Detection of UHR Frequencies by a Convolutional Neural Network From Arase/PWE Data

S. Matsuda, T. Hasegawa, A. Kumamoto, F. Tsuchiya, Y. Kasahara, Y. Miyoshi, Y. Kasaba, A. Matsuoka, I. Shinohara

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We have developed the automatic detection scheme for upper hybrid resonance (UHR) frequency using a convolutional neural network (CNN) from the electric field spectra obtained by the plasma wave experiment (PWE) aboard Arase. In this paper, we investigate the practical capability of this scheme in terms of actual scientific use case. We find that the average error rate is below 7.8% when the wave frequency is above 30 kHz and the wave spectral intensity is less than 10−5 mV 2/m2/Hz. About 91% of the data obtained by the high-frequency analyzer (HFA) aboard the Arase satellite satisfies these conditions. To improve the accuracy of the determined UHR frequencies in a wide frequency range, we used another receiver, the onboard frequency analyzer (OFA), which enables us to detect low-frequency UHR emissions. We confirmed that the averaged error rate derived by the OFA spectra becomes better than that derived from the HFA spectra in a frequency range below 20 kHz. We report the performance of the UHR frequency determination under the different geomagnetic conditions. We find that the UHR frequency can be determined with good accuracy using the CNN from the frequency-time diagram both during geomagnetically quiet and disturbed conditions. We conclude that the CNN-based UHR frequency determination is a reliable method to derive the electron density along the satellite orbit through observations of UHR frequencies, and this method contributes to studies on dynamics of the plasmasphere.

Original languageEnglish
Article numbere2020JA028075
JournalJournal of Geophysical Research: Space Physics
Issue number10
Publication statusPublished - 2020 Oct 1


  • Arase satellite
  • UHR frequency
  • convolutional neural network
  • inner magnetosphere
  • machine learning
  • plasmasphere

ASJC Scopus subject areas

  • Space and Planetary Science
  • Geophysics


Dive into the research topics of 'Detection of UHR Frequencies by a Convolutional Neural Network From Arase/PWE Data'. Together they form a unique fingerprint.

Cite this