Search Results - "K. Seki"

Effects of an Intrinsic Magnetic Field on Ion Loss From Ancient Mars Based on Multispecies MHD Simulations by Sakata, R., Seki, K., Sakai, S., Terada, N., Shinagawa, H., Tanaka, T.

“…Ion loss to space has played an important role in atmospheric escape and climate change on Mars because of intense solar activity during a younger, more active…”
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Pulsating aurora from electron scattering by chorus waves by Kasahara, S., Miyoshi, Y., Yokota, S., Mitani, T., Kasahara, Y., Matsuda, S., Kumamoto, A., Matsuoka, A., Kazama, Y., Frey, H. U., Angelopoulos, V., Kurita, S., Keika, K., Seki, K., Shinohara, I.

“…High-angular-resolution measurements allow the direct observation of the scattering of energetic electrons by chorus waves in the magnetosphere, which causes…”
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Effects of an Intrinsic Magnetic Field on Ion Escape From Ancient Mars Based on MAESTRO Multifluid MHD Simulations by Sakata, R., Seki, K., Terada, N., Sakai, S., Shinagawa, H.

“…Ion escape has played a key role in atmospheric loss on ancient Mars due to intense solar activity. Under the existence of a strong global intrinsic magnetic…”
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Excitonic insulator state in the two-orbital Hubbard model: Variational cluster approach by Kaneko, T., Seki, K., Ohta, Y.

“…The variational cluster approximation is used to study the spontaneous symmetry breaking of the excitonic insulator (EI) state in the two-orbital Hubbard model…”
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Multispecies MHD Study of Ion Escape at Ancient Mars: Effects of an Intrinsic Magnetic Field and Solar XUV Radiation by Sakata, R., Seki, K., Sakai, S., Terada, N., Shinagawa, H., Tanaka, T.

“…Ion escape is one of the key processes responsible for drastic climate change on ancient Mars. Ion escape is affected by the solar X‐ray and EUV (X‐ray and…”
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Study of Slow‐Mode Shock Formation and Particle Acceleration in the Symmetric Magnetic Reconnection Based on Hybrid Simulations by Walia, N. K., Seki, K., Amano, T.

“…The structure of the magnetic reconnection region and the acceleration mechanism of particles as they traverse from upstream into the reconnection exhaust are…”
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Characteristics of CME‐ and CIR‐Driven Ion Upflows in the Polar Ionosphere by Ogawa, Y., Seki, K., Keika, K., Ebihara, Y.

“…We investigated how velocity and flux of ionospheric ion upflows vary during magnetic storms driven by corotating interaction regions (CIRs) and coronal mass…”
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Three‐Dimensional Resistivity Structure of Iwo‐Yama Volcano, Kirishima Volcanic Complex, Japan: Relationship to Shallow Seismicity, Surface Uplift, and a Small Phreatic Eruption by Tsukamoto, K., Aizawa, K., Chiba, K., Kanda, W., Uyeshima, M., Koyama, T., Utsugi, M., Seki, K., Kishita, T.

“…Iwo‐yama volcano, part of the Kirishima Volcanic Complex, has recently shown signs of unrest. We conducted a hypocenter relocation of shallow earthquakes and…”
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The spatial distribution of planetary ion fluxes near Mars observed by MAVEN by Brain, D. A., McFadden, J. P., Halekas, J. S., Connerney, J. E. P., Bougher, S. W., Curry, S., Dong, C. F., Dong, Y., Eparvier, F., Fang, X., Fortier, K., Hara, T., Harada, Y., Jakosky, B. M., Lillis, R. J., Livi, R., Luhmann, J. G., Ma, Y., Modolo, R., Seki, K.

“…We present the results of an initial effort to statistically map the fluxes of planetary ions on a closed surface around Mars. Choosing a spherical shell ~1000…”
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Excitation of Two Types of Storm‐Time Pc5 ULF Waves by Ring Current Ions Based on the Magnetosphere‐Ionosphere Coupled Model by Yamakawa, T., Seki, K., Amano, T., Miyoshi, Y., Takahashi, N., Nakamizo, A., Yamamoto, K.

“…Two types of storm‐time Pc5 waves are excited in the magnetosphere–ionosphere coupled model. We conduct magnetosphere–ionosphere (M–I) coupling between…”
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Relativistic electron microbursts associated with whistler chorus rising tone elements: GEMSIS-RBW simulations by Saito, S., Miyoshi, Y., Seki, K.

