Abstract Details
| Name: Ajanta Datta Affiliation: HKBK College of Engineering, Bangalore Conference ID: ASI2019_514 Title : Waves in Solar Atmosphere and their Role in Dynamics of the Corona Authors and Co-Authors : Ajanta Datta Abstract Type : Oral Abstract Category : Thesis Abstract : In this thesis we have studied few coronal phenomena with different spatial and time scales and studied their roles in coronal dynamics We have used simultaneous imaging and spectroscopic data from JOP 165 to understand the nature of the propagating disturbances (PDs). We have detected and shown that there might be quasi-periodic up flows near the footpoint of an active region coronal loop, while in the upper part of loop, waves are dominant. By using emission lines of different layers we have also shown that these waves propagate from the lower atmosphere to the corona. We have studied the wave damping along polar plumes which are open magnetic structures. Using the images from AIA on SDO, frequency dependence of slow wave mode have been studied and found out that the thermal conduction may not be the main source for damping. We have filtered the Hi-C images, which enabled us to see the finer structures at the braided region of active region moss. We have found periodic intensity variation with 30-60s. time period. We also fi nd repeated plasma flows in this region, which is a signature of repeated reconnection. We have confi rmed the presence of large amplitude, high frequency transverse waves. These high frequency dynamics could contribute signi ficantly to the energy balance of the moss regions within active region. We have reported and analysed twisting/untwisting motions during and after a prominence eruption. We have shown that anticlockwise twist of both the footpoints propagated along the spine and induced large scale twist. We have also found that a large amount of twist is transferred to the CME. In this study we have shown the possible magnetic energy transfer through different layers of solar atmosphere. |