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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

From: High Frequency Analyzer (HFA) of Plasma Wave Experiment (PWE) onboard the Arase spacecraft

Fig. 7

Automatic determination of UHR frequency. a Spectrogram measured by HFA. b The emissions with an intensity greater than 4 × 10−8 Vm−1Hz−1/2 are selected out as candidates of UHR frequency (red). c Known artificial noises are removed. d Median filter is applied. e The emissions with a bandwidth larger than 200 kHz are removed. f The upper limit frequency of the emissions. Blue curves indicate the electron cyclotron frequency from Arase/MGF

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