Ryuho Kataoka

Ryuho Kataoka

Principal Research Scientist at OIST

Publications

You can also find my articles on my Google Scholar profile. The list of publications before 2023 is here (PDF file).

Hokkaido auroras

Published in submitted to JSWSC, 2025

Multi-event study of Hokkaido aurora events

Recommended citation: Nakayama and Kataoka (2026). "Hokkaido auroras " JSWSC, submitted. https://doi.org/*

Precision Spectral Measurements of Chronium and Titanium from 10 to 250 GeV/n and Sub-Iron to Iron Ratio with the Calorimetric Electron Telescope on the International Space Station

Published in Physical Review Letters, 2025

sub-Fe paper

Recommended citation: Adriani, O. et al. (CALET Collaboration) (2025). "Precision Spectral Measurements of Chronium and Titanium from 10 to 250 GeV/n and Sub-Iron to Iron Ratio with the Calorimetric Electron Telescope on the International Space Station" Physical Review Letters. 135, 021002. https://doi.org/10.1103/py17-74rk

Rigidity spectrum and its solar cycle variation of the north-south anisotropy in galactic cosmic-rays observed by ground-based muon detectors

Published in ApJ, 2024

GCR north-south anisotropy paper

Recommended citation: Kozai, M., Y. Hayashi, K. Fujii, K. Munakata, C. Kato, N. Miyashita, A. Kadokura, R. Kataoka, S. Miyake, M. L. Duldig, J. E. Humble, and K. Iwai (2024). "Rigidity spectrum and its solar cycle variation of the north-south anisotropy in galactic cosmic-rays observed by ground-based muon detectors" ApJ. 977, 160. https://doi.org/10.3847/1538-4357/ad8577

Global analysis of the extended cosmic-ray decreases observed with world-wide networks of neutron monitors and muon detectors; temporal variation of the rigidity spectrum and its implication

Published in ApJ, 2024

phantom Forbush?

Recommended citation: Munakata et al. (2024). "Global analysis of the extended cosmic-ray decreases observed with world-wide networks of neutron monitors and muon detectors; temporal variation of the rigidity spectrum and its implication" ApJ. 974, 283. https://doi.org/10.3847/1538-4357/ad7466

Formation mechanism of fingers that protrude eastward from the Io plasma disk during the interchange instability

Published in Journal of Geophysical Research: Space Physics, 2024

Jupiter paper

Recommended citation: Tanaka, T., Ebihara, Y., Watanabe, M., Fujita, S., & Kataoka, R. (2024). "Formation mechanism of fingers that protrude eastward from the Io plasma disk during the interchange instability" Journal of Geophysical Research: Space Physics. 129, e2024JA032559 https://doi.org/10.1029/2024JA032559

Magnetic Storm-Time Red Aurora as Seen From Hokkaido, Japan on 1 December 2023 Associated With High-Density Solar Wind

Published in Geophysical Research Letters, 2024

This paper is our first citizen science.

Recommended citation: Kataoka, R., Miyoshi, Y., Shiokawa, K., Nishitani, N., Keika, K., Amano, T., & Seki, K. (2024). "Magnetic storm-time red aurora as seen from Hokkaido, Japan on 1 December 2023 associated with high-density solar wind" Geophysical Research Letters. 51, e2024GL108778. https://doi.org/10.1029/2024GL108778

Comparative Observations of the Outer Belt Electron Fluxes and Precipitated Relativistic Electrons

Published in Geophysical Research Letters, 2024

This paper shows the semiannual variation of REP events.

Recommended citation: Vidal-Luengo, S. E., Blum, L. W., Bruno, A., Guzik, T. G., de Nolfo, G., Ficklin, A. W., et al. (2024). "Comparative observations of the outer belt electron fluxes and precipitated relativistic electrons" Geophysical Research Letters. 51, e2024GL109673. https://doi.org/10.1029/2024GL109673

Thermospheric nitric oxide energy budget during extreme geomagnetic storms: a comparative study

Published in Frontiers in Astronomy and Space Sciences, 2024

This paper discussed the cooling of the thermosphere during magnetic storms.

Recommended citation: Bag T, Kataoka R, Ogawa Y, Fujiwara H, Li Z, Singh V, Sivakumar V, Sridharan S, Pirnaris P and Tourgaidis T (2024). "Thermospheric nitric oxide energy budget during extreme geomagnetic storms: a comparative study " Front. Astron. Space Sci.. 11:1273079. https://doi.org/10.3389/fspas.2024.1273079

Multiple convection cells induced by in‐front and off‐front interactions between the obliquely northward IMF and the geomagnetic field

Published in Journal of Geophysical Research: Space Physics, 2024

This paper discussed the origin of NBZ convection.

