Journal
ADVANCES IN SPACE RESEARCH
Volume 54, Issue 6, Pages 961-968Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.asr.2014.06.005
Keywords
D-region; VLF waves; Mid-latitude ionosphere; Total solar eclipse
Categories
Funding
- Study of near-Earth effects by CME/HSS - Korea Astronomy and Space Science Institute
- Korea Astronomy and Space Science Institute, Republic of Korea
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In this paper, we analyze VLF signals received at Busan to study the the D-region changes linked with the solar eclipse event of 22 July 2009 for very short (similar to 390 km) transmitter receiver great circle path (TRGCP) during local noon time 00:36-03:13 UT (09:36-12:13 KST). The eclipse crossed south of Busan with a maximum obscuration of similar to 84%. Observations clearly show a reduction of similar to 6.2 dB in the VLF signal strength at the time of maximum solar obscuration (84% at 01:53 UT) as compared to those observed on the control days. Estimated values of change in Wait ionospheric parameters: reflection height (h') in km and inverse scale height parameter (beta) in km(-1) from Long Wave Propagation Capability (LWPC) model during the maximum eclipse phase as compared to unperturbed ionosphere are 7 km and 0.055 km(-1), respectively. Moreover, the D-region electron density estimated from model computation shows 95% depletion in electron density at the height of similar to 71 km. The reflection height is found to increase by similar to 7 km in the D-region during the eclipse as compared to those on the control days, implying a depletion in the Lyman-alpha flux by a factor of similar to 7. The present observations are discussed in the light of current understanding on the solar eclipse induced D-region dynamics. (C) 2014 COSPAR. Published by Elsevier Ltd. All rights reserved.
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