  We study correlations of the temperature ratio (which is an indicator for
perpendicular ion heating) and the differential flow of the alpha particles
with the power of transverse fluctuations that have wave numbers between 0.01
and 0.1 (normalized to $k_p=1/l_p$, where $l_p$ is the proton inertial length).
We found that both the normalized differential ion speed, $V_{\alpha
p}/V_\mathrm{A}$ (where $V_\mathrm{A}$ is the Alfv\'en speed) and the proton
temperature anisotropy, $T_{\perp p}/T_{\parallel p}$, increase when the
relative wave power is growing. Furthermore, if the normalized differential ion
speed stays below 0.5, the alpha-particle temperature anisotropy, $T_{\perp
\alpha}/T_{\parallel \alpha}$, correlates positively with the relative power of
the transverse fluctuations. However, if $V_{\alpha p}/V_\mathrm{A}$ is higher
than 0.6, then the alpha-particle temperature anisotropy tends to become lower
and attain even values below unity despite the presence of transverse
fluctuations of relatively high amplitudes. Our findings appear to be
consistent with the expectations from kinetic theory for the resonant
interaction of the ions with Alfv\'en/ion-cyclotron waves and the resulting
wave dissipation.
