A new mechanism for excitation of quasiperiodic, fast-propagating waves on both sides of a coronal mass ejection

In a latest study revealed in The Astrophysical Journal, Hu Jialiang and Prof. Lin Jun from Yunnan Observatories (YNAO) of the Chinese language Academy of Sciences and their collaborators proposed a brand new mechanism for the era of large-scale quasiperiodic fast-propagating (QFP) magnetoacoustic waves on each side of coronal mass ejection (CME).

The magnetized solar environment, a extremely structured medium, helps varied sorts of wave era and propagation. The quasi-periodic wave trains within the corona (QFP waves) are coronal disturbance phenomena noticed by the Atmospheric Imaging Meeting (AIA) on the Photo voltaic Dynamics Observatory (SDO). These wave fronts, interpreted as fast-mode magnetoacoustic waves, encompass steady, slender arc buildings, able to speedy propagation at speeds as much as 1416 km/s.

Based mostly on present observational constraints, the origin of QFP waves stays unclear. Quite a few mechanisms have been proposed to elucidate the connection between CMEs or flares and QFP waves, however a definitive conclusion has but to be reached. This research sheds new gentle on the origin of QFP waves.

Numerical simulations revealed that magnetic flux rope containing helical magnetic buildings displays waveguide properties. When surrounding coronal magnetic buildings destabilize, oscillations happen throughout the flux rope. For the reason that magnetic flux rope will not be an ideal waveguide, the interior oscillations propagate to the boundaries and partially leak into the encircling corona, forming the noticed QFP waves.

To realize a deeper understanding of the origin of QFP waves, the researchers analyzed the propagation traits of disturbances by calculating velocity divergence at completely different instances, yielding outcomes according to observations.

Moreover, artificial photographs primarily based on simulated knowledge in excessive ultraviolet and white light extremely reproduced precise observational outcomes. This consistency of the simulation outcome with commentary demonstrated that the leakage of inner disturbances from the flux rope, performing as a waveguide, kinds a multi-wavefront construction and represents an affordable mechanism for the era of QFP waves.