Observations of a rotating macrospicule associated with an X-ray jet

TL;DR

This study investigates the dynamics of a macrospicule and its associated X-ray jet, revealing that the macrospicule exhibits rotation driven by a twisted magnetic flux rope, distinct from the radial outflow of the jet.

Contribution

It provides observational evidence linking macrospicule rotation to magnetic flux rope unwinding, enhancing understanding of solar jet mechanisms.

Findings

Detected Doppler shifts indicating rotation of the macrospicule.

Stereoscopic analysis confirms the rotational motion is not radial.

Macrospicule driven by twisted magnetic flux rope unwinding.

Abstract

We attempt to understand the driving mechanism of a macrospicule and its relationship with a coronal jet. We study the dynamics of a macrospicule and an associated coronal jet captured by multi-spacecraft observations. Doppler velocities both in the macrospicule and the coronal jet are determined by EIS and SUMER spectra. Their temporal evolution is studied using X-ray and He II 304 images. A blueshift of -120+/-15 km/s is detected on one side of the macrospicule, while a redshift of 50+/-6 km/s is found at the base of the other side. The inclination angle of the macrospicule inferred from a stereoscopic analysis with STEREO suggests that the measured Doppler velocities can be attributed to a rotating motion of the macrospicule rather than a radial flow or an expansion. The macrospicule is driven by the unfolding motion of a twisted magnetic flux rope, while the associated X-ray jet is a radial outflow.