Quasi-biennial oscillations in the cross-correlation of properties of macrospicules

摘要: Jets, whatever small (e.g. spicules) or large macrospicules) their size, may play a key role in momentum and energy transport from photosphere to chromosphere at least the low corona. Here, we investigate properties of abundant, large-scale dynamic jets observable solar atmosphere: macrospicules (MS). These are observationally more distinct phenomena than little, perhaps ubiquitous, cousins, spicules. Investigation long-term variation help better understanding underlying physics generation coronal heating. Taking advantage high temporal spatial resolution Solar Dynamics Observatory, new dataset, with several hundreds macrospicules, was constructed encompassing period observations over six years. analyse measured relations between these as function time during observed interval. We found that cross-correlations macrospicule display strong oscillatory pattern. Next, wavelet analysis is used provide detailed information about behaviour various MS. For hole significant peak around 2-year period. This also exists partially shifted longer period, case quiet Sun macrospicules. findings be rooted mechanism generating magnetic field, i.e. global dynamo.