# The Magnetic Properties of Heating Events on High-Temperature Active Region Loops

## TL;DR

This study investigates the magnetic properties of impulsively heated coronal loops, revealing that their intensity depends on magnetic field strength and loop length, consistent with hydrodynamic models of impulsive heating.

## Contribution

It provides new empirical relationships between loop intensity, magnetic field, and length, using multi-method magnetic extrapolations and hydrodynamic modeling.

## Key findings

- Loop intensity scales with (B_avg / L)^0.52
- Intensity depends on magnetic and geometric properties
- Hydrodynamic modeling supports impulsive heating with specific scaling laws

## Abstract

Understanding the relationship between the magnetic field and coronal heating is one of the central problems of solar physics. However, studies of the magnetic properties of impulsively heated loops have been rare. We present results from a study of 34 evolving coronal loops observed in the Fe XVIII line component of AIA/SDO 94 A filter images from three active regions with different magnetic conditions. We show that the peak intensity per unit cross-section of the loops depends on their individual magnetic and geometric properties. The intensity scales proportionally to the average field strength along the loop ($B_{avg}$) and inversely with the loop length ($L$) for a combined dependence of $(B_{avg}/L)^{0.52\pm0.13}$. These loop properties are inferred from magnetic extrapolations of the photospheric HMI/SDO line-of-sight and vector magnetic field in three approximations: potential and two Non Linear Force-Free (NLFF) methods. Through hydrodynamic modeling (EBTEL model) we show that this behavior is compatible with impulsively heated loops with a volumetric heating rate that scales as $\epsilon_H\sim B_{avg}^{0.3\pm0.2}/L^{0.2\pm^{0.2}_{0.1}}$.