Abstract Details
| Name: Karthik SB Affiliation: IISER Thiruvananthapuram Conference ID: ASI2024_155 Title : Acoustic Halos in the Solar Atmosphere Authors and Co-Authors : Karthik S B, Dr. S. Krishna Prasad, Dr. Nitin Yadav Abstract Type : Poster Abstract Category : Sun, Solar System, Exoplanets, and Astrobiology Abstract : The Solar Acoustic halo effect is characterized by an acoustic power enhancement at higher frequencies (> 5.5 mHz) than the typical p-mode frequencies. We analyze the data from Helioseismic Magnetic Imager (HMI) and Atmospheric Imaging Assembly (AIA) instruments on board the Solar Dynamics Observatory (SDO by NASA) to characterize the spatio-temporal acoustic power distribution in active regions as a function of the height in the Solar Atmosphere. For this, we use Continuum intensity observed using Magnetically sensitive line, 6173 ˚A and Doppler-gram as well as intensity at 1600 ˚A and 1700 ˚ A. We study the power enhancement around the Sun Spot and other Active regions as a function of wave frequency, magnetic field strength, field inclination, and observation height. We find that acoustic halos occur in the frequency around the range of 8 mHz. Halos are found to be strong functions of Magnetic field strength forming around the range of 50G-200G. We further see the formation of structures with higher relative power around the Inter-network regions, with the structure becoming more pronounced only in higher frequencies. We also look for such Halo signatures in the simulations and further probe the dependency on Magnetic field orientations and strength, and look for the possible mechanism that cause this effect. |