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研究成果 1996 2019

フィルター
記事
2019

Assessment of signal processing methods for geomagnetic precursor of the 2012 M6.9 Visayas, Philippines earthquake

Yusof, K. A., Abdul Hamid, N. S., Abdullah, M., Ahadi, S. & Yoshikawa, A., 1 1 2019, : : Acta Geophysica.

研究成果: ジャーナルへの寄稿記事

Philippines
signal processing
earthquakes
stations
diurnal variations

Investigation on the Variability of the Geomagnetic Daily Current During Sudden Stratospheric Warmings

Owolabi, C., Lei, J., Bolaji, O. S., Jimoh, O., Ruan, H., Li, N., Niu, X. & Yoshikawa, A., 1 1 2019, : : Journal of Geophysical Research: Space Physics. 124, 7, p. 6156-6172 17 p.

研究成果: ジャーナルへの寄稿記事

stratospheric warming
ionospheric currents
Upper atmosphere
electrojet
sectors

Longitudinal variability of the equatorial counter electrojet during the solar cycle 24

Soares, G., Yamazaki, Y., Matzka, J., Pinheiro, K., Stolle, C., Alken, P., Yoshikawa, A., Uozumi, T., Fujimoto, A. & Kulkarni, A., 4 1 2019, : : Studia Geophysica et Geodaetica. 63, 2, p. 304-319 16 p.

研究成果: ジャーナルへの寄稿記事

electrojets
electrojet
solar cycles
solar cycle
lunar phase

Magnetic Data Acquisition System (MAGDAS) Malaysia: installation and preliminary data analysis at ESERI, UNISZA

MAGDAS/CPMN Group, 5 1 2019, : : Indian Journal of Physics. 93, 5, p. 553-564 12 p.

研究成果: ジャーナルへの寄稿記事

Malaysia
data acquisition
installing
magnetometers
space weather
1 引用 (Scopus)

Modeling Geomagnetically Induced Currents in Australian Power Networks Using Different Conductivity Models

Marshall, R. A., Wang, L., Paskos, G. A., Olivares-Pulido, G., Van Der Walt, T., Ong, C., Mikkelsen, D., Hesse, G., McMahon, B., Van Wyk, E., Ivanovich, G., Spoor, D., Taylor, C. & Yoshikawa, A., 1 1 2019, : : Space Weather.

研究成果: ジャーナルへの寄稿記事

conductivity
modeling
geoelectric field
Australian Region
geomagnetic storm

Response of Ionospheric Profile Parameters to Equatorial Electrojet Over Peruvian Station

Bello, S. A., Abdullah, M., Hamid, N. S. A., Reinisch, B. W., Yoshikawa, A. & Fujimoto, A., 4 1 2019, : : Earth and Space Science. 6, 4, p. 617-628 12 p.

研究成果: ジャーナルへの寄稿記事

公開
electrojet
electron density
solar activity
station
parameter

Response of the Ionosphere-Plasmasphere Coupling to the September 2017 Storm: What Erodes the Plasmasphere so Severely?

Obana, Y., Maruyama, N., Shinbori, A., Hashimoto, K. K., Fedrizzi, M., Nosé, M., Otsuka, Y., Nishitani, N., Hori, T., Kumamoto, A., Tsuchiya, F., Matsuda, S., Matsuoka, A., Kasahara, Y., Yoshikawa, A., Miyoshi, Y. & Shinohara, I., 6 1 2019, : : Space Weather. 17, 6, p. 861-876 16 p.

研究成果: ジャーナルへの寄稿記事

electron density
ionosphere
erosion
electric field
penetration

Statistical Study of Selective Oxygen Increase in High-Energy Ring Current Ions During Magnetic Storms

Mitani, K., Seki, K., Keika, K., Gkioulidou, M., Lanzerotti, L. J., Mitchell, D. G., Kletzing, C. A., Yoshikawa, A. & Obana, Y., 5 1 2019, : : Journal of Geophysical Research: Space Physics. 124, 5, p. 3193-3209 17 p.

