Dataset from the Troll station for event on May 9, 2019

This dataset contains observations from the all-sky imager (ASI) and the GNSS Ionospheric Scintillation and TEC Monitor (GISTM), a NovAtel GPStation-6 receiver located at the Norwegian Research Station Troll in Dronning Maud Land, Antarctica. The receiver tracks signals from the GPS, GLONASS, and Galileo satellite constellations. In addition to raw observations, it provides 1-minute summary data, including satellite azimuth and elevation angles, carrier-to-noise ratio (C/N0), lock time, code-minus-carrier values, and the amplitude (S4) and phase (σϕ) scintillation indices. The dataset consists of three types of files. 1. High-rate GNSS observations (50 Hz) These files contain raw 50 Hz observations from the Galileo satellites E26 and E31 and the GLONASS satellites R13 and R14. The files are provided in CSV format and include a header describing the recorded parameters. Filename format: IsmRawObs_TRL_20190509_XXX.csv where XXX is the satellite identifier. 2. GNSS observations (1 Hz) These files contain 1 Hz observations from the Galileo, GPS, and GLONASS constellations. The files are provided in text format and include a header describing the recorded parameters. Filename format: REDOBS_xxx_TRL_20190509_202536.txt where xxx denotes the GNSS constellation (GPS, GLONASS, or Galileo). 3. All-sky imager data These files contain ASI images acquired using the 630.0 nm emission filter, which provides the clearest optical representation of the STEVE event observed on 9 May 2019. This work was supported by European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC Consolidator Grant agreement No. 866357, POLAR-4DSpace). Troll Ionosphere Observatory at the Troll research station in Antarctica has been supported by the Research Council of Norway grant numbers 267408 and 322466