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Extended energy deposition scenario in collisionless solar polar coronal hole

Summary form only given. The complex scenario of extended energy deposition in the solar polar coronal hole and the acceleration of fast solar wind flowing out of this region have been investigated. The transition point from collisional to collisionless plasma in the polar coronal hole may be taken at about one solar radius above the photosphere, and a three-fluid Maxwell model comprising electrons, protons, and alpha-particles has been employed here. We have derived a 13th order complex polynomial dispersion equation for the wave frequency and estimated quantitative ranges of wave number corresponding to lower hybrid and simultaneous stochastic instabilities. These instabilities may bring about a part of significant energy gain of minor ions. Moreover, for better understanding of electron-ion interaction, we have presented, in detail, the graphical relationship of electron velocity in a plane, perpendicular to the magnetic flux density, versus maximum wave electric field at which significant net heating ceases to take place.