  Total intensity variability light curves offer a unique insight into the
ongoing debate about the launching mechanism of jets. For this work, we utilise
the availability of radio and $\gamma$-ray light curves over a few decades of
the radio source 3C 84 (NGC 1275). We calculate the multiband time lags between
the flares identified in the light curves via discrete cross-correlation and
Gaussian process regression. We find that the jet particle and magnetic field
energy densities are in equipartition ($k_\textrm{r} = 1.08\pm0.18$). The jet
apex is located $z_\textrm{91.5 GHz}= 22 - 645$ $R_\textrm{s}$ ($2 - 20 \times
10^{-3}$ pc) upstream of the 3 mm radio core; at that position, the magnetic
field amplitude is $B_\textrm{core}^\textrm{91.5 GHz}= 3 - 10$ G. Our results
are in good agreement with earlier studies, which utilised very-long-baseline
interferometry. Furthermore, we investigate the temporal relation between the
ejection of radio and $\gamma$-ray flares. Our results are in favour of the
$\gamma$-ray emission being associated with the radio emission. We are able to
tentatively connect the ejection of features identified at 43 and 86 GHz to
prominent $\gamma$-ray flares. Finally, we compute the multiplicity parameter
$\lambda$ and the Michel magnetisation $\sigma_\textrm{M}$ and find that they
are consistent with a jet launched by the Blandford & Znajek 1977 mechanism.

High Energy Astrophysical Phenomena