Name: Adithya HN
Affiliation: Young Innovators, Bengaluru ,India and Institute for Space Earth-Environmental , Nagoya University, Japan
Conference ID : ASI2022_695
Title : Study of DEM Temperature Variability of Coronal Features in comparison with filter ratio method of Spatially Resolved Images fro
Authors : H. N. Adithya (YIESPL, Bengaluru, India and ISEE/Nagoya University, Japan), R. Kariyappa (IIA, Bengaluru, India and ISEE/Nagoya University, Japan), Satoshi Masuda ( ISEE/Nagoya University, Japan), Kanya Kusano ( ISEE/Nagoya University, Japan), Shinsuke Imada (UT,Japan), J. J. Zender (ESTEC,Netherlands), L. Dame (CNRS/LATMOS , France), Mark Weber (CFA, Harvard, USA), E.E. DeLuca (CFA, Harvard, USA)
Abstract Type: Poster
Abstract Category : Sun and the Solar System
Abstract : Corona is the outermost layer of the Sun, which extends to several thousand kilometers above the visible photosphere. Studying the variation of coronal temperature and individual feature’s temperature along with the solar cycle will be very interesting and important in Solar Physics. The amount of plasma, which is emitting a certain range of temperature along the given line of sight can be described using Differential Emission Measure (DEM). Using DEM analysis, the temperature maps of the full-disk corona and its features are generated. In another method using the filter-ratio technique, the temperature maps of the corona and its features are generated recently. In order to study DEM temperature variations, we have used Al-mesh filtered, full-disk, level-2, X-ray images of the corona obtained from Hinode/XRT. We developed a python algorithm to segment different coronal features (ARs, BGs, CHs & XBPs), and generated the temperature maps of the corona. Using Ti-poly & Al-mesh images, a temperature map is generated using the filter-ratio method. Because of the XRT straylight issue, we had to restrict our analysis for the period March 2008 - May2012. In this paper, for the first time, we will be discussing the variations of temperature of a full-disk corona, and of all the features observed for the period: March 2008 - May2012. Using the filter-ratio method, we found that the average temperature of the full-disk and of all the features show temperature fluctuations and they vary with the solar cycle. The mean temperature estimated for the whole observed period of the full-disk is around 1.45MK and active regions (ARs) will be around 2.02MK, whereas BGs, CHs & XBPs are 1.45MK, 1.38MK, & 1.53MK respectively. Important results from DEM analysis and a comparative study between the temperature variations measured from DEM analysis and filter-ratio method will be discussed in this paper.