Turbulent Heating in the Solar Wind and in the Solar Corona

Details Turbulent Heating in the Solar Wind and in the Solar Corona Turbulent Heating in the Solar Wind and in the Solar Corona

1995-09-05

arxiv.org/abs/chao-dyn/9509004v1

Nonlinear Sciences

Chaotic Dynamics

Latex, 22 pages, no figures, submitted to Journal of Geophysical Research

Scientific paper

In this paper we calculate the turbulent heating rates in the solar wind using the Kolmogorov-like MHD turbulence phenomenology with Kolmogorov's constants calculated by {\it Verma and Bhattacharjee }[1995b,c]. We find that the turbulent heating can not account for the total heating of the nonAlfv\'enic streams in the solar wind. We show that dissipation due to thermal conduction is also a potential heating source. Regarding the Alfv\'enic streams, the predicted turbulent heating rates using the constants of {\it Verma and Bhattacharjee }[1995c] are higher than the observed heating rates; the predicted dissipation rates are probably overestimates because Alfv\'enic streams have not reached steady-state. We also compare the predicted turbulent heating rates in the solar corona with the observations; the Kolmogorov-like phenomenology predicts dissipation rates comparable to the observed heating rates in the corona [{\it Hollweg, }% 1984], but Dobrowoly et al.'s generalized Kraichnan model yields heating rates much less than that required.

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