研究成果: ジャーナルへの寄稿記事

ring currents
current ring
magnetic storms
Ions
ions
2018
1 引用 (Scopus)

Application of solar quiet (Sq) current in determining mantle conductivity-depth structure in Malaysia

Abidin, Z. Z., Jusoh, M. H., Abbas, M. & Yoshikawa, A., 1 1 2018, (受理済み/印刷中) : : Journal of Atmospheric and Solar-Terrestrial Physics.

研究成果: ジャーナルへの寄稿記事

Malaysia
Earth mantle
conductivity
mantle
profiles

Features of the inter-hemispheric field-aligned current system over Malaysia ionosphere

Abidin, Z. Z., Jusoh, M. H., Abbas, M., Bolaji, O. S. & Yoshikawa, A., 1 1 2018, (受理済み/印刷中) : : Journal of Atmospheric and Solar-Terrestrial Physics.

研究成果: ジャーナルへの寄稿記事

Malaysia
field aligned currents
ionospheres
ionosphere
arcs

Generation of Electron Acoustic Waves in the Topside Ionosphere From Coupling With Kinetic Alfven Waves: A New Electron Energization Mechanism

Shi, R., Ni, B., Summers, D., Liu, H., Yoshikawa, A. & Zhang, B., 6 16 2018, : : Geophysical Research Letters. 45, 11, p. 5299-5304 6 p.

研究成果: ジャーナルへの寄稿記事

acoustic wave
magnetohydrodynamic waves
ionospheres
ionosphere
electron

Global Distribution of ULF Waves During Magnetic Storms: Comparison of Arase, Ground Observations, and BATSRUS + CRCM Simulation

Takahashi, N., Seki, K., Teramoto, M., Fok, M. C., Zheng, Y., Matsuoka, A., Higashio, N., Shiokawa, K., Baishev, D., Yoshikawa, A. & Nagatsuma, T., 9 28 2018, : : Geophysical Research Letters. 45, 18, p. 9390-9397 8 p.

研究成果: ジャーナルへの寄稿記事

extremely low frequencies
magnetic storms
simulation
electron
wave power
1 引用 (Scopus)

Investigation of Unusual Solar Flare Effect on the Global Ionospheric Current System

Annadurai, N. M. N., Hamid, N. S. A., Yamazaki, Y. & Yoshikawa, A., 10 1 2018, : : Journal of Geophysical Research: Space Physics. 123, 10, p. 8599-8609 11 p.

研究成果: ジャーナルへの寄稿記事

D region
ionospheric currents
Harmonic analysis
solar flares
electrojet
1 引用 (Scopus)

Longitudinal Development of Poleward Boundary Intensifications (PBIs) of Auroral Emission

Ohtani, S., Motoba, T., Gjerloev, J. W., Ruohoniemi, J. M., Donovan, E. F. & Yoshikawa, A., 11 1 2018, : : Journal of Geophysical Research: Space Physics. 123, 11, p. 9005-9021 17 p.

研究成果: ジャーナルへの寄稿記事

polar caps
convection
ionospherics
field aligned currents
Channel flow
1 引用 (Scopus)

Pemerhatian Arus Ionosfera semasa Suar Suria Kuat Menggunakan Data Magnetometer Dasar

Annadurai, N. M. N., Hamid, N. S. A. & Yoshikawa, A., 3 1 2018, : : Sains Malaysiana. 47, 3, p. 595-601 7 p.

研究成果: ジャーナルへの寄稿記事

Magnetometers
Ionosphere
Sun
Data acquisition
Earth (planet)

Perubahan Sistem Arus Ionosfera di Kawasan Asia Tenggara semasa Ribut Geomagnet pada Fasa Suria Minimum

Hamid, N. S. A., Wen, V. A., Rosli, N. I. M. & Yoshikawa, A., 8 1 2018, : : Sains Malaysiana. 47, 8, p. 1923-1929 7 p.

研究成果: ジャーナルへの寄稿記事

geomagnetic storm
electrojet
Southern Hemisphere
coronal mass ejection
magnetometer
3 引用 (Scopus)

Theory, modeling, and integrated studies in the Arase (ERG) project

Seki, K., Miyoshi, Y., Ebihara, Y., Katoh, Y., Amano, T., Saito, S., Shoji, M., Nakamizo, A., Keika, K., Hori, T., Nakano, S. Y., Watanabe, S., Kamiya, K., Takahashi, N., Omura, Y., Nose, M., Fok, M. C., Tanaka, T., Ieda, A. & Yoshikawa, A., 12 1 2018, : : earth, planets and space. 70, 1, 17.

