Name: Sahel Dey
Affiliation: Indian Institute of Astrophysics & Indian Institute of Science
Conference ID : ASI2022_315
Title : A new mechanism of Spinning Solar Spicules from MHD Simulations
Authors : Sahel Dey and Piyali Chatterjee
Abstract Type: Poster
Abstract Category : Sun and the Solar System
Abstract : High resolution and high cadence observations from SOT instrument - onboard Hinode satellite reveal extremely complex dynamics of Solar Spicules, fine filamentary structures of Solar Chromosphere. Bulk spinning motions (periods of 2-5 mins) among multi-threaded structures of a bunch of spicules are quite abundant near coronal holes where magnetic fields are predominantly open. It is believed that most of the spinning motion is associated with flux emergence from the Solar Photosphere and subsequent reconnection events. Here, we present a series of three-dimensional Magnetohydrodynamic (MHD) simulations that successfully showcased the spinning motion among multiple stands without incorporating flux emergence. We also demonstrate that properties like length, lifetime, kinematics of numerous spicules are in remarkable agreement with observations. With the help of Time-distance diagrams, we detect periods of 2-3 mins for spinning simulated jets and the propagation of transverse oscillations (Kink modes) from both simulation and observation data. We finally demonstrate that most of the bulk rotational motions are due to the interaction of atmospheric swirls with spicules. Often these swirls are excited at the neighborhood of jets by the induced baroclinic instabilities from Spicules.