Researcher Database

Tetsuro Ishida
Faculty of Science
Specially Appointed Assistant Professor

Researcher Profile and Settings

Alias Name

    Tetsuro Ishida

Affiliation

  • Faculty of Science

Job Title

  • Specially Appointed Assistant Professor

Degree

  • Pd.D.(SOKENDAI)

Research funding number

  • 50761607

J-Global ID

Research Interests

  • Remote Sensing   Microsatellite   Ionosphere   Upper atmosphere   

Research Areas

  • Natural sciences / Space and planetary science

Association Memberships

  • THE REMOTE SENSING SOCIETY OF JAPAN   SOCIETY OF GEOMAGNETISM AND EARTH, PLANETARY AND SPACE SCIENCES   

Research Activities

Published Papers

  • Nagatsuma, T, A. Kumamoto, M. Ozaki, K. Kitamura, Y. Saito, T. Takashima, M. Nose, J. Kurihara, H. Kojima, K. Ishisaka, A. Matsuoka, R. Nomura, T. Ishida, Y. Takahashi
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 16 687 - 690 2018/11 [Refereed][Not invited]
  • Tetsuro Ishida, Junichi Kurihara, Fra Angelico Viray, Shielo Baes Namuco, Enrico C. Paringit, Gay Jane Perez, Yukihiro Takahashi, Joel Joseph Marciano
    Computers and Electronics in Agriculture 144 80 - 85 0168-1699 2018/01/01 [Refereed][Not invited]
     
    The use of unmanned aerial vehicle (UAV)-based spectral imaging offers considerable advantages in high-resolution remote-sensing applications. However, the number of sensors mountable on a UAV is limited, and selecting the optimal combination of spectral bands is complex but crucial for conventional UAV-based multispectral imaging systems. To overcome these limitations, we adopted a liquid crystal tunable filter (LCTF), which can transmit selected wavelengths without the need to exchange optical filters. For calibration and validation of the LCTF-based hyperspectral imaging system, a field campaign was conducted in the Philippines during March 28–April 3, 2016. In this campaign, UAV-based hyperspectral imaging was performed in several vegetated areas, and the spectral reflectances of 14 different ground objects were measured. Additionally, the machine learning (ML) approach using a support vector machine (SVM) model was applied to the obtained dataset, and a high-resolution classification map was then produced from the aerial hyperspectral images. The results clearly showed that a large amount of misclassification occurred in shaded areas due to the difference in spectral reflectance between sunlit and shaded areas. It was also found that the classification accuracy was drastically improved by training the SVM model with both sunlit and shaded spectral data. As a result, we achieved a classification accuracy of 94.5% in vegetated areas.
  • T. Ishida, Y. Ogawa, A. Kadokura, K. Hosokawa, Y. Otsuka
    ANNALES GEOPHYSICAE 33 (5) 525 - 530 0992-7689 2015 [Refereed][Not invited]
     
    Ionospheric blobs are localized plasma density enhancements, which are mainly produced by the transportation process of plasma. To understand the deformation process of a blob, observations of plasma parameters with good spatial-temporal resolution are desirable. Thus, we conducted the European Incoherent Scatter radar observations with high-speed meridional scans (60-80 s) during October and December 2013, and observed the temporal evolution of a blob during a substorm on 4 December 2013. This paper is the first report of direct observations of blob deformation during a substorm. The blob deformation arose from an enhanced plasma flow shear during the substorm expansion phase, and then the blob split into two smaller-scale blobs, whose scale sizes were more than similar to 100 km in latitude. Our analysis indicates that the Kelvin-Helmholtz instability and dissociative recombination could have deformed the blob structure.
  • T. Ishida, Y. Ogawa, A. Kadokura, Y. Hiraki, I. Haggstrom
    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 119 (8) 6774 - 6783 2169-9380 2014/08 [Refereed][Not invited]
     
