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A rigorous analytical study of the dispersion relations of weakly amplifiedtransverse fluctuations with wave vectors ($\vec{k}\parallel \vec{B}$) parallelto the uniform background magnetic field $\vec{B}$ in an anisotropicbi-Maxwellian magnetized electron-proton plasma is presented. We determine theconditions for which the weakly amplified LH-handed polarizedAlfven-proton-cyclotron and RH-handed polarizedAlfven-Whistler-electron-cyclotron branches can be excited. The results of ourinstability study are applied to the observed solar wind magnetic turbulence.The Alfvenic instability diagram explains well the main characteristicproperties of the observed solar wind fluctuations. Especially, the observedconfinement limits at small parallel plasma beta values are explained.

Linear theory of weakly amplified, parallel propagating, transverse temperature anisotropy instabilities in magnetized thermal plasmas