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Detection of ionospheric perturbations associated with Japanese earthquakes on the basis of reception of LF transmitter signals on the satellite DEMETER

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Figure

Fig. 2. Relative location of the LF transmitter in Fukushima, JJYand the epicenters of the target EQs including Miyagi-oki EQ
Fig. 3. A typical spectrum of electric field intensity (in linear scale).vertical dotted lines correspond to the frequencies (fThis spectrum is computed as the average of SNRs in a rectangu-lar area (latitude:10∼50[deg], longitude:110∼160[deg])
Fig. 4. Analysis methods. (a) SNR plots for 1day, and (b) SNR plots for 3 weeks. (c) Diving the region into 2×2[deg] pixels, and (d)normalized SNR
Fig. 5. Temporal evolution of spatial SNR distributions. (a) 7 days before the EQ, (b) 0 day (EQ day), (c) 10 days after the EQ and (d) 20days after the EQ.
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