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Paper Abstract and Keywords
Presentation 2023-05-19 11:25
An identification of ambient electron density profile in the lower ionosphere by using a temporal variation of VLF earth-ionosphere waveguide propagation
Toshiyuki Irie, Yoshiaki Ando (UEC) EST2023-3
Abstract (in Japanese) (See Japanese page) 
(in English) The use of electromagnetic waves in the very low frequency (VLF; 3-30 kHz) band has been expected to serve as a possible method to continuously observe electron density in the lower ionosphere (60-100 km altitude, D layer). In this study, we develop a method to identify the electron density by using the time variation of the electric field intensity observed at multiple ground stations and verify the validity of the proposed method numerically. The electric field radiated at the JJI transmitter station (22.2 kHz) is calculated using the finite difference time domain (FDTD) method, and we define observation values numerically by postulating electron density profiles. An optimization problem using the FDTD method was solved to recover the time variation of the electron density from the electric field intensities at the ground. The results show that the electron density can be identified within 1 km of altitude for N_e=2.7×10^6-1.6×10^8 m^(-3), which is the range of electron density that influences the earth-ionosphere waveguide propagation at 22.2 kHz.
Keyword (in Japanese) (See Japanese page) 
(in English) very-low-frequency band / earth-ionosphere waveguide propagation / finite-difference time-domain method / / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 45, EST2023-3, pp. 11-16, May 2023.
Paper # EST2023-3 
Date of Issue 2023-05-12 (EST) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF EST2023-3

Conference Information
Committee EST  
Conference Date 2023-05-19 - 2023-05-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Simulation techniques, etc. 
Paper Information
Registration To EST 
Conference Code 2023-05-EST 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An identification of ambient electron density profile in the lower ionosphere by using a temporal variation of VLF earth-ionosphere waveguide propagation 
Sub Title (in English)  
Keyword(1) very-low-frequency band  
Keyword(2) earth-ionosphere waveguide propagation  
Keyword(3) finite-difference time-domain method  
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1st Author's Name Toshiyuki Irie  
1st Author's Affiliation The University of Electro-communications (UEC)
2nd Author's Name Yoshiaki Ando  
2nd Author's Affiliation The University of Electro-communications (UEC)
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Speaker Author-1 
Date Time 2023-05-19 11:25:00 
Presentation Time 25 minutes 
Registration for EST 
Paper # EST2023-3 
Volume (vol) vol.123 
Number (no) no.45 
Page pp.11-16 
#Pages 6 
Date of Issue 2023-05-12 (EST) 

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