Observations of a pulse driven cool polar jet by SDO/AIA
Abhishek K. Srivastava, Kris Murawski

TL;DR
This study combines observations and numerical simulations to demonstrate that a single velocity pulse triggered by low-atmospheric reconnection can produce a polar jet with observed properties in the solar atmosphere.
Contribution
It provides the first strong evidence linking a single velocity pulse to the formation of a polar jet, modeled using realistic solar temperature conditions.
Findings
Numerical simulations match observed jet velocities, height, and lifetime.
A single velocity pulse can generate the observed jet features.
Reconnection in the lower atmosphere likely triggers the velocity pulse.
Abstract
Context. We observe a solar jet at north polar coronal hole (NPCH) using SDO AIA 304 {\deg}A image data on 3 August 2010. The jet rises obliquely above the solar limb and then retraces its propagation path to fall back. Aims. We numerically model this observed solar jet by implementing a realistic (VAL-C) model of solar temperature. Methods. We solve two-dimensional ideal magnetohydrodynamic equations numerically to simulate the observed solar jet. We consider a localized velocity pulse that is essentially parallel to the background magnetic field lines and initially launched at the top of the solar photosphere. The pulse steepens into a shock at higher altitudes, which triggers plasma perturbations that exhibit the observed features of the jet. The typical direction of the pulse also clearly exhibits the leading front of the moving jet. Results. Our numerical simulations reveal that a…
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