  This study aims to provide further evidence for the potential influence of
the global solar magnetic field on localised chromospheric jets, the
macrospicules (MS). To find a connection between the long-term variation of
properties of MS and other solar activity proxies, including e.g. the temporal
variation of the frequency shift of solar global oscillations, sunspot area,
etc., a database overarching seven years of observations was built up. This
database contains 362 MS, based on observations at the 30.4 nm of the
Atmospheric Imaging Assembly (AIA) on-board the Solar Dynamics Observatory
(SDO). Three of the five investigated physical properties of MS show a clear
long-term temporal variation after smoothing the raw data. Wavelet analysis of
the temporal variation of maximum length, maximum area and average velocity is
carried out. The results reveal a strong pattern of periodicities at around
2-year (also referred to as Quasi-Biennial Oscillations -- QBOs). Comparison to
solar activity proxies, that also possess the properties of QBOs, provides some
interesting features: the minima and maxima of QBOs of MS properties occur at
around the same epoch as the minima and maxima of these activity proxies. For
most of the time span investigated, the oscillations are out-of-phase. This
out-of-phase behaviour was also corroborated by a cross-correlation analysis.
These results suggest that the physical processes, that generate and drive the
long-term evolution of the global solar activity proxies, may be coupled to the
short-term local physical processes driving the macrospicules, and, therefore
modulate the properties of local dynamics.