    We have conducted a statistical analysis of the ionospheric F region trough, focusing on its seasonal variation and solar activity dependence under geomagnetically quiet and moderate conditions, using plasma parameter data obtained via Common Program 3 observations performed by the European Incoherent Scatter (EISCAT) radar between 1982 and 2011. We have confirmed that there is a major difference in frictional heating between the high-and low-latitude sides of the EISCAT field of view (FOV) at similar to 73 degrees 0'N-60 degrees 5'N (geomagnetic latitude) at an altitude of 325 km, which is associated with trough formation. Our statistical results show that the high-latitude and midlatitude troughs occur on the high- and low-latitude sides of the FOV, respectively. Seasonal variations indicate that dissociative recombination accompanied by frictional heating is a main cause of trough formation in sunlit regions. During summer, therefore, the occurrence rate is maintained at 80-90% in the postmidnight high-latitude region owing to frictional heating by eastward return flow. Solar activity dependence on trough formation indicates that field-aligned currents modulate the occurrence rate of the trough during the winter and equinox seasons. In addition, the trough becomes deeper via dissociative recombination caused by an increased ion temperature with F-10.7, at least in the equinox and summer seasons but not in winter.
  • A. Grocott, K. Hosokawa, T. Ishida, M. Lester, S. E. Milan, M. P. Freeman, N. Sato, A. S. Yukimatu
    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 118 (9) 5830 - 5841 2169-9380 2013/09 [Refereed][Not invited]
     
    We present a survey of medium-scale traveling ionospheric disturbances (MSTIDs) observed by a Super Dual Auroral Radar Network HF radar located in the Falkland Islands between May 2010 and April 2011. The radar has a field of view that overlooks the Antarctic Peninsula, a known hot spot of gravity wave activity. We present observations of radar ground-backscatter data, in which the signatures of MSTIDs are manifested as structured enhancements in echo power. Observed periods were in the range 30-80min, corresponding to frequencies of 0.2-0.6mHz. Wavelengths were generally in the range 200-800km and phase speeds in the range 100-300ms(-1). These values are within the ranges typically associated with medium-scale gravity waves. We find a primary population of northward (equatorward) propagating MSTIDs, which demonstrate an association with enhanced solar wind-magnetosphere coupling and a smaller, westward propagating population, that could be associated with atmospheric gravity waves excited by winds over the Andean and Antarctic Peninsula mountains or by the high winds of the Antarctic Polar Vortex.
  • T. Ishida, K. Hosokawa, T. Shibata, S. Suzuki, N. Nishitani, T. Ogawa
    GEOPHYSICAL RESEARCH LETTERS 35 (13) 1 - 6 0094-8276 2008/07 [Refereed][Not invited]
     
    The propagation parameters of daytime medium-scale traveling ionospheric disturbances (MSTIDs) are investigated for the first time using near-simultaneous SuperDARN radar data obtained at auroral and middle latitudes. The observations suggest that MSTIDs can propagate from auroral to mid-latitudes with persistent propagation parameters if the dominant propagation direction is approximately equatorward. However, statistical analysis implies that a portion of MSTIDs with higher horizontal phase velocity are unable to reach the mid-latitude due to enhanced dissipation and the reduction of the ion-drag effect.

Books etc

  • Unmanned Aerial Vehicle: Applications in Agriculture and Environment
    Kurihara, J, T. Ishida, Y. Takahashi (Joint workUAV-based hyperspectral imaging system for precision agriculture and forest management)
    Springer 2019/12 (ISBN: 9783030271565) 129 25-38