研究成果: ジャーナルへの寄稿記事

radiation
modeling
simulation
electron
radial diffusion
2017

Analysis of Magnetic Field Variations Produced by Equatorial Electro-Jets

López, E., Aldás, F. & Yoshikawa, A., 1 1 2017, : : Proceedings of the International Astronomical Union. 13, S335, p. 125-127 3 p.

研究成果: ジャーナルへの寄稿記事

equatorial electrojet
electrojet
magnetic field
electron
daytime
2 引用 (Scopus)

Application of a global magnetospheric-ionospheric current model for dayside and terminator Pi2 pulsations

Imajo, S., Yoshikawa, A., Uozumi, T., Ohtani, S., Nakamizo, A. & Chi, P. J., 8 1 2017, : : Journal of Geophysical Research: Space Physics. 122, 8, p. 8589-8603 15 p.

研究成果: ジャーナルへの寄稿記事

ionospheric currents
magnetic fields
oscillation
Magnetic fields
electric field
3 引用 (Scopus)

Contribution of storm time substorms to the prompt electric field disturbances in the equatorial ionosphere

Hui, D., Chakrabarty, D., Sekar, R., Reeves, G. D., Yoshikawa, A. & Shiokawa, K., 5 1 2017, : : Journal of Geophysical Research: Space Physics. 122, 5, p. 5568-5578 11 p.

研究成果: ジャーナルへの寄稿記事

Ionosphere
electric field
ionospheres
ionosphere
disturbances
2 引用 (Scopus)

First geomagnetic observation at sabah, malaysia by using MAGDAS array

Ibrahim, S. N., Jusoh, M. H., Sulaiman, A. A., Ahmad, S. N. A., Makmud, M. Z. H., Musta, B., Abdullah, M., Asillam, M. F., Pathy, N. B., Hashim, M. H. & Yoshikawa, A., 1 1 2017, : : International Journal of Simulation: Systems, Science and Technology. 17, 41, p. 30.1-30.8

研究成果: ジャーナルへの寄稿記事

Malaysia
Magnetometers
Data Acquisition
Data acquisition
Longitude
4 引用 (Scopus)

High-latitude Pi2 pulsations associated with kink-like neutral sheet oscillations

Wang, G. Q., Volwerk, M., Zhang, T. L., Schmid, D. & Yoshikawa, A., 3 1 2017, : : Journal of Geophysical Research: Space Physics. 122, 3, p. 2889-2899 11 p.

研究成果: ジャーナルへの寄稿記事

neutral sheets
field aligned currents
polar regions
oscillation
oscillations
2 引用 (Scopus)

Latitudinal variation of ionospheric currents in Southeast Asian sector

Hamid, N. S. A., Ismail, W. N. I. & Yoshikawa, A., 2 1 2017, : : Advanced Science Letters. 23, 2, p. 1444-1447 4 p.

研究成果: ジャーナルへの寄稿記事

Solar Activity
electrojet
Sector
Networks (circuits)
Equator
3 引用 (Scopus)

Longitudinal profile of the equatorial electrojet current and its dependence on solar activity

Hamid, N. S. A., Ismail, W. N. I. & Yoshikawa, A., 2 1 2017, : : Advanced Science Letters. 23, 2, p. 1357-1360 4 p.

研究成果: ジャーナルへの寄稿記事

Solar Activity
electrojet
Magnetometers
solar activity
magnetometer
12 引用 (Scopus)

Longitudinal variation of equatorial electrojet and the occurrence of its counter electrojet

Babatunde Rabiu, A., Folarin, O. O., Uozumi, T., Hamid, N. S. A. & Yoshikawa, A., 4 7 2017, : : Annales Geophysicae. 35, 3, p. 535-545 11 p.

