# Two-sided-loop jet originates from the filament internal reconnection

## TL;DR

This paper reports the first observation of a two-sided-loop jet originating from magnetic reconnection within a single filament, revealing new insights into jet formation mechanisms.

## Contribution

It provides direct observational evidence of filament internal reconnection causing two-sided-loop jets, a process not previously documented.

## Key findings

- Reconnection occurs at crossing points of filament threads.
- Jet outflow speeds are approximately 22.2 km/s and 62.5 km/s.
- Post-reconnection, filament threads become parallel and separate at 2.8 km/s and 8.3 km/s.

## Abstract

Magnetic reconnection driving two-sided-loop jet is typically associated with interactions between an emerging bipole and the overlying horizontal magnetic field, or between filaments from separate magnetic systems. Leveraging high temporal and spatial resolution observations from ground-based and space-borne instruments, we have identified a two-sided-loop jet originating from magnetic reconnection between threads within a single filament. Our observations show that as two initially crossing filamentary threads within the filament converge, reconnection takes place at their intersection. In the Doppler images, distinct redshift and blueshift signals are observed at the locations where the filament threads intersected. This process generates a two-sided-loop jet with outflow speeds of \speed{22.2} and \speed{62.5}. Following reconnection, the original crossing threads transform into two parallel threads that subsequently separate at speeds of \speed{2.8} and \speed{8.3}. This observation offers a new perspective on the mechanisms responsible for jet formation.