Search Results - "Tsuda, Takuo T."

An automated auroral detection system using deep learning: real-time operation in Tromsø, Norway by Nanjo, Sota, Nozawa, Satonori, Yamamoto, Masaki, Kawabata, Tetsuya, Johnsen, Magnar G., Tsuda, Takuo T., Hosokawa, Keisuke

“…The activity of citizen scientists who capture images of aurora borealis using digital cameras has recently been contributing to research regarding space…”
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A statistical study of convective and dynamic instabilities in the polar upper mesosphere above Tromsø by Nozawa, Satonori, Saito, Norihito, Kawahara, Takuya, Wada, Satoshi, Tsuda, Takuo T., Maeda, Sakiho, Takahashi, Toru, Fujiwara, Hitoshi, Narayanan, Viswanathan Lakshmi, Kawabata, Tetsuya, Johnsen, Magnar G.

“…We have studied the convective (or static) and dynamic instabilities between 80 and 100 km above Tromsø (69.6° N, 19.2° E) using temperature and wind data of…”
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Observation of Synchronization Between Instabilities of the Sporadic E Layer and Geomagnetic Field Line Connected F Region Medium‐Scale Traveling Ionospheric Disturbances by Ejiri, Mitsumu K., Nakamura, Takuji, Tsuda, Takuo T., Nishiyama, Takanori, Abo, Makoto, She, Chiao‐Yao, Nishioka, Michi, Saito, Akinori, Takahashi, Toru, Tsuno, Katsuhiko, Kawahara, Takuya D., Ogawa, Takayo, Wada, Satoshi

“…A frequency‐tunable resonance scattering lidar with high temporal/vertical resolutions (1 min/15 m) observed sporadic calcium ion (Ca+s) layers at ~100 km over…”
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Thermospheric wind response to a sudden ionospheric variation in the trough: event at a pseudo-breakup during geomagnetically quiet conditions by Oyama, Shin-ichiro, Vanhamäki, Heikki, Cai, Lei, Aikio, Anita, Rietveld, Michael, Ogawa, Yasunobu, Raita, Tero, Kellinsalmi, Mirjam, Kauristie, Kirsti, Kozelov, Boris, Shinbori, Atsuki, Shiokawa, Kazuo, Tsuda, Takuo T., Sakanoi, Takeshi

“…The thermospheric wind response to a sudden westward turning of the ion velocity at a high latitude was studied by analyzing data obtained with a Fabry–Perot…”
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Lower thermospheric wind variations in auroral patches during the substorm recovery phase by Oyama, Shin‐ichiro, Shiokawa, Kazuo, Miyoshi, Yoshizumi, Hosokawa, Keisuke, Watkins, Brenton J., Kurihara, Junichi, Tsuda, Takuo T., Fallen, Christopher T.

“…Measurements of the lower thermospheric wind with a Fabry‐Perot interferometer (FPI) at Tromsø, Norway, found the largest wind variations in a night during the…”
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Simultaneous FPI and TMA Measurements of the Lower Thermospheric Wind in the Vicinity of the Poleward Expanding Aurora After Substorm Onset by Oyama, Shin‐ichiro, Kubota, Ken, Morinaga, Takatoshi, Tsuda, Takuo T., Kurihara, Junichi, Larsen, Miguel F., Yamamoto, Masayuki, Cai, Lei

“…Lower thermospheric wind fluctuations in the vicinity of an auroral arc immediately before and after a substorm onset were examined by analyzing data from a…”
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Vertical fine structure and time evolution of plasma irregularities in the E s layer observed by a high-resolution Ca+ lidar by Ejiri, Mitsumu K, Nakamura, Takuji, Tsuda, Takuo T, Nishiyama, Takanori, Abo, Makoto, Takahashi, Toru, Tsuno, Katsuhiko, Kawahara, Takuya D, Ogawa, Takayo, Wada, Satoshi

“…The vertical fine structures and the time evolution of plasma irregularities in the sporadic E (Es) layer were observed via calcium ion (Ca+) density…”
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Height and time characteristics of seasonal and diurnal variations in PMWE based on 1 year observations by the PANSY radar (69.0°S, 39.6°E) by Nishiyama, Takanori, Sato, Kaoru, Nakamura, Takuji, Tsutsumi, Masaki, Sato, Toru, Kohma, Masashi, Nishimura, Koji, Tomikawa, Yoshihiro, Ejiri, Mitsumu K., Tsuda, Takuo T.

“…We report height and time variations in polar mesosphere winter echoes (PMWE) based on the Program of the Antarctic Syowa…”
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Initial report on polar mesospheric cloud observations by Himawari-8 by Tsuda, Takuo T., Hozumi, Yuta, Kawaura, Kento, Hosokawa, Keisuke, Suzuki, Hidehiko, Nakamura, Takuji

“…We provide an initial report on polar mesospheric cloud (PMC) observations by the Japanese Geostationary Earth Orbit (GEO) meteorological satellite Himawari-8…”
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Capability of airline jets as an observation platform for noctilucent clouds at middle latitudes by Suzuki, Hidehiko, Matsumoto, Ayako, Dalin, Peter, Nakamura, Yuriko, Ishii, Satoshi, Sakanoi, Kazuyo, Sakaguchi, Kaori, Takada, Taku, Tsuda, Takuo T., Hozumi, Yuta

