3:30 PM - 3:45 PM
[PEM12-07] Superflare and starspot activity of solar-type stars studied from photometric and spectroscopic data
Keywords:Solar flare, Superflare, starspot, space weather
On the basis of these results, we can estimate rotation period and starspot coverage from these brightness variations, and discuss stellar properties of superflare stars (Notsu+2013 ApJ; Maehara+2017 PASJ). The size distribution of starspots shows the power-law distribution which is on the same line of the size distribution of relatively large sunspots. The frequency-energy distributions for flares originating from spots with different sizes are the same for solar-type stars with superflares and the Sun.
These results suggest that the magnetic activity on solar-type superflare stars and the Sun are caused by the same basic physical processes. Future long-term monitoring of the chromospheric activity and research on possible coronal mass ejections accompanying with superflares will give us an insight on the effects of superflares on (exo)planetary environments, and possible extreme space weather events on the Earth (e.g., Airapetian+2016 Nature Geosciences; Lingam&Loeb 2017 ApJ).