A. Reid, M. Mathioudakis, E. Scullion, J. G. Doyle, S. Shelyag, P. Gallagher

Ellerman Bombs with Jets: Cause and Effect

Figure 8. Hα -1.2 Å imaging. A dark chromospheric jet is generated at the EB location. Time is in units of seconds.

Abstract

Ellerman Bombs (EBs) are thought to arise as a result of photospheric magnetic reconnection. We use data from the Swedish 1-m Solar Telescope (SST), to study EB events on the solar disk and at the limb. Both datasets show that EBs are connected to the foot-points of forming chromospheric jets. The limb observations show that a bright structure in the Hα blue wing connects to the EB initially fuelling it, leading to the ejection of material upwards. The material moves along a loop structure where a newly formed jet is subsequently observed in the red wing of Hα. In the disk dataset, an EB initiates a jet which propagates away from the apparent reconnection site within the EB flame. The EB then splits into two, with associated brightenings in the inter-granular lanes (IGLs). Micro-jets are then observed, extending to 500 km with a lifetime of a few minutes. Observed velocities of the micro-jets are approximately 5-10 km s−1, while their chromospheric counterparts range from 50-80 km s−1. MURaM simulations of quiet Sun reconnection show that micro-jets with similar properties to that of the observations follow the line of reconnection in the photosphere, with associated Hα brightening at the location of increased temperature.

Full paper in PDF format

Last Revised: 2015 March 18th