Recommended citation: Tanaka, T., Ebihara, Y., Watanabe, M., Fujita, S., & Kataoka, R. (2024). "Multiple convection cells induced by in‐front and off‐front interactions between the obliquely northward IMF and the geomagnetic field " Journal of Geophysical Research: Space Physics. 129, e2023JA031994. https://doi.org/10.1029/2023JA031994

Characterization of Relativistic Electron Precipitation Events Observed by the CALET Experiment Using Self-Organizing-Maps

Published in Journal of Geophysical Research: Space Physics, 2024

This paper shows the AI analysis of REP events.

Recommended citation: Vidal-Luengo, S. E., Blum, L. W., Bruno, A., Ficklin, A. W., de Nolfo, G., Guzik, T. G., et al. (2024). "Characterization of Relativistic Electron Precipitation Events Observed by the CALET Experiment Using Self-Organizing-Maps" Journal of Geophysical Research: Space Physics. 129, e2024JA032481 http://dx.doi.org/10.1029/2024JA032481

On the Spatial and Temporal Evolution of EMIC Wave-Driven Relativistic Electron Precipitation: Magnetically Conjugate Observations From the Van Allen Probes and CALET

Published in Geophysical Research Letters, 2024

This paper discusses the REP events at ISS associated with EMIC waves.

Recommended citation: Blum, L. W., Bruno, A., Capannolo, L., Ma, Q., Kataoka, R., Torii, S., & Baishev, D. (2024). "On the Spatial and Temporal Evolution of EMIC Wave-Driven Relativistic Electron Precipitation: Magnetically Conjugate Observations From the Van Allen Probes and CALET" Studies in Japanese Literature and Culture. 51, e2023GL107087 https://doi.org/10.1029/2023GL107087

Atmospheric Ionizations by Solar X-Rays, Solar Protons, and Radiation Belt Electrons in September 2017 Space Weather Event

Published in Studies in Japanese Literature and Culture, 2023

This paper used PHITS simulation to evaluate the atmospheric impacts of Sep 2017 space weather event.

Recommended citation: Murase, K., Kataoka, R., Nishiyama, T., Sato, K., Tsutsumi, M., Tanaka, Y., et al. (2023). "Atmospheric Ionizations by Solar X-Rays, Solar Protons, and Radiation Belt Electrons in September 2017 Space Weather Event" Space Weather. 21, e2023SW003651 https://doi.org/10.1029/2023SW003651

Numerical Prediction of Changes in Atmospheric Chemical Compositions During a Solar Energetic Particle Event on Mars

Published in Journal of Geophysical Research: Space Physics, 2023

This paper discusses the potential atmosphercic impact on Mars due to large solar energetic particle events, using PTRIP simulation.

Recommended citation: Nakamura, Y., Leblanc, F., Terada, N., Hiruba, S., Murata, I., Nakagawa, H., et al. (2023). "Numerical Prediction of Changes in Atmospheric Chemical Compositions During a Solar Energetic Particle Event on Mars" Journal of Geophysical Research: Space Physics. 128, e2022JA031250 https://doi.org/10.1029/2022JA031250

Direct Measurement of the Spectral Structure of Cosmic-Ray Electrons+Positrons in the TeV Region with CALET on the International Space Station

Published in Physical Review Letters, 2023

This paper shows the ISS-CALET measurement of TeV electrons and positrons.

Recommended citation: Adriani, O. et al. (CALET Collaboration) (2023). "Direct Measurement of the Spectral Structure of Cosmic-Ray Electrons+Positrons in the TeV Region with CALET on the International Space Station" Physical Review Letters. 131, 191001 https://doi.org/10.1103/PhysRevLett.131.191001

Machine learning emulator for physics-based prediction of ionospheric potential response to solar wind variations

Published in Earth, Planets and Space, 2023

This paper shows the details of the surrogate model for REPPU auroral Ionosphere version 1 (SMRAI1)

Recommended citation: Kataoka, R., S. Nakano, and S. Fujita (2023). "Machine learning emulator for physics-based prediction of ionospheric potential response to solar wind variations" Earth, Planets and Space. 75, 139 https://doi.org/10.1186/s40623-023-01896-3

A Ground-Based Instrument Suite for Integrated High-Time Resolution Measurements of Pulsating Aurora With Arase

Published in Journal of Geophysical Research: Space Physics, 2023

This paper explain the 100-fps all-sky camera observation.

Recommended citation: Hosokawa, K., Oyama, S.-I., Ogawa, Y., Miyoshi, Y., Kurita, S., Teramoto, M., et al. (2023). "A Ground-Based Instrument Suite for Integrated High-Time Resolution Measurements of Pulsating Aurora With Arase" Journal of Geophysical Research: Space Physics. 128, e2023JA031527 https://doi.org/10.1029/2023JA031527

Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station

Published in Physical Review Letters, 2023

This paper shows the CAELT GeV e+p measurement (GCR solar modulation) compared with a modeling work.

Recommended citation: Adriani, O. et al. (CALET Collaboration) (2023). "Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station" Physical Review Letters. 130, 211001 https://doi.org/10.1103/PhysRevLett.130.211001