Quiet-time GNSS-based VTEC (Code only) climatology over Oukaimeden (Morocco), 2015–2025 (QSL–GIM20)

This repository contains 30-min and daily vertical total electron content (VTEC) products and derived quiet-time climatologies for the GNSS station OUCA at Oukaïmeden Observatory, Morocco (31.2°N, 7.9°W), covering 2015-10-01 to 2025-09-26. Dual-frequency GNSS code data were processed with code-only quality control, satellite differential code biases (DCBs), daily receiver bias estimation, thin-shell mapping to vertical TEC, and aggregation to 30-min and daily statistics. Quiet–Solar–Low (QSL–GIM20) days were selected by intersecting geomagnetically quiet days (GFZ/ISGI Kp), low solar activity (F10.7 ≤ 125 sfu), and daily VTEC agreement within |ΔVTEC| ≤ 20 TECU compared to co-located Global Ionospheric Maps (IONEX). The archive includes 30-min station VTEC time series, daily statistics, the list of QSL–GIM20 days, and summary climatologies used in the associated Advances in Space Reasearch (ASR). All files are provided in CSV and/or Parquet formats with UTC timestamps and documented column schemas.