# Characteristics of Low-Latitude Coronal Holes near the Maximum of Solar cycle 24

## TL;DR

This study analyzes 288 low-latitude coronal holes during solar cycle 24's maximum, revealing that magnetic flux tubes dominate their magnetic properties and are highly correlated with overall magnetic characteristics.

## Contribution

It provides a detailed statistical analysis of coronal hole magnetic properties and highlights the dominant role of magnetic flux tubes in their magnetic structure.

## Key findings

- Mean magnetic field density is 3.0 +- 1.6 G.
- Unbalanced magnetic flux is concentrated in flux tubes.
- Strong correlation between flux tube properties and overall magnetic characteristics.

## Abstract

We investigate the statistics of 288 low-latitude coronal holes extracted from SDO/AIA-193 filtergrams over the time range 2011/01/01 to 2013/12/31. We analyse the distribution of characteristic coronal hole properties, such as the areas, mean AIA-193 intensities, and mean magnetic field densities, the local distribution of the SDO/AIA-193 intensity and the magnetic field within the coronal holes, and the distribution of magnetic flux tubes in coronal holes. We find that the mean magnetic field density of all coronal holes under study is 3.0 +- 1.6 G, and the percentage of unbalanced magnetic flux is 49 +- 16 %. The mean magnetic field density, the mean unsigned magnetic field density, and the percentage of unbalanced magnetic flux of coronal holes depend strongly pairwise on each other, with correlation coefficients cc > 0.92. Furthermore, we find that the unbalanced magnetic flux of the coronal holes is predominantly concentrated in magnetic flux tubes: 38 % (81 %) of the unbalanced magnetic flux of coronal holes arises from only 1 % (10 %) of the coronal hole area, clustered in magnetic flux tubes with field strengths > 50 G (10 G). The average magnetic field density and the unbalanced magnetic flux derived from the magnetic flux tubes correlate with the mean magnetic field density and the unbalanced magnetic flux of the overall coronal hole (cc > 0.93). These findings give evidence that the overall magnetic characteristics of coronal holes are governed by the characteristics of the magnetic flux tubes.