Authors: Wenda Cao

Big Bear Solar Observatory (BBSO) has operated the 1.6-meter Goode Solar Telescope (GST) for over a decade. GST is one of the highest-resolution solar telescopes in the world. Owing to the extended periods of stable excellent seeing at Big Bear Lake, GST with its high-order adaptive optics (AO), routinely collects diffraction-limited spatial resolution photometric, spectroscopic, and polarimetric data with a high cadence. Since its regular operation began in 2010, GST has been providing the community with open access to observations of the photosphere and chromosphere with unprecedented resolution, significantly advancing our understanding of the origin of solar activity and space weather and the fundamental nature of the solar atmosphere. Current GST users are distributed over 72 universities, institutes, and observatories in 21 countries. BBSO has actively supported campaign observations with NASA space, rocket, and balloon missions (PSP, IRIS, Hinode, SO, NuStar, CLASP-2, BITSE, and SUNRISE) and other large ground-based facilities (ALMA, DKIST, GREGOR). GST now operates six facility-class instruments covering the spectral range from 430 nm – 8.2 μm: VIS (Visible Imaging Spectrometer), NIRIS (Near-InfraRed Imaging Spectropolarimeter), FISS (Fast Imaging Solar Spectrograph) or its modified version – FISSP, BFI (Broad-band Filter Imager), CYRA (Cryogenic infrared spectrograph), and MIRI (Mid-InfraRed Imager). BBSO has kept upgrading GST instrumentation to meet the evolving scientific requirements of users in the U.S. and worldwide. This presentation reports up-to-date progress on developments in instrumentation at BBSO.