English

Quasi-periodic spicule-like cool jets driven by Alfv\'en pulses

Solar and Stellar Astrophysics 2022-02-02 v1

Abstract

We perform a 2.5 dimensional magnetohydrodynamic (MHD) simulation to understand a comprehensive view of the formation of spicule-like cool jets due to initial transverse velocity pulses akin to Alfv\'en pulses in the solar chromosphere. We invoke multiple velocity (VzV_{z}) pulses between 1.5 and 2.0 Mm in the solar atmosphere, which create the initial transverse velocity perturbations. These pulses transfer energy non-linearly to the field aligned perturbations due to the ponderomotive force. This physical process further creates the magnetoacoustic shocks followed by quasi-periodic plasma motions in the solar atmosphere. The field aligned magnetoacoustic shocks move upward which subsequently cause quasi-periodic rise and fall of the chromospheric plasma into the overlying corona as a thin and cool spicule-like jets. The magnitude of the initial applied transverse velocity pulses are taken in the range of 50-90 km s1s^{-1}. These pulses are found to be strong enough to generate the spicule-like jets. We analyze the evolution, kinematics and energetics of these spicule-like jets. We find that the transported mass flux and kinetic energy density are substantial in the localized solar-corona. These mass motions generate in\it in situsitu quasi-periodic oscillations on the scale of \simeq 4.0 min above the transition region.

Keywords

Cite

@article{arxiv.2202.00501,
  title  = {Quasi-periodic spicule-like cool jets driven by Alfv\'en pulses},
  author = {B. Singh and A. K. Srivastava and K. Sharma and S. K. Mishra and B. N. Dwivedi},
  journal= {arXiv preprint arXiv:2202.00501},
  year   = {2022}
}

Comments

15 pages, 9 figures, MNRAS (in press)