Fine structure above a light bridge in the transition region and corona

TL;DR

This study investigates jets above a sunspot light bridge using multi-wavelength observations, revealing their dynamic behavior, heating to coronal temperatures, and their role in transferring mass and energy to higher solar atmospheric layers.

Contribution

It provides detailed multi-instrument observations of jet dynamics and heating above a sunspot light bridge, highlighting their potential in energy transfer to the corona.

Findings

Jets show decreasing brightness with height in Ca II H images.

Jets exhibit rising and falling motions with similar speeds.

Jets' leading edges are heated to coronal temperatures.

Abstract

We present the results of multi wavelength, co-spatial and near co-temporal observations of jets above a sunspot light bridge. The data were obtained with the Solar Optical Telescope (SOT) on board Hinode, the Interface Region Spectrograph (IRIS) and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamic Observatory (SDO). Most of the jets in the Ca II H images show decreasing brightness with height while in the IRIS slit jaw images at 1330 \AA~ jets show a bright leading edge. These jets show rising and falling motion as evident from the parabolic profile obtained from the time-distance diagram. The rising and falling speeds of the jets are similar. These jets show a coordinated behaviour between neighbouring jets moving jointly up and down. Some of the jets show a plasma ejection from the leading edge which is also hotter at the transition region (TR) and coronal temperatures . A Similar behaviour is seen in the AIA wave bands that suggests that jets above the LB reach up to the lower corona and the leading edges are heated up to coronal temperatures. Such jets are important means of transfer mass and energy to the transition region and corona above sunspots.