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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
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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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 http://www.ebooklibrary.org/


Description
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.

Summary
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

Excerpt
Mondal, S. K., Chakrabarti, S. K., and Sasmal, S.: Detection of ionospheric perturbation due to soft gamma ray repeater SGR J1550-5418 by very low frequency radio waves, Astrophys. Space Sci., 341, 259–264, 2012.; Pal, S., Chakrabarti, S. K., and Mondal, S. K.: Modeling of sub-ionospheric VLF signal perturbations associated with total solar eclipse, 2009 in Indian subcontinent, Adv. Space Res. 50, 196–204, 2012a.; Pal, S., Maji, S. K., and Chakrabarti, S. K.: First ever VLF monitoring of lunar occultation of solar flare during the 2010 annular solar eclipse and its effects on the D-region electron density profile, Planet. Space Sci., 73, 310–317, 2012b.; Pasko, V. P. and Inan, U. S.: Recovery signatures of lightning-associated VLF perturbations as measure of the lower ionosphere, J. Geophys. Res., 99, 17523–17537, 1994.; Rawer, K., Bilitza, D., and Ramakrishnan, S.: Goals and status of the international reference ionosphere, Rev. Geophys., 16, 177–181, 1978.; Rodger, C. J., Clilverd, M. A., and Thomson, N. R.: Modeling of subionospheric VLF signal perturbations associated with earthquakes, Radio Sci., 34, 1177–1185, 1999.; Budden, K. G.: The reflection of very low frequency radio waves at the surface of sharply bounded ionosphere with superimposed magnetic field., Philos. Mag., 42, 833–843, 1951.; Chakrabarti S. K., Pal, S., Sasmal, S., Mondal, S. K., Ray, S., Basak, T., Maji, S. K., Khadka, B., Bhowmick, D., and Chowdhury, A. K.: VLF campaign during the total eclipse of July 22nd, 2009: observational results and interpretations, J. Atmos. Sol.-Terr. Phy., 86, 65–70, 2012.; Chamberlain, J. W.: Theory of Planetary Atmospheres: an Introduction to their Physics and Chemistry, Academic, San Diego, Calif., 1978.; Rowe, J. N., Mitra, A. P., Ferraro, A. J., and Lee, H. S.: An experimental and theoretical study of the D-region – II. semi-empirical model for mid-latitude D-region, J. Atmos. Terr. Phys., 36, 755–785, 1974. \bibitem Schmitter Schmitter, E. D.: Remote sensing planetary waves in the mid-latitude mesosphere using low frequency transmitter signals, Ann. Geophys., 29, 1287–1293, 2011. \bibitem Sui Sui, L., Holman, G. D., Krucker, S., Schwartz, and Tolbert, K.: Modeling Images and Spectra of Solar Flare Observed by RHESSI on 20 February 2002, Kluwer Academic Publishers, 2002.; Wait, J. R. and Spies, K. P.: Characteristics of the earth-ionosphere waveguide for VLF radio waves, NBS Tech. Note 300, 1964.; Thomson, N. R. and Clilverd, M. A.: Solar flare induced ionospheric D-region enhancements from VLF amplitude observations, J. Atmos. Sol.-Terr. Phy., 63, 1729–1737, 2001. \bibitem Tripathi Tripathi, S. C., Khan, P. A., Ahmed, A., Bhawre, P., Purohit, P. K., and Gwal, A. K.: Proceeding of the 2011 IEEE International Conference on Space Science and Communication (IconSpace), 12–13 July 2011, Penang, Malaysia, 2011.; Verronen, P. T., Seppaelae, A., Clilverd, M. A., Rodger, C. J., Kyroelae, E., Enell, C. F., Ulich, T., and Turunen, E.: Diurnal variation of ozone depletion during the October–November 2003 solar proton events, J. Geophys. Res, 110, A09S32, <a href=http://dx.doi.org/10.1029/2004JA010932>doi:10.1029/2004JA010932, 2005.; Wayne, R. P.: Chemistry of Atmospheres, Oxford Univ. Press


 

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