Esa Solar orbiter sends the closet image of our SUN. This orbiter launched in FEB 2020, Last month it sends numerous picture of in close proximity.
This Pictures are currently available in ESA official Website:
https://www.esa.int/Science_Exploration/Space_Science/Solar_Orbiter/Solar_Orbiter_s_first_views_of_the_Sun_image_gallery
These images are taken by solar probe at 17nm wavelength which is the Extreme ultra violet wavelength in Electromagnetic spectrum. This reveals the upper atmosphere of SUN which is named as Corona. These corona will have the temperature ranges from 1 million degree Celsius to 2 million degree Celsius.
This analysis are taken on MAY30, 2020 during this time solar probe roughly halfway distance between the sun and earth.