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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Transient ionization of the mesosphere during auroral breakup: Arase satellite and ground-based conjugate observations at Syowa Station

Fig. 3

Cosmic noise absorption event at 2225 UT on June 30, 2017, as observed by the imaging riometer at Syowa Station. The observation frequency was 38.2 MHz. The beam direction is toward the zenith and the beam width is approximately 10°. The data are running averaged by an 8-s window to reduce random noise. The bottom panels show the omnidirectional flux of 82.5–109.5 keV and 0.5–0.6 MeV electrons, as observed by the HEP and XEP instrument of the Arase satellite, respectively

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