Abstract Details


Name: Upasna Baaweja
Affiliation: Aryabhatta Research Institute of Observational Sciences
Conference ID: TVS202510189
Title: Investigation of Co-existence of longitudinal and transverse oscillations in polar plumes observed with Solar Orbiter/EUI
Authors and Co-Authors: Vaibhav Pant, S. Krishna Prasad, Arpit Kumar Shrivastav, Tom Van Doorsselaere, Nancy Narang, Cis Verbeeck, M. Saleem Khan, David Berghmans
Abstract Type: Contributory Presentation
Abstract: Magnetohydrodynamic waves are ubiquitous in the solar atmosphere. The seismology of these waves helps to understand 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 the slow magnetoacoustic waves are propagating with a projected speed of 120 km/s with a periodicity of about 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 provides the first-ever investigation of the simultaneous detection of both wave modes in the polar plumes using the EUI onboard Solar Orbiter.