  The turbulent-like process associated with ionospheric instabilities, has
been identified as the main nonlinear process that drives the irregularities
observed in the different ionospheric regions. In this complementary study, as
proposed in the first article of this two-paper series [Fornari et al., Adv.
Space Res. 58, 2016], we performed the detrended fluctuation analysis of the
equatorial E-F valley region electron density fluctuations measured from an in
situ experiment performed over the Brazilian territory. The spectral
consistency with the K41 turbulent universality class is analyzed for E-F
valley region from the DFA spectra for four electron density time series. A
complementary detrended fluctuation analysis for four time series of the
F-layer electric field is also presented. Consistent with the results obtained
for the F region, the analysis for the E-F valley region also shows a very high
spectral variation ($\gg50\%$). Thus, the spectral analysis performed in both
parts of the series suggest that a process such as the homogeneous turbulence
K41 ($\beta =-5/3\pm 2\%$) is inappropriate to describe both the fluctuations
of electron density and the electric field associated with the main ionospheric
instabilities.
