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Modeling of very low frequency (VLF) radio wave signal profile due to solar flares using the GEANT4 Monte Carlo simulation coupled with ionospheric chemistry

by S. Palit, T. Basak, S. K. Mondal, S. Pal, S. K. Chakrabarti
Atmospheric Chemistry and Physics ()
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X-ray photons emitted during solar flares cause ionization in the lower ionosphere ({\textasciitilde}60 to 100 km) in excess of what is expected to occur due to a quiet sun. Very low frequency ({VLF}) radio wave signals reflected from the D-region of the ionosphere are affected by this excess ionization. In this paper, we reproduce the deviation in {VLF} signal strength during solar flares by numerical modeling. We use {GEANT}4 Monte Carlo simulation code to compute the rate of ionization due to a M-class flare and a X-class flare. The output of the simulation is then used in a simplified ionospheric chemistry model to calculate the time variation of electron density at different altitudes in the D-region of the ionosphere. The resulting electron density variation profile is then self-consistently used in the {LWPC} code to obtain the time variation of the change in {VLF} signal. We did the modeling of the {VLF} signal along the {NWC} (Australia) to {IERC}/{ICSP} (India) propagation path and compared the results with observations. The agreement is found to be very satisfactory.

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