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The solar group at the National Astronomical Observatory of Japan isconducting synoptic solar observations with the Solar Flare Telescope. While itis a part of a long-term solar monitoring, contributing to the study of solardynamo governing solar activity cycles, it is also an attempt at contributingto space weather research. The observations include imaging with filters forH$\alpha$, Ca K, G-band, and continuum, and spectropolarimetry at thewavelength bands including the He I 1083.0 nm / Si I 1082.7 nm and the Fe I1564.8 nm lines. Data for the brightness, Doppler signal, and magnetic fieldinformation of the photosphere and the chromosphere are obtained. In additionto monitoring dynamic phenomena like flares and filament eruptions, we cantrack the evolution of the magnetic fields that drive them on the basis ofthese data. Furthermore, the magnetic field in solar filaments, which developsinto a part of the interplanetary magnetic cloud after their eruption andoccasionally hits the Earth, can be inferred in its pre-eruption configuration.Such observations beyond mere classical monitoring of the Sun will hereafterbecome crucially important from the viewpoint of the prediction of spaceweather phenomena. The current synoptic observations with the Solar FlareTelescope is considered to be a pioneering one for future synoptic observationsof the Sun with advanced instruments.

Synoptic solar observations of the Solar Flare Telescope focusing on space weather