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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Occurrence characteristics of electromagnetic ion cyclotron waves at sub-auroral Antarctic station Maitri during solar cycle 24

Fig. 1

a The spectrogram of total magnetic field variation, and b corresponding plot of averaged powers for different frequency bins are depicted as a function of universal time (UT = LT-0.77 h) for EMIC wave activities observed on 13 May 2011. The intervals of EMIC wave activities are indicated in the lower panel and they are marked with black dotted vertical lines. \(\delta _1\) and \(\delta _2\) represent the durations of occurrences of EMIC waves in frequency bin \(f_1\) (0.12–0.5 Hz). The total EMIC wave duration for this day is 1.57 h

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