研究成果: ジャーナルへの寄稿記事

equatorial electrojet
electrojets
electrojet
counters
occurrences
3 引用 (Scopus)

Meridional movement of northern and southern equatorial ionization anomaly crests in the East-Asian sector during 2002–2003 SSW

Mo, X. H., Zhang, D. H., Goncharenko, L. P., Zhang, S. R., Hao, Y. Q., Xiao, Z., Pei, J. Z., Yoshikawa, A. & Chau, H. D., 4 1 2017, : : Science China Earth Sciences. 60, 4, p. 776-785 10 p.

研究成果: ジャーナルへの寄稿記事

ionization
anomaly
electrojet
Southern Hemisphere
asymmetry
5 引用 (Scopus)

Modeling geomagnetic induced currents in Australian power networks

Marshall, R. A., Kelly, A., Van Der Walt, T., Honecker, A., Ong, C., Mikkelsen, D., Spierings, A., Ivanovich, G. & Yoshikawa, A., 7 1 2017, : : Space Weather. 15, 7, p. 895-916 22 p.

研究成果: ジャーナルへの寄稿記事

geomagnetic storm
modeling
geoelectric field
solar cycle
magnetic field
3 引用 (Scopus)

Nighttime Pc3 pulsations: MM100 and MAGDAS observations

Yagova, N. V., Heilig, B., Pilipenko, V. A., Yoshikawa, A., Nosikova, N. S., Yumoto, K. & Reda, J., 12 1 2017, : : earth, planets and space. 69, 1, 61.

研究成果: ジャーナルへの寄稿記事

morning
night
solar wind
solar wind velocity
geomagnetic latitude
8 引用 (Scopus)

Variations of B0 and B1 with the solar quiet Sq-current system and comparison with IRI-2012 model at Ilorin

Bello, S. A., Abdullah, M., Hamid, N. S. A., Yoshikawa, A. & Olawepo, A. O., 7 15 2017, : : Advances in Space Research. 60, 2, p. 307-316 10 p.

研究成果: ジャーナルへの寄稿記事

Ionosphere
ionospheres
ionosphere
daytime
correlation coefficients
2016
5 引用 (Scopus)

Evolution of the current system during solar wind pressure pulses based on aurora and magnetometer observations

Nishimura, Y., Kikuchi, T., Ebihara, Y., Yoshikawa, A., Imajo, S., Li, W. & Utada, H., 12 1 2016, : : earth, planets and space. 68, 1, 144.

研究成果: ジャーナルへの寄稿記事

wind pressure
pressure pulses
aurora
magnetometer
magnetometers
1 引用 (Scopus)

Initial deflection of middle-latitude Pi2 pulsations in the premidnight sector: Remote detection of oscillatory upward field-aligned current at substorm onset

Uozumi, T., Yoshikawa, A., Ohtani, S., Imajo, S., Baishev, D. G., Moiseev, A. V. & Yumoto, K., 7 1 2016, : : Journal of Geophysical Research: Space Physics. 121, 7, p. 6324-6340 17 p.

研究成果: ジャーナルへの寄稿記事

field aligned currents
deflection
sectors
wedges
Polarization
6 引用 (Scopus)

Propagation of ULF waves from the upstream region to the midnight sector of the inner magnetosphere

Takahashi, K., Hartinger, M. D., Malaspina, D. M., Smith, C. W., Koga, K., Singer, H. J., Frühauff, D., Baishev, D. G., Moiseev, A. V. & Yoshikawa, A., 9 1 2016, : : Journal of Geophysical Research A: Space Physics. 121, 9, p. 8428-8447 20 p.

研究成果: ジャーナルへの寄稿記事

Magnetosphere
extremely low frequencies
magnetospheres
upstream
magnetosphere
7 引用 (Scopus)

Solar quiet current response in the African sector due to a 2009 sudden stratospheric warming event

Bolaji, O. S., Oyeyemi, E. O., Owolabi, O. P., Yamazaki, Y., Rabiu, A. B., Okoh, D., Fujimoto, A., Amory-Mazaudier, C., Seemala, G. K., Yoshikawa, A. & Onanuga, O. K., 8 1 2016, : : Journal of Geophysical Research: Space Physics. 121, 8, p. 8055-8065 11 p.

