Description
In this contribution we investigated the impact of a powerful gamma ray burst (GRB) that
occurred on October 9 2022, on the Earth's environment using a very low frequency
receiver (VLF) to probe the lower ionospheric region (the D region). In addition to the
VLF data analysis, we employed numerical simulation through the Long Wavelength
Propagation Capability code (LWPC) to derive the increase in the D-region electron
density. Our results revealed discernible perturbations in amplitude and phase across all
transmitter paths (NAA, DHO, ICV, and NSC) to the Algiers receiver persisting for 40
minutes. At the maximum of the signal perturbation, the LWPC simulation results showed
a decrease in the mean new reference height h’ from 74 km to 65.71 km, along with an
increase in the sharpness factor $\beta$ from 0.3 km-1 to 0.4875 km-1. Under these new
conditions, the electron density increased from its ambient value (216.10 cm-3 to 33.7 103
cm-3
