Spectropolarimetric evidence for a siphon flow along an emerging magnetic flux tube

TL;DR

This study provides spectropolarimetric evidence for a siphon flow along an emerging magnetic flux tube in the solar atmosphere, revealing detailed magnetic topology and flow dynamics using high-resolution data.

Contribution

It presents the first detailed spectropolarimetric analysis demonstrating a siphon flow along an emerging magnetic flux tube with specific magnetic and velocity configurations.

Findings

Identification of arch-shaped magnetic field lines connecting opposite polarities.

Detection of upflow at the weaker positive polarity footpoint.

Detection of downflow at the stronger negative polarity footpoint.

Abstract

We study the dynamics and topology of an emerging magnetic flux concentration using high spatial resolution spectropolarimetric data acquired with the Imaging Magnetograph eXperiment on board the Sunrise balloon-borne solar observatory. We obtain the full vector magnetic field and the line-of-sight (LOS) velocity through inversions of the Fe I line at 525.02 nm with the SPINOR code. The derived vector magnetic field is used to trace magnetic field lines. Two magnetic flux concentrations with different polarity and LOS velocities are found to be connected by a group of arch-shaped magnetic field lines. The positive polarity footpoint is weaker (1100 G) and displays an upflow, while the negative polarity footpoint is stronger (2200 G) and shows a downflow. This configuration is naturally interpreted as a siphon flow along an arched magnetic flux tube.