# Association of calcium network bright points with underneath photospheric magnetic patches

## TL;DR

This study shows that bright points in the solar chromosphere's network lanes are strongly associated with underlying magnetic patches, with their brightness correlating linearly with magnetic field strength, extending our understanding of solar magnetic structures.

## Contribution

It demonstrates the persistent spatial intermittency of magnetic fields from photosphere to chromosphere and establishes a quantitative correlation between bright points and magnetic field strength in polar regions.

## Key findings

- Bright network points are correlated with magnetic patches.
- Brightness of bright points linearly relates to magnetic field strength.
- Magnetic field intermittency persists from photosphere to chromosphere.

## Abstract

Recent dedicated Hinode polar region campaigns revealed the presence of concentrated kilogauss patches of magnetic field in the polar regions of the Sun which are also shown to be correlated with facular bright points at the photospheric level. In this work, we demonstrate that this spatial intermittency of the magnetic field persists even up to the chromospheric heights. The small-scale bright elements visible in the bright network lanes of solar network structure as seen in the Ca ii H images are termed as network bright points. We use special Hinode campaigns devoted to observe polar regions of the Sun to study the polar network bright points during the phase of last extended solar minimum. We use Ca ii H images of chromosphere observed by Solar Optical Telescope (SOT). For magnetic field information, level 2 data of spectro-polarimeter (SP) is used. We observe a considerable association between the polar network bright points and magnetic field concentrations. The intensity of such bright points is found to be correlated well with the photospheric magnetic field strength underneath with a linear relation existing between them.