“…Relativistic electron microbursts, which are bursty enhancements of the precipitation of relativistic electrons, are often observed by low‐altitude satellite…”
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Statistical Study of Heavy Ion Outflows From Mars Observed in the Martian‐Induced Magnetotail by MAVEN by Inui, S., Seki, K., Sakai, S., Brain, D.A., Hara, T., McFadden, J.P., Halekas, J.S., Mitchell, D.L., DiBraccio, G.A., Jakosky, B.M.

“…It is important to include the effects of cold ions when we consider heavy ion outflows from Mars. We here report on statistical properties of heavy ion…”
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Variation of Molecular Ions in the Inner Magnetosphere Observed by the Arase Satellite by Nagatani, A., Miyoshi, Y., Asamura, K., Kistler, L. M., Nakamura, S., Seki, K., Ogawa, Y., Shinohara, I.

“…We analyzed time‐of‐flight (TOF) data from the Arase satellite to investigate temporal variations of the molecular ion group (O2+, NO+, and N2+) at 19.2 keV/q…”
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Relation between fine structure of energy spectra for pulsating aurora electrons and frequency spectra of whistler mode chorus waves by Miyoshi, Y., Saito, S., Seki, K., Nishiyama, T., Kataoka, R., Asamura, K., Katoh, Y., Ebihara, Y., Sakanoi, T., Hirahara, M., Oyama, S., Kurita, S., Santolik, O.

“…We investigate the origin of the fine structure of the energy spectrum of precipitating electrons for the pulsating aurora (PsA) observed by the low‐altitude…”
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Syntheses and Characterization of Microporous Coordination Polymers with Open Frameworks by Seki, K, Mori, W

“…The reactions of porous two-dimensional copper dicarboxylates (copper fumarate, copper terephthalate, copper styrene dicarboxylate, and copper 4,4‘-biphenyl…”
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Low‐Altitude Ion Upflow Observed by EISCAT and its Effects on Supply of Molecular Ions in the Ring Current Detected by Arase (ERG) by Takada, M., Seki, K., Ogawa, Y., Keika, K., Kasahara, S., Yokota, S., Hori, T., Asamura, K., Miyoshi, Y., Shinohara, I.

“…During the magnetic storm starting on September 7, 2017, the MEP‐i instrument onboard the Arase (ERG) satellite observed molecular ions (O2+/NO+/N2+) in the…”
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Preferential Energization of Lower‐Charge‐State Heavier Ions in the Near‐Earth Magnetotail by Keika, K., Kasahara, S., Yokota, S., Hoshino, M., Seki, K., Amano, T., Kistler, L. M., Nosé, M., Miyoshi, Y., Hori, T., Shinohara, I.

“…O+ ions make a significant contribution to plasma pressure in the inner magnetosphere during magnetic storms. The storm‐time O+ enhancements are primarily…”
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Excitation of Storm Time Pc5 ULF Waves by Ring Current Ions Based on the Drift‐Kinetic Simulation by Yamakawa, T., Seki, K., Amano, T., Takahashi, N., Miyoshi, Y.

“…Storm time Pc5 waves are considered to be excited through the drift‐bounce resonance by ring current ions associated with the injection from the magnetotail…”
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Study of Atmospheric Ion Escape From Exoplanet TOI‐700 d: Venus Analogs by Nishioka, T., Seki, K., Sakata, R., Yamamoto, K., Terada, N., Sakai, S., Shinagawa, H., Nakayama, A.

“…TOI‐700 d is the first Earth‐sized planet in the habitable zone (HZ) discovered by the Transiting Exoplanet Survey Satellite. Here, we assess whether a…”
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A Statistical Study of the Solar Wind Dependence of Multi‐Harmonic Toroidal ULF Waves Observed by the Arase Satellite by Yamamoto, K., Seki, K., Matsuoka, A., Imajo, S., Teramoto, M., Kitahara, M., Kasahara, Y., Kumamoto, A., Tsuchiya, F., Shoji, M., Nakamura, S., Miyoshi, Y., Shinohara, I.

“…Toroidal standing Alfvén wave is one of the ultra‐low frequency waves that are frequently observed in the terrestrial magnetosphere. They sometimes exhibit…”
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