Conference Activities & Talks

  • Updates on Philippines microsatellites DIWATA-1 and DIWATA-2  [Not invited]
    Ishida, T, M. J. Felix, E. C. Castro, H. C. Merida, S. B. Namuco, F. M. Felicio, K. K. Vergel, G. J. Perez, J. J. Marciano, Y. Takahashi
    JpGU Meeting 2019  2019/05
  • Vegetation classification using UAV-based hyperspectral imaging  [Not invited]
    Ishida, T, J. Kurihara, Y. Takahashi
    JpGU Meeting 2018  2018/05
  • Vegetation classification using UAV-based hyperspectral imaging  [Not invited]
    Ishida, T, J. Kurihara, Y. Takahashi
    第63回(平成29年度秋季)日本リモートセンシング学会学術講演会  2017/11
  • Cloud monitoring by the Philippines first micro-satellite DIWATA-1  [Invited]
    Castro, E, T. Ishida, Y. Takahashi
    SATREPS Kick-off Workshop  2017/05
  • Overview of Space S&T projects in the Space Mission Center of Hokkaido University  [Invited]
    Tetsuro Ishida
    PHL-Microsat Program Review and Scientific Forum  2016/11
  • Microsatellite constellation for the Earth and space environment  [Not invited]
    Ishida. T, Y. Takahashi, J. Kurihara, T. Nagatsuma
    第60回宇宙科学技術連合講演会  2016/09
  • The review of the fieldworks for Philippines micro-satellite project  [Invited]
    Ishida. T, Y. Takahashi, E. C. Paringit, G. J. Perez
    JpGU Meeting 2016  2016/05
  • Airborne campaign using LCTF multi-spectral camera in Northern Samar  [Not invited]
    Ishida. T, Y. Takahashi, J. Kurihara, E. C. Paringit, F. A. Viray, G. J. Perez, S. Namuco
    The 36th Asian Conference on Remote Sensing  2015/10
  • International collaboration between the Philippines and Japan for the Philippine Scientific Earth Observation Micro-Satellite  [Invited]
    Tetsuro Ishida
    18th Geodetic Engineering Department Seminar  2015/08
  • Seasonal variation and solar activity dependence of the quiet-time ionospheric trough  [Not invited]
    Ishida. T, Y. Ogawa, A. Kadokura, Y. Hiraki, I. Häggström
    Fourth International Symposium on Arctic Research  2015/04
  • Seasonal variation and solar activity dependence of the quiet-time ionospheric trough  [Not invited]
    Ishida, T, Y. Ogawa, A. Kadokura, Y. Hiraki, I. Häggström
    The Fifth Symposium on Polar Science  2014/12
  • Electron density structure in the vicinity of the trough boundary  [Not invited]
    Ishida, T, Y. Ogawa, A. Kadokura, K. Hosokawa, Y. Otsuka
    2014 SGEPSS Fall Meeting  2014/11
  • Temporal variation of electron density in the vicinity of the ionospheric trough  [Not invited]
    Ishida, T, Y. Ogawa, A. Kadokura, K. Hosokawa, Y. Otsuka
    JpGU Meeting 2014  2014/04
  • Multi-timescale statistical analysis of ionospheric trough with long-term EISCAT dataset  [Not invited]
    Ishida, T, Y. Ogawa, A. Kadokura, Y. Hiraki, I. Häggström
    The Fourth Symposium on Polar Science  2013/11
  • Multi-timescale statistical analysis of ionospheric trough with long-term EISCAT dataset  [Not invited]
    Ishida, T, Y. Ogawa, A. Kadokura, Y. Hiraki, I. Häggström
    International CAWSES-II Symposium  2013/11
  • Multi-timescale statistical analysis of ionospheric trough with long-term EISCAT dataset  [Not invited]
    Ishida, T, Y. Ogawa, A. Kadokura, Y. Hiraki, I. Häggström
    2013 SGEPSS Fall Meeting  2013/11
  • Multi-timescale statistical analysis of ionospheric trough with long-term EISCAT dataset  [Not invited]
    Ishida, T, Y. Ogawa, A. Kadokura, I. Häggström
    16th International EISCAT symposium  2013/08
  • Multi-timescale statistical analysis of ionospheric trough with long-term EISCAT dataset  [Not invited]
    Ishida, T, Y. Ogawa, A. Kadokura, I. Häggström
    JpGU Meeting 2013  2013/05
  • Study on spatiotemporal variations of ionospheric trough in auroral/subauroral region  [Not invited]
    Ishida, T, Y. Ogawa, A. Kadokura, I. Häggström
    The Third Symposium on Polar Science  2012/11
  • Characteristics of the MSTIDs’ long-range propagation: simultaneous observations at auroral and mid-latitudes  [Not invited]
    Ishida, T, K. Hosokawa, T. Shibata, N. Nishitani
    2007 SGEPSS Fall Meeting  2007/09
  • Direct comparison of MSTIDs observed at different latitudes  [Not invited]
    Ishida, T, K. Hosokawa, T. F. Shibata, N. Nishitani
    SuperDARN Workshop 2007  2007/06
  • Direct comparison of MSTIDs observed at different latitudes  [Not invited]
    Ishida, T, K. Hosokawa, S. Shimizu, N. Natsuo, A.S. Yukimatsu, I. Tomizawa, T. Shibata, A. Saito, N. Nishitani
    JpGU Meeting 2007  2007/05
  • Direct comparison of MSTIDs observed with SuperDARN, GPS-TEC and HF Doppler at different latitudes  [Not invited]
    Ishida, T, K. Hosokawa, S. Shimizu, N. Natsuo, A.S. Yukimatsu, I. Tomizawa, T. Shibata, A. Saito
    2006 SGEPSS Fall Meeting  2006/11
  • Direct comparison of MSTIDs observed at different latitudes  [Not invited]
    Ishida, T, K. Hosokawa, S