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Paper Abstract and Keywords
Presentation 2021-12-08 11:20
Modeling of lower Ionospheric perturbations associated with proton aurora using numerical simulation of subionospheric VLF transmitter signals
Hiroki Nomoto, Yasuhide Hobara (UEC), Fuminori Tsuchiya, Asuka Hirai (Tohoku Univ.) EMCJ2021-56
Abstract (in Japanese) (See Japanese page) 
(in English) It is known that Electromagnetic Ion Cyclotron (EMIC) waves generated around the magnetic equator in the magnetosphere scatter ring current protons and relativistic electrons in radiation belt due to wave particle interactions.
The scattered particles lose energy and precipitate from the magnetosphere into the ionosphere.
The precipitating protons produce the Isolated Proton Aurora (IPA).
On the other hand, the relativistic electrons precipitated at the same time perturb the electron density in the lower ionosphere and are observed as amplitude/phase anomalies of electromagnetic waves from ground-based VLF/LF transmitter.
However, VLF/LF transmitter wave is effective to monitor the lower ionosphere condition, the energy of the precipitating electrons cannot be determined directly.
In this study, we construct the spatio-temporal model of the lower ionosphere based upon optical observations of the IPA, EMIC waves, and VLF transmitter wave magnetic amplitude data.
The analyzed event is the propagation anomaly of NLK VLF transmitter signal associated with IPA observed on March 27, 2017 at Athabasca (ATH), Canada.
Two-dimensional FDTD (Finite-Difference Time-Domain) is used for the numerical analysis and temporal change of the VLF transmitter amplitude for NLK-ATH path was calculated under various ionospheric conditions during IPA.
The simulated amplitude time series was compared with that from observations.
As a result, the simulated magnetic field amplitude attenuation due to the lower ionospheric perturbation (9.8 dB) agrees well with the observation (11.0 dB) when the perturbation altitude is assumed to be 60 km.
And the correlation coefficient of amplitude time series between the simulation and observations is 87 %.
The energy required for the electrons to precipitate to this altitude is believed to be in the MeV range.
Observations of VLF/LF transmitter radio waves is a promising tool to continuously monitor the high-energy electron precipitation.
Keyword (in Japanese) (See Japanese page) 
(in English) EMIC wave / Wave-particle interaction / Proton aurora / Subionospheric disturbance / VLF transmitter signal / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 288, EMCJ2021-56, pp. 11-15, Dec. 2021.
Paper # EMCJ2021-56 
Date of Issue 2021-12-01 (EMCJ) 
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 EMCJ2021-56

Conference Information
Committee EMCJ IEE-EMC IEE-SPC  
Conference Date 2021-12-08 - 2021-12-08 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EMCJ 
Conference Code 2021-12-EMCJ-EMC-SPC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Modeling of lower Ionospheric perturbations associated with proton aurora using numerical simulation of subionospheric VLF transmitter signals 
Sub Title (in English)  
Keyword(1) EMIC wave  
Keyword(2) Wave-particle interaction  
Keyword(3) Proton aurora  
Keyword(4) Subionospheric disturbance  
Keyword(5) VLF transmitter signal  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Hiroki Nomoto  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Yasuhide Hobara  
2nd Author's Affiliation The University of Electro-Communications (UEC)
3rd Author's Name Fuminori Tsuchiya  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
4th Author's Name Asuka Hirai  
4th Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2021-12-08 11:20:00 
Presentation Time 25 minutes 
Registration for EMCJ 
Paper # EMCJ2021-56 
Volume (vol) vol.121 
Number (no) no.288 
Page pp.11-15 
#Pages 5 
Date of Issue 2021-12-01 (EMCJ) 

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