Thermal and Non-Thermal Properties of Active Region Recurrent Coronal Jets

TL;DR

This study analyzes the thermal and non-thermal plasma properties of recurrent active region coronal jets using multi-wavelength observations, revealing their energetic characteristics and potential impact on solar and heliospheric dynamics.

Contribution

It provides a comprehensive analysis of thermal and non-thermal properties of active region jets, including source reconstruction and spectral analysis, with insights into their energetic contributions and magnetic reconnection sites.

Findings

Active region jets are energetically stronger than polar jets.

Evidence of both cool and hot thermal emissions in jets.

Jets exhibit combined thermal and non-thermal emission characteristics.

Abstract

We present observations of recurrent active region coronal jets and derive their thermal and non-thermal properties, by studying the physical properties of the plasma simultaneously at the base footpoint, and along the outflow of jets. The sample of analyzed solar jets were observed by SDO-AIA in Extreme Ultraviolet and by RHESSI in the X-Ray domain. The main thermal plasma physical parameters: temperature, density, energy flux contributions, etc. are calculated using multiple inversion techniques to obtain the differential emission measure from extreme-ultraviolet filtergrams. The underlying models are assessed, and their limitations and applicability are scrutinized. Complementarily, we perform source reconstruction and spectral analysis of higher energy X-Ray observations to further assess the thermal structure and identify non-thermal plasma emission properties. We discuss a peculiar penumbral magnetic reconnection site, which we previously identified as a ``Coronal Geyser''. Evidence supporting cool and hot thermal emission, and non-thermal emission, is presented for a subset of geyser jets. These active region jets are found to be energetically stronger than their polar counterparts, but we find their potential influence on heliospheric energetics and dynamics to be limited. We scrutinize whether the geyser does fit the non-thermal erupting microflare picture, finding that our observations at peak flaring times can only be explained by a combination of thermal and non-thermal emission models. This analysis of geysers provides new information and observational constraints applicable to theoretical modeling of solar jets.