We study the formation and evolution of a turbulent spectrum of Alfvén waves driven by reflection off the solar wind density gradients, starting from the coronal base up to 17 solar radii, well beyond the Alfvénic critical point, and using a 2D shell model to describe nonlinear interactions. We find that the turbulent spectra are influenced by the nature of reflected waves. Close to the base, these give rise to a flatter and steeper spectrum for the outgoing and reflected waves respectively. At higher heliocentric distance both spectra evolve toward an asymptotic Kolmogorov spectrum. The turbulent dissipation is found to account for at least half of the heating required to sustain the background imposed solar wind and its shape is found to be determined by the reflection-determined turbulent heating below 1.5 solar radii. Therefore reflection and reflection-driven turbulence are shown to play a key role in the acceleration of the fast solar wind and origin of the turbulent spectrum found at 0.3 AU in the heliosphere
Turbulence in the Sub-Alfvenic Solar Wind Driven by Reflection of Low-Frequency Alfven Waves (Invited) / A. Verdini;M. M. Velli;E. Buchlin. - ELETTRONICO. - (2009), pp. C7-C7. (Intervento presentato al convegno American Geophysical Union, Fall Meeting 2009 nel 2009-#dec#).
Turbulence in the Sub-Alfvenic Solar Wind Driven by Reflection of Low-Frequency Alfven Waves (Invited)
VERDINI, ANDREA;VELLI, MARCO;
2009
Abstract
We study the formation and evolution of a turbulent spectrum of Alfvén waves driven by reflection off the solar wind density gradients, starting from the coronal base up to 17 solar radii, well beyond the Alfvénic critical point, and using a 2D shell model to describe nonlinear interactions. We find that the turbulent spectra are influenced by the nature of reflected waves. Close to the base, these give rise to a flatter and steeper spectrum for the outgoing and reflected waves respectively. At higher heliocentric distance both spectra evolve toward an asymptotic Kolmogorov spectrum. The turbulent dissipation is found to account for at least half of the heating required to sustain the background imposed solar wind and its shape is found to be determined by the reflection-determined turbulent heating below 1.5 solar radii. Therefore reflection and reflection-driven turbulence are shown to play a key role in the acceleration of the fast solar wind and origin of the turbulent spectrum found at 0.3 AU in the heliosphereI documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.