UBAI Catalog of Monthly Averaged Sunspot Activity Indices (1932–2000)

The dataset "UBAI Catalog of Monthly Averaged Sunspot Activity Indices (1932–2000)" contains digitized time series of key sunspot activity indices derived from systematic solar observations conducted at the Ulugh Beg Astronomical Institute (UBAI), formerly the Tashkent Astronomical Observatory (TAO), as part of the USSR Sun Service program.
The dataset includes three primary indices:
the monthly averaged relative sunspot number (Wolf number),
the monthly averaged sunspot group number, and
the monthly averaged total sunspot area, expressed in millionths of the solar hemisphere.
The catalog covers the period 1932–2000, encompassing over six complete solar cycles. These indices serve as essential indicators of solar magnetic activity and are widely used in solar physics, space weather studies, and long-term climate research.
The purpose of this dataset is to preserve and provide open access to a unique historical record of solar activity, contributing to global efforts in reconstructing and analyzing long-term variations in solar magnetism and its potential impacts on Earth.