Abstract Details

Name: AVYARTHANA GHOSH
Affiliation: IUCAA
Conference ID: ASI2020_283
Title : Dynamic Coupling of the Solar Atmosphere: Instrumentation and Observations
Authors and Co-Authors : Avyarthana Ghosh
Abstract Type : Oral
Abstract Category : Thesis
Abstract : Entitled “Dynamic Coupling of the Solar Atmosphere: Instrumentation and Observations”, this thesis has two-fold objectives. The first objective provides a holistic view of the physical conditions, energy as well as the transfer of mass and energy in the solar atmosphere. It involves observations of granules (Quiet Sun) to active regions (ARs) and loops using several state-of-the-art spectroscopic and imaging instruments spanning a wide range of the electromagnetic spectrum. The former uses observations from the Imaging Magnetograph eXperiment (IMaX) on-board the SUNRISE observatory. These are complimented with imaging and spectroscopic observations of ARs and loops from the Atmospheric Imaging Assembly (AIA), the Helioseismic and Magnetic Imager (HMI) on-board the Solar Dynamics Observatory (SDO) and the Interface Region Imaging Spectrometer (IRIS) and the Extreme-UV and Imaging Spectrometer (EIS) aboard the Hinode, respectively. While these observational studies could, to some extent, explain the magnetic heating predominant in the upper atmosphere, the heating in the lower solar atmosphere is attributed mainly to acoustic heating. The second part of the thesis is dedicated to designing of a few optical components and its end-to-end photometric as well as imaging performance modelling for the SUIT, on-board Aditya-L1 satellite. The telescope aims at extensive full-disk imaging of the photosphere to upper chromosphere between 200-400 nm (Near Ultraviolet, NUV) using a suite of 11 different bandpass filters. These will slice very intricately through the lower solar atmosphere at different heights to complete the picture of acoustic energy deposition, which has not yet been probed extensively in this wavelength domain. The observations from SUIT along with those from the SDO, the Multi-Application Solar Telescope (MAST) and from future facilities like the Solar Orbiter, the Daniel K. Inouye Solar Telescope (DKIST) and the National Large Solar Telescope (NLST) will provide a comprehensive view of the solar atmosphere that has been missing.