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

## TL;DR

This study analyzes six years of macrospicule data from the Solar Dynamics Observatory, revealing quasi-biennial oscillations in their properties' cross-correlations, which may relate to the solar magnetic dynamo.

## Contribution

It introduces a long-term dataset of macrospicule properties and identifies oscillatory patterns in their correlations linked to solar magnetic activity.

## Key findings

- Detected ~2-year oscillations in macrospicule property correlations
- Oscillations vary between coronal hole and quiet Sun regions
- Wavelet analysis confirms periodic behavior in macrospicule dynamics

## Abstract

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