A model for straight and helical solar jets: II. Parametric study of the plasma beta |
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Etienne Pariat Submitted: 2016-09-28 03:20
Jets are dynamic, impulsive, well-collimated plasma events that develop at
many different scales and in different layers of the solar atmosphere.
Jets are believed to be induced by magnetic reconnection, a process central
to many astrophysical phenomena. Within the solar atmosphere, jet-like events
develop in many different environments, e.g., in the vicinity of active regions
as well as in coronal holes, and at various scales, from small photospheric
spicules to large coronal jets. In all these events, signatures of helical
structure and/or twisting/rotating motions are regularly observed. The present
study aims to establish that a single model can generally reproduce the
observed properties of these jet-like events.
In this study, using our state-of-the-art numerical solver ARMS, we present a
parametric study of a numerical tridimensional magnetohydrodynamic (MHD) model
of solar jet-like events. Within the MHD paradigm, we study the impact of
varying the atmospheric plasma β on the generation and properties of
solar-like jets.
The parametric study validates our model of jets for plasma β ranging
from 10-3 to 1, typical of the different layers and magnetic
environments of the solar atmosphere. Our model of jets can robustly explain
the generation of helical solar jet-like events at various β ≤ 1. This
study introduces the new result that the plasma β modifies the morphology
of the helical jet, explaining the different observed shapes of jets at
different scales and in different layers of the solar atmosphere.
Our results allow us to understand the energisation, triggering, and driving
processes of jet-like events. Our model allows us to make predictions of the
impulsiveness and energetics of jets as determined by the surrounding
environment, as well as the morphological properties of the resulting jets.
Authors: E. Pariat, K. Dalmasse, C.R. DeVore, S.K. Antiochos, J.T. Karpen
Projects: None
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Publication Status: Accepted in Astronomy and Astrophysics
Last Modified: 2016-09-28 10:47
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