Demonstrations that the Solar Wind is Not Accelerated By Waves or Turbulence

Details Demonstrations that the Solar Wind is Not Accelerated By Waves or Turbulence Demonstrations that the Solar Wind is Not Accelerated By Waves or Turbulence

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...711.1044r&link_type=abstract

The Astrophysical Journal, Volume 711, Issue 2, pp. 1044-1050 (2010).

Astronomy and Astrophysics

Astronomy

4

Magnetic Fields, Solar Wind, Sun: Corona

Scientific paper

The present work uses observations and theoretical considerations to provide both qualitative and quantitative arguments that hydromagnetic waves, whether turbulent or not, cannot produce the acceleration of the fast solar wind and the related heating of the open solar corona. Waves do exist, and can play a role in the differential heating and acceleration of minor ions, but their amplitudes are not sufficient to power the wind, as demonstrated by extrapolation of magnetic spectra from Helios and Ulysses observations. Dissipation mechanisms invoked to circumvent this conclusion cannot be effective for a variety of reasons. In particular, turbulence does not play a strong role in the corona as shown both by observations of coronal striations and other features, and by theoretical considerations of line tying to a nonturbulent photosphere, nonlocality of interactions, and the nature of the kinetic dissipation. We consider possible "ways out" of the arguments presented, and suggest that in the absence of wave or turbulent heating and acceleration, the chromosphere and transition region become the natural source, if yet unproven, of open coronal energization through the production of nonthermal particle distributions.

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