An Integrated Observation-Constrained Framework for Modeling D-Region Responses to X-Class Solar Flares During Solar Cycle 25

This repository contains the data and codes used in this study. The archive includes processed Very Low Frequency (VLF) observations recorded at Ariel, Israel; GOES X-ray measurements; FISM2 spectral irradiance data; and supporting solar and geomagnetic indices. MATLAB codes are provided for the VLF, GOES, and LWPC-based analyses, while the Python-based GPI5 framework includes the radiative transfer, photoionization, and five-species ionospheric chemistry calculations used to simulate flare-induced electron density perturbations