Variations of the effective height of the lower ionosphere by results of analysis of tweek-atmospherics. Preliminary results

2017 ◽  
Author(s):  
A. P. Krivonos ◽  
A. V. Shvets ◽  
S. M. Khmara
Keyword(s):  
Lower Ionosphere ◽  
Effective Height ◽  
Preliminary Results ◽  
Tweek Atmospherics

scholarly journals Estimating the lower ionosphere height and lightning location using multimode “tweek” atmospherics

2014 ◽  
Vol 108 ◽  
pp. 1-9 ◽  
Author(s):  
A.V. Shvets ◽  
T.M. Serdiuk ◽  
Y.V. Gorishnyaya ◽  
Y. Hobara ◽  
M. Hayakawa
Keyword(s):  
Lower Ionosphere ◽  
Tweek Atmospherics

scholarly journals Evaluating parameters of conductivity profile of the lower ionosphere by tweek-atmospherics

2015 ◽  
Vol 20 (1) ◽  
pp. 40-47
Author(s):  
A. Shvets ◽  
◽  
T. Serdiuk ◽  
A. Krivonos ◽  
Yu. Goryshnya ◽  
...  
Keyword(s):  
Lower Ionosphere ◽  
Tweek Atmospherics ◽  
Conductivity Profile

scholarly journals Higher harmonic tweek sferics observed at low latitude: estimation of VLF reflection heights and tweek propagation distance

2008 ◽  
Vol 26 (6) ◽  
pp. 1451-1459 ◽  
Author(s):  
S. Kumar ◽  
A. Kishore ◽  
V. Ramachandran
Keyword(s):  
Attenuation Factor ◽  
Lower Ionosphere ◽  
Propagation Distance ◽  
Transverse Magnetic ◽  
Pacific Region ◽  
Low Latitude ◽  
Transverse Magnetic Mode ◽  
Magnetic Mode ◽  
Tweek Atmospherics ◽  
Higher Harmonic

Abstract. Lightning generated signals recorded at a low-latitude station, Suva (18.2° S, 178.3° E) Fiji, in the South Pacific region, during September 2003–July 2004, are used to study the propagation features and the reflection heights of tweek atmospherics in the waveguide formed by the Earth's surface and the lower ionosphere. Tweeks are observed only during the local night and the maximum harmonic (n) recorded is six. The occurrence of tweeks with higher n progressively decreases as n increases. The dispersed part of tweeks decreases as n increases. The attenuation factor has been calculated for tweeks with n=1–3. The ionospheric reflection heights obtained assuming the transverse magnetic mode of propagation for tweek signals vary from 83–92 km. A higher harmonic of the same tweek is reflected from about 2.0 km higher than the lower harmonic. For 90% of tweeks, propagation distances are estimated to be between 1000–5000 km. Tweeks with lower n propagate longer distances than the tweeks with higher n.

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