| Name: | Karthik SB |
| Affiliation: | IISER Thiruvananthapuram |
| Conference ID : | ASI2024_155 |
| Title : | Acoustic Halos in the Solar Atmosphere |
| Authors : | Karthik S B, Dr. S. Krishna Prasad, Dr. Nitin Yadav |
| Authors Affiliation: | Karthik S B, Indian Institute of Science Education and Research Thiruvananthapuram, Kerala-695551, India
Dr. S. Krishna Prasad, Aryabhatta Research Institute of Observational Sciences, Nainital-263001, India
Dr. Nitin Yadav, Indian Institute of Science Education and Research Thiruvananthapuram, Kerala-695551, India |
| Mode of Presentation: | 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. |
