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

Abstract

Abstract We present the results of multiwavelength, co-spatial and near co-temporal observations of jets above a sunspot light bridge (LB). The data were obtained with the Solar Optical Telescope on board Hinode, the Interface Region Spectrograph (IRIS) and the Atmospheric Imaging Assembly (AIA) on the Solar Dynamic Observatory. Most of the jets in the Ca ii H images show decreasing brightness with height while in the IRIS slit-jaw images at 1330 Å 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 wavebands 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 TR and corona above sunspots.