Impact of the 2015 St. Patrick's Day Geomagnetic Storm on Ionospheric TEC Gradients and GNSS Positioning in China

This study made use of geomagnetic storm indices obtained from the OMNI dataset, provided by NASA’s Solar Wind Data Lab (https://cdaweb.gsfc.nasa.gov/cgi-bin/eval1.cgi). Raw GNSS observation data were kindly supplied by the Chinese Multi‑GNSS Network of China (CMONOC) and the International GNSS Service (IGS). CMONOC data can be requested by contacting the National Earthquake Infrastructure Service of China (email: [e-mail]) for registration approval; IGS data are publicly accessible at http://igs.org. All GNSS data processing and precise point positioning analyses were carried out using RTKLIB (http://www.rtklib.com/). We gratefully acknowledge NASA’s Solar Wind Data Lab, CMONOC, IGS, and the RTKLIB development team for making these invaluable resources openly available. As the original datasets and software tools are openly accessible, this dissertation presents only the derived results; for additional data, software settings, or code, please feel free to contact the author. Proper attribution is requested for any reuse of these data or tools.