerated particles. On basis of a two-source model of particle generation, one of which is associated with an expanding magnetic loop, we applied the transport equation including adiabatic losses simultaneously with the stochastic acceleration process. Observations show that there are two different populations during some SCR events. One of them, the so-called "Delayed Component" (DC), may be correctly described by stochastic acceleration. The second one, the so-called "Prompt Component" (PC) seems to be described by the deterministic acceleration process in large-scale coronal structures (magnetic neutral current sheets). Co-lateral inferences are obtained for a series of large solar events (29 September 1989, 14 July 2000, 15 April 2001, 28 October and 2 November 2003, and 20 January 2005). We found that the required acceleration efficiencies turned out to be very high, so that for the events of 28 October 2003 and 20 January 2005, adiabatic cooling is negligible. Qualitative inferences point toward a dominated Alfvén turbulence, at least, during the events of 28 October 2003. Our results also provide a new support to the existence of two relativistic particle populations in some SCR events. © 2006 American Institute of Physics.
Filiaciones:
Pérez-Peraza J.:
Instituto de Geofísica, UNAM, C.U., Coyoacan 04510, Mexico, D.F., Mexico
Miroshnichenko L.I.:
Instituto de Geofísica, UNAM, C.U., Coyoacan 04510, Mexico, D.F., Mexico
N.V. Pushkov Institute IZMIRAN, Russian Academy of Sciences, Troitsk, Moscow Region, 142190, Russian Federation
Vashenyuk E.V.:
Polar Geophysical Institute, Apatity, Murmansk Region, 184209, Russian Federation
Balabin Y.V.:
Polar Geophysical Institute, Apatity, Murmansk Region, 184209, Russian Federation
Gallegos-Cruz A.:
UPIISCA, IPN, Depto. de Ciencias Básicas, Té 950, Iztacalco 08400, México, D.F., Mexico
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