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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Simultaneous observations of equatorial plasma bubbles with an all-sky airglow imager and a HF Doppler sounding system in Taiwan

Fig. 2

Doppler spectrograms obtained by the HFD sounding system in Taiwan in March 2015. a Doppler spectrogram obtained from Rx0 for three observation paths, including the intermediate reflection points RP4, RP5, and RP6, during the time interval of 11:00–18:00 UT on March 13, 2015. Two OSS events can be identified during the time intervals of 12:15–13:15 UT (Event 1) and 15:00–17:00 UT (Event 2). b Doppler spectrogram obtained during the time interval of 15:00–19:00 UT on March 16, 2015. A large-scale OSS event was identified during the time interval of 16:15–18:15 UT (Event 3)

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