  W2 (CXOGlb J002415.8-720436) is a cataclysmic variable (CV) in the Galactic
globular cluster 47 Tucanae. Its modulation was discovered within the CATS@BAR
project. The source shows all the properties of magnetic CVs, but whether it is
a polar or an intermediate polar is still a matter of debate. This paper
investigates the spectral and temporal properties of the source, using all
archival X-ray data from Chandra and eROSITA Early Data Release, to establish
whether the source falls within the category of polars or intermediate polars.
We fitted Chandra archival spectra with three different models: a power law, a
bremsstrahlung and an optically thin thermal plasma. We also explored the
temporal properties of the source with searches for pulsations with a power
spectral density analysis and a Rayleigh test ($Z_n^2$). W2 displays a mean
luminosity of $\sim 10^{32}$ erg s$^{-1}$ over a 20-year span, despite lower
values in a few epochs. The source is not detected in the latest observation,
taken with Chandra in 2022, and we infer an X-ray luminosity $\leq 7 \times
10^{31}$ erg s$^{-1}$. The source spectral shape does not change over time and
can be equally well fitted with each of the three models, with a best-fit
photon index of 1.6 for the power law and best-fit temperatures of 10 keV for
both the bremsstrahlung and the thermal plasma models. We confirm the
previously detected period of 8649 s, ascribed to the binary orbital period,
and found a cycle-to-cycle variability associated with this periodicity. No
other significant pulsation is detected. Considering the source orbital period,
luminosity, spectral characteristics, long-term evolution and strong
cycle-to-cycle variability, we suggest that W2 is a magnetic CV of the polar
type.
