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Modeling of the Very Low Frequency (Vlf) Radio Wave Signal Profile Due to Solar Flares Using the Geant4 Monte Carlo Simulation Coupled with Ionospheric Chemistry : Volume 13, Issue 3 (07/03/2013)

By Palit, S.

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Book Id: WPLBN0003996686
Format Type: PDF Article :
File Size: Pages 27
Reproduction Date: 2015

Title: Modeling of the Very Low Frequency (Vlf) Radio Wave Signal Profile Due to Solar Flares Using the Geant4 Monte Carlo Simulation Coupled with Ionospheric Chemistry : Volume 13, Issue 3 (07/03/2013)  
Author: Palit, S.
Volume: Vol. 13, Issue 3
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Pal, S., Chakrabarti, S. K., Mondal, S. K., Palit, S., & Basak, T. (2013). Modeling of the Very Low Frequency (Vlf) Radio Wave Signal Profile Due to Solar Flares Using the Geant4 Monte Carlo Simulation Coupled with Ionospheric Chemistry : Volume 13, Issue 3 (07/03/2013). Retrieved from

Description: Indian Centre for Space Physics, 43-Chalantika, Garia Station Road, Kolkata-700084, India. X-ray photons emitted during solar flares cause ionization in the lower ionosphere (~ 60 to 100 km) in excess of what is expected from a quiet sun. Very Low Frequency (VLF) radio wave signals reflected from the D region 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 GEANT4 Monte Carlo simulation code to compute the rate of ionization due to a M-class 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 lower ionosphere. The resulting electron density variation profile is then self-consistently used in the LWPC code to obtain the time variation of the VLF signal change. 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.

Modeling of the Very Low Frequency (VLF) radio wave signal profile due to solar flares using the GEANT4 Monte Carlo simulation coupled with ionospheric chemistry

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