## 7. Radial dependence of the dissipated wave energyFor purposes of an estimation we may base our considerations on the background field given by Parker's Archimedian spiral and hence given by: where is the ecliptic co-latitude and is the solar rotation frequency. We now define for clarification a critical radius where azimuthal and radial field components are just equal given by: . One can then study the radial dependence of for two distinct regions: i.e. for region I: , and for region II: .
With these dependences one evaluates Eq. (58) into the following form: Thus one finds that has the
following For regions AU HELIOS A/B data show that (Tu & Marsch 1995). Comparing this result with Eq. (57) allows one to conclude that , i.e. a nearly flat power spectrum. Thus one derives the following radial dependence of : Therefore one can conclude that the heat source connected with the dissipated wave energy in this region falls off like: .
Evaluating again Eq. (61) we thus arrive at: For a substantially flat spectrum with one therefore derives in this region the following radial dependence: © European Southern Observatory (ESO) 2000 Online publication: December 5, 2000 |