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SUMMARY:Center-to-limb variation in Mg II intensities in quiet Sun and act
 ive regions from IRIS
DTSTART;VALUE=DATE-TIME:20230510T070000Z
DTEND;VALUE=DATE-TIME:20230510T071500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115654Z
UID:indico-contribution-318@meetings.aip.de
DESCRIPTION:Speakers: Megha Anand (nter University Centre for Astronomy an
 d Astrophysics\, Post Bag-4\, Ganeshkhind\, Pune 411007\, India)\nThe sola
 r ultraviolet (UV) and extreme ultraviolet (EUV) radiations which are majo
 r contributors to the solar spectral irradiance (SSI) below 4000 Å\,  sig
 nificantly affect the composition and the thermal structure of the Earth's
  atmosphere. The Magnesium II core-to-wing ratio (also known as the Mg II 
 index) is one of the best proxies for solar activity and UV-SSI variabilit
 y. To date\, the Mg II index has been studied\, assuming Sun-as-a-star usi
 ng low (11 Å) and medium spectral resolution (1 Å) data. On the other ha
 nd\, Mg II h and k line pairs being optically thick\, are highly sensitive
  to the thermodynamical properties of the line-forming region and the view
 ing angle. Therefore\, in this study\, we explore the center-to-limb varia
 tion (CLV) in the Mg II line and continuum intensities in various solar fe
 atures like quiet Sun (QS)\, plage\, inter-plage\, sunspot umbra\, and pen
 umbra using the high spatial and spectral resolution data from the Interfa
 ce Region Imaging Spectrometer (IRIS). Our study indicates that plages wit
 h the lowest magnetic field density show the highest limb darkening as opp
 osed to the QS\, whereas the umbra and penumbra show a combination of both
  limb darkening and brightening depending on their photospheric magnetic f
 ield densities. This would provide us an opportunity to understand the imp
 ortance of the spatially resolved Mg II index on the SSI studies.\n\nhttps
 ://meetings.aip.de/event/24/contributions/318/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/24/contributions/318/
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