“…The exact occurrence frequency of noctilucent clouds (NLCs) in middle latitudes is significant information because it is thought to be sensitive to long-term…”
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Auroral molecular-emission effects on the atomic oxygen line at 777.4 nm by Oyama, Shin-ichiro, Tsuda, Takuo T., Hosokawa, Keisuke, Ogawa, Yasunobu, Miyoshi, Yoshizumi, Kurita, Satoshi, Kero, Antti E., Fujii, Ryoichi, Tanaka, Yoshimasa, Mizuno, Akira, Kawabata, Tetsuya, Gustavsson, Björn, Leyser, Thomas

“…One of the representative auroral emission lines that radiates from F-region heights and is measurable on the ground is the 777.4 nm line from excited atomic…”
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The first simultaneous spectroscopic and monochromatic imaging observations of short-wavelength infrared aurora of N2+ Meinel (0,0) band at 1.1 μm with incoherent scatter radar by Nishiyama, Takanori, Kagitani, Masato, Furutachi, Senri, Iwasa, Yuki, Ogawa, Yasunobu, Tsuda, Takuo T., Dalin, Peter, Tsuchiya, Fuminori, Nozawa, Satonori, Sigernes, Fred

“…This study presents a first simultaneous observation of N 2 +  Meinel (0,0) band (hereafter, N 2 +  (M)) aurora by cutting-edge short-wavelength infrared…”
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Exceptionally gigantic aurora in the polar cap on a day when the solar wind almost disappeared by Hosokawa, Keisuke, Kataoka, Ryuho, Tsuda, Takuo T, Ogawa, Yasunobu, Taguchi, Satoshi, Zhang, Yongliang, Paxton, Larry J

“…Revealing the origins of aurorae in Earth's polar cap has long been a challenge since direct precipitation of energetic electrons from the magnetosphere is not…”
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Rayleigh/Raman lidar observations of gravity wave activity from 15 to 70 km altitude over Syowa (69°S, 40°E), the Antarctic by Kogure, Masaru, Nakamura, Takuji, Ejiri, Mitsumu K., Nishiyama, Takanori, Tomikawa, Yoshihiro, Tsutsumi, Masaki, Suzuki, Hidehiko, Tsuda, Takuo T., Kawahara, Takuya D., Abo, Makoto

“…The potential energy of gravity waves (GWs) per unit mass (Ep), at altitudes of 15–70 km, has been examined from temperature profiles obtained by a…”
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Horizontal Movement of Polar Mesospheric Clouds Observed From the Himawari‐8 Geostationary Meteorological Satellite by Hozumi, Yuta, Tsuda, Takuo T., Hosokawa, Keisuke, Ando, Yoshiaki, Suzuki, Hidehiko, Murata, Takeshi, Nakamura, Takuji

“…The horizontal movement of polar mesospheric clouds (PMCs) is examined with data from Geostationary‐Earth‐Orbit (GEO) meteorological satellite Himawari‐8 using…”
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Vertical fine structure and time evolution of plasma irregularities in the Es layer observed by a high-resolution Ca+ lidar by Ejiri, Mitsumu K., Nakamura, Takuji, Tsuda, Takuo T., Nishiyama, Takanori, Abo, Makoto, Takahashi, Toru, Tsuno, Katsuhiko, Kawahara, Takuya D., Ogawa, Takayo, Wada, Satoshi

“…The vertical fine structures and the time evolution of plasma irregularities in the sporadic E ( E s ) layer were observed via calcium ion (Ca + ) density…”
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Layered conductance in the ionosphere estimated using data from a multiwavelength photometer at the European Incoherent Scatter radar site by Shin-ichiro Oyama, Taiki Watanabe, Ryoichi Fujii, Satonori Nozawa, Takuo T. Tsuda

“…This study aimed to develop a methodology for estimating ionospheric conductance at auroral latitudes using data from a multi-wavelength photometer (427.8,…”
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The first simultaneous spectroscopic and monochromatic imaging observations of short-wavelength infrared aurora of [Formula omitted] Meinel by Nishiyama, Takanori, Kagitani, Masato, Furutachi, Senri, Iwasa, Yuki, Ogawa, Yasunobu, Tsuda, Takuo T, Dalin, Peter

“…This study presents a first simultaneous observation of [Formula omitted] Meinel (0,0) band (hereafter, [Formula omitted] (M)) aurora by cutting-edge…”
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The first simultaneous spectroscopic and monochromatic imaging observations of short-wavelength infrared aurora of [Formula omitted] Meinel band at 1.1 [Formula omitted]m with incoherent scatter radar by Nishiyama, Takanori, Kagitani, Masato, Furutachi, Senri, Iwasa, Yuki, Ogawa, Yasunobu, Tsuda, Takuo T, Dalin, Peter, Tsuchiya, Fuminori, Nozawa, Satonori, Sigernes, Fred

“…This study presents a first simultaneous observation of [Formula omitted] Meinel (0,0) band (hereafter, [Formula omitted] (M)) aurora by cutting-edge…”
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The first simultaneous spectroscopic and monochromatic imaging observations of short-wavelength infrared aurora of $$\mathrm {N_{2}^{+}}$$ Meinel (0,0) band at 1.1 $$\mathrm {\mu }$$m with incoherent scatter radar by Nishiyama, Takanori, Kagitani, Masato, Furutachi, Senri, Iwasa, Yuki, Ogawa, Yasunobu, Tsuda, Takuo T., Dalin, Peter, Tsuchiya, Fuminori, Nozawa, Satonori, Sigernes, Fred

“…This study presents a first simultaneous observation of $$\mathrm {N_{2}^{+}}$$ N 2 +  Meinel (0,0) band (hereafter, $$\mathrm {N_{2}^{+}}$$ N 2 +  (M)) aurora…”
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