研究成果: ジャーナルへの寄稿記事

stratospheric warming
Upper atmosphere
electrojet
equatorial electrojet
electrojets
3 引用 (Scopus)

Solar terminator effects on middle- to low-latitude Pi2 pulsations

Imajo, S., Yoshikawa, A., Uozumi, T., Ohtani, S., Nakamizo, A., Demberel, S. & Shevtsov, B. M., 12 1 2016, : : earth, planets and space. 68, 1, 137.

研究成果: ジャーナルへの寄稿記事

tropical regions
sunrise
field aligned currents
sunset
ionospheric currents
5 引用 (Scopus)
field aligned currents
polar caps
ionospherics
Channel flow
polarization

The prolonged southward IMF-Bz event of 2–4 May 1998: Solar, interplanetary causes and geomagnetic consequences

Bisoi, S. K., Chakrabarty, D., Janardhan, P., Rastogi, R. G., Yoshikawa, A., Fujiki, K., Tokumaru, M. & Yan, Y., 5 1 2016, : : Journal of Geophysical Research A: Space Physics. 121, 5, p. 3882-3904 23 p.

研究成果: ジャーナルへの寄稿記事

coronal mass ejection
IMF
current sheets
magnetic fields
Magnetic fields
2015
4 引用 (Scopus)

Anomalous ULF emissions and their possible association with the strong earthquakes in sumatra, Indonesia, during 2007-2012

Ahadi, S., Puspito, N. T., Ibrahim, G., Saroso, S., Yumoto, K., Yoshikawa, A. & Muzli, L., 1 1 2015, : : Journal of Mathematical and Fundamental Sciences. 47, 1, p. 84-103 20 p.

研究成果: ジャーナルへの寄稿記事

Indonesia
Earthquakes
earthquakes
Earthquake
Anomalous
1 引用 (Scopus)

Capacity building: A tool for advancing space weather science

Cardinal, M. G., Yoshikawa, A., Kawano, H., Liu, H., Watanabe, M., Abe, S., Uozumi, T., Maeda, G., Hada, T. & Yumoto, K., 1 1 2015, : : Space Weather. 12, 10, p. 571-576 6 p.

研究成果: ジャーナルへの寄稿記事

capacity building
weather
science
2 引用 (Scopus)

Eastward-expanding auroral surges observed in the post-midnight sector during a multiple-onset substorm

Tanaka, Y., Ogawa, Y., Kadokura, A., Partamies, N., Whiter, D., Enell, C. F., Brändström, U., Sergienko, T., Gustavsson, B., Kozlovsky, A., Miyaoka, H. & Yoshikawa, A., 12 1 2015, : : earth, planets and space. 67, 1, 182.

研究成果: ジャーナルへの寄稿記事

sectors
aurora
current direction
recurrence interval
magnetometer
10 引用 (Scopus)

Empirical model of equatorial electrojet based on ground-based magnetometer data during solar minimum in fall 3. Space science

Hamid, N. S. A., Liu, H., Uozumi, T. & Yoshikawa, A., 12 1 2015, : : earth, planets and space. 67, 1, 205.

研究成果: ジャーナルへの寄稿記事

equatorial electrojet
electrojet
aerospace sciences
magnetometer
magnetometers

Generation of different long-period geomagnetic pulsations during a sudden impulse

Moiseyev, A. V., Popov, V. I., Mullayarov, V. A., Samsonov, S. N., Du, A. & Yoshikawa, A., 7 25 2015, : : Cosmic Research. 53, 4, p. 257-266 10 p.

研究成果: ジャーナルへの寄稿記事

geomagnetic pulsations
Magnetosphere
Solar wind
impulses
oscillation
11 引用 (Scopus)

Near-equatorial Pi2 and Pc3 waves observed by CHAMP and on SAMBA/MAGDAS stations

Cuturrufo, F., Pilipenko, V., Heilig, B., Stepanova, M., Lühr, H., Vega, P. & Yoshikawa, A., 2 15 2015, : : Advances in Space Research. 55, 4, p. 1180-1189 10 p.

