| Presentation Title: | Status and future of the atmospheric heating studies for the Sun and sun-like stars |
| Author(s): | Shin Toriumi, Vladimir Airapetian, Kosuke Namekata, Yuta Notsu, Mai Yamashita |
Abstract:
The Sun and sun-like stars commonly host extremely hot atmospheres, i.e., the corona, the chromosphere, and the transition region. It is widely believed that the magnetic field plays a central role in generating these atmospheres, although the exact heating mechanisms remain unclear. By analyzing the Sun-as-a-star multiwavelength observations over the last 10 yr, including SDO/EVE, SORCE, and Hinode/XRT, we derived the power-law scaling relations between the surface magnetic flux and irradiances of various wavelengths, which are sensitive to different temperatures from the corona to the chromosphere. We found that the derived power-law scalings for the current Sun are consistent with those for the sun-like G-type main-sequence stars with ages from 50 Myr to 4.5 Gyr, regardless of stellar age or activity level. This striking consistency is key evidence for the universal heating mechanism for the Sun and sun-like dwarf stars. In the presentation, we will show our recent attempts to expand the analysis to other types of stars (e.g., young stellar objects and M-type stars) and discuss future directions to utilize upcoming SOLAR-C and MUSE as well as new EUV space telescopes, such as LAPYUTA, a candidate for JAXA’s 6th competitively-chosen M-class mission.