Speaker
Description
First Name: Upasna
Last Name: Baweja
Affiliation Aryabhatta Research Institute of Observational Sciences
All Authors: Upasna Baweja, Vaibhav Pant, S. Krishna Prasad, Arpit Kumar Shrivastav, Tom Van Doorsselaere, Nancy Narang, Cis Verbeeck, M. Saleem Khan, and David Berghmans
Abstract: Magnetohydrodynamic waves are ubiquitous in the solar atmosphere. The seismology of these waves helps to understand the physical parameters of the solar atmosphere. Earlier studies have reported longitudinal intensity perturbations using the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamic Observatory (SDO) and Alfvénic waves using the Coronal Multichannel Polarimeter (CoMP) in the same magnetic structures. However, their simultaneous detection of both the wave modes in polar plumes using high spatial and temporal resolution remains elusive. In this study, we utilised the high-resolution (210 km) and high-cadence (5 s) data of September 14, 2021, from the Extreme Ultraviolet High-Resolution imager onboard Solar Orbiter to investigate the presence of both slow magnetoacoustic waves and Alfvénic waves in the polar plumes. We reported that slow magnetoacoustic waves are propagating with a projected speed of 120 km/s and a periodicity of approximately 9 minutes. Additionally, the relative amplitudes of these propagating disturbances are about 1.4 to 3.2$\%$ of the background intensity with damping lengths of about 2.4 to 7.1 Mm. The propagating disturbances are also found in the fine-scale substructures in the plumes for the first time. On the other hand, the Alfvénic waves with small displacement amplitude (50-600 km) and high frequency oscillations (with periodicity of 50-250 s) are detected in the same polar plumes. The estimated energy flux carried by Alfvénic waves is 0.7-4.8 W/m$^2$. This work presents the first investigation into the simultaneous detection of both wave modes in the polar plumes using the EUI onboard the Solar Orbiter.