研究成果: ジャーナルへの寄稿記事

CHAMP
stations
Ionosphere
ionosphere
daytime
12 引用 (Scopus)

NmF2 and hmF2 measurements at 95° e and 127° e around the EIA northern crest during 2010-2014

Kalita, B. R., Bhuyan, P. K. & Yoshikawa, A., 12 1 2015, : : earth, planets and space. 67, 1, 67.

研究成果: ジャーナルへの寄稿記事

solar activity
anomalies
anomaly
equatorial electrojet
electrojet
5 引用 (Scopus)

Pi2 pulsations observed around the dawn terminator

Imajo, S., Yoshikawa, A., Uozumi, T., Ohtani, S., Nakamizo, A., Marshall, R., Shevtsov, B. M., Akulichev, V. A., Sukhbaatar, U., Liedloff, A. & Yumoto, K., 3 1 2015, : : Journal of Geophysical Research A: Space Physics. 120, 3, p. 2088-2098 11 p.

研究成果: ジャーナルへの寄稿記事

E region
oscillation
Statistical methods
Polarization
oscillations
4 引用 (Scopus)

Spatial variability of solar quiet fields along 96° magnetic meridian in Africa: Results from MAGDAS

Bolaji, O. S., Rabiu, A. B., Bello, O. R., Yoshikawa, A., Yumoto, K., Odeyemi, O. O. & Ogunmodimu, O., 5 1 2015, : : Journal of Geophysical Research: Space Physics. 120, 5, p. 3883-3898 16 p.

研究成果: ジャーナルへの寄稿記事

Upper atmosphere
noon
stratospheric warming
data acquisition
magnetic equator

The 2011 eruption of Aso volcano, Japan, and its signature on the geomagnetic field measurements

Takla, E. M., Odah, H., Abd Elaal, E. M., Yoshikawa, A., Kawano, H. & Uozumi, T., 10 30 2015, : : Arabian Journal of Geosciences. 8, 10, p. 8497-8503 7 p.

研究成果: ジャーナルへの寄稿記事

geomagnetic field
volcano
volcanic eruption
diurnal variation
station
2014
13 引用 (Scopus)

A case study of ionospheric storm effects during long-lasting southward IMF Bz-driven geomagnetic storm

Liu, J., Liu, L., Nakamura, T., Zhao, B., Ning, B. & Yoshikawa, A., 1 1 2014, : : Journal of Geophysical Research: Space Physics. 119, 9, p. 7716-7731 16 p.

研究成果: ジャーナルへの寄稿記事

ionospheric storms
geomagnetic storm
interplanetary magnetic fields
magnetic storms
electric field
2 引用 (Scopus)

Analysis of propagation delays of compressional Pi 2 waves between geosynchronous altitude and low latitudes

Imajo, S., Yumoto, K., Uozumi, T., Kawano, H., Abe, S., Ikeda, A., Koga, K., Matsumoto, H., Obara, T., Marshall, R., Akulichev, V. A., Mahrous, A., Liedloff, A. & Yoshikawa, A., 1 1 2014, : : earth, planets and space. 66, 1, 20.

研究成果: ジャーナルへの寄稿記事

公開
tropical regions
propagation
time lag
ground stations
magnetospheres
5 引用 (Scopus)

Approximate forms of daytime ionospheric conductance

Ieda, A., Oyama, S., Vanhamaki, H. A., Fujii, R., Nakamizo, A., Amm, O., Hori, T., Takeda, M., Ueno, G., Yoshikawa, A., Redmon, R. J., Denig, W. F., Kamide, Y. & Nishitani, N., 1 1 2014, : : Journal of Geophysical Research: Space Physics. 119, 12, p. 10397-10415 19 p.

研究成果: ジャーナルへの寄稿記事

Plasma sources
zenith angle
daytime
ionospherics
Electric conductance

Data processing method to classify Pc5 ULF pulsations due to solar wind perturbations at equatorial region

Ahmad, S. N. A., Jusoh, M. H., Shariff, K. K. M., Abdullah, M., Asillam, M. F., Veenadhari, B., Uozumi, T., Abe, S., Yoshikawa, A. & Cardinal, M. G., 2014, : : WSEAS Transactions on Signal Processing. 10, 1, p. 337-344 8 p.

研究成果: ジャーナルへの寄稿記事

Solar wind
Magnetometers
Sampling
Processing