  The Lyman-alpha Solar Telescope (LST) on board the Advanced Space-based Solar
Observatory (ASO-S) is the first payload to image the full solar disk and the
solar corona in both white-light (WL) and ultraviolet (UV) H I Lya, extending
up to 2.5 solar radii (Rs). Since the launch of the ASO-S on 9 October 2022,
LST has captured various significant solar activities including flares,
prominences, coronal mass ejections (CMEs). LST covers different passbands of
121.6 nm, 360 nm and 700 nm. The Lya Solar Disk Imager (SDI) has a field of
view (FOV) of 38.4 arcmin and a spatial resolution of around 9.5 arcsec, while
the White-Light Solar Telescope (WST) has a FOV of 38.43 arcmin and a spatial
resolution of around 3.0 arcsec. The FOV of the Lya Solar Corona Imager (SCI)
reaches 81.1 arcmin and its spatial resolution is 4.3 arcsec. The stray-light
level in the 700 nm waveband is about 7.8e-6 MSB (mean solar brightness) at 1.1
Rs and 7.6e-7 MSB at 2.5 Rs, and in the Lya waveband it is around 4.3e-3 MSB at
1.1 Rs and 4.1e-4 MSB at 2.5 Rs. This article will detail the results from
on-orbit tests and calibrations.
