Abstract Details

Name: aishawnnya sharma
Affiliation: Bahona College
Conference ID: ASI2021_294
Title : Amplitude modulation of Propagating Intensity Waves as observed by AIA/SDO
Authors and Co-Authors : 1. Aishawnnya Sharma Department of Physics, Bahona College, Jorhat-785101, Assam. 2. Durgesh Tripathi Inter-University Centre for Astronomy and Astrophysics, Post Bag-4, Ganeshkhind, Pune 411007,India. 3. R. Erdélyi. i. Solar Physics and Space Plasma Research Centre (SP 2 RC), School of Mathematics and Statistics, University of Sheffield, Hounsfield Road, Hicks Building, Sheffield, S3 7RH, UK. ii. Department of Astronomy, Eötvös Loránd University, Budapest, Pázmány P. sétány 1/A, H-1117, Hungary. 4. G.R. Gupta Physical Research Laboratory, Udaipur Solar Observatory, Devali, Badi Road, Udaipur 313001, India. 5. Gazi A. Ahmed. Department of Physics, Tezpur University, Tezpur 784028, India.
Abstract Type : Poster
Abstract Category : Sun and the Solar System
Abstract : In this talk, we will present our recent results on observation of wave amplitude modulations along a fan loop system as recorded by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. We employ time-distance analysis technique to study the spatio-temporal evolution of propagating intensity disturbances (PIDs) observed along the fan loops. The time-distance maps provide clear presence of 3-min intensity disturbances in all the coronal EUV channels except AIA 94 and 335 Å. We measure the phase speeds of the PIDs and determine their nature as slow-magnetoacoustic waves. The time-distance map at AIA 171 Å, as well as the de-trended light curves at different spatial locations of the map, show an increase and decrease in the amplitude of the propagating oscillations over time. Fouriér power spectrum indicates several frequency-power peaks within 2-3 minutes, along with many other smaller peaks within 1-5 minutes. Wavelet analysis shows a variation of 3-min oscillating power simultaneous to the amplitude variations with time, with a modulation period in the range of 20-30 minutes. Our results provides the viability of occurrence of phenomenon like 'Beat' in the solar atmosphere giving rise to the observed wave amplitude modulations. This study may provide valuable insights into the understanding of the behaviour and possible coupling of slow-magnetoacoustic waves propagating along fan loops.