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| Titel |
Modeling of very low frequency (VLF) radio wave signal profile due to solar flares using the GEANT4 Monte Carlo simulation coupled with ionospheric chemistry |
| VerfasserIn |
S. Palit, T. Basak, S. K. Mondal, S. Pal, S. K. Chakrabarti |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 18 ; Nr. 13, no. 18 (2013-09-16), S.9159-9168 |
| Datensatznummer |
250085691
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| Publikation (Nr.) |
 copernicus.org/acp-13-9159-2013.pdf |
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| Zusammenfassung |
| X-ray photons emitted during solar flares cause ionization in the lower
ionosphere (~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 GEANT4 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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