Statistical analysis of the F3 layer using the SEALION ionosonde network

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Statistical analysis of the F3 layer using the
SEALION ionosonde network
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36th COSPAR Scientific Assembly Beijing, China,
16 23 July 2006
J. Uemoto 1, T. Maruyama 2, T. Ono 1, S.
Saito 2, M. Iizima 1, A. Kumamoto 1 1
Department of Geophysics, Graduate School of
Science, Tohoku University, Japan 2 National
Institute of Information and Communications
Technology, Japan
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Seasonal dependences of F3 layer occurrence
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Purpose of this study
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Seasonal dependence of the occurrence probability
of the F3 layer has been discussed mainly based
on a single ionosonde data.
For clarifying the mechanism of the F3 layer in
detail, simultaneous observation at conjugate
points is needed.
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What is the SEALION ?
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Southeast Asia Low-latitude Ionospheric Network
Analysis period
Oct., 2004 to Sep., 2005.
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Ionogram examples
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Figs. Examples of ionogram without (left panel)
and with F3 layer (right panel).
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Occurrence probability of F3 layer
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Fig. Occurrence probabilities of the F3 layer at
CMU, CPN and KTB.
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Dip latitudinal dependences
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500
400
300
200
Characteristics and dynamics of the F3 layer at
low latitude region are different from those in
the vicinity of the dip equator.
700
600
500
Virtual Height km
400
300
200
500
400
300
200
31st Mar., 2005
0700
1900
Local Time hrs
Figs. Sequence plots of O-mode echo traces
appeared on ionograms on 31 March, 2005.
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Conclusion
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Acknowledgements
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SEALION is a joint project among the following
institutions and countries
This research was partially supported by the
Grantin-Aid for JSPS Fellows, The Ministry of
Education, Culture, Sports, Science and
Technology, Japan. Activities of three authors
(T. Ono, M. Iizima, and A. Kumamoto) are
supported by the 21st century COE program
Advanced Science and Technology Center for the
Dynamic Earth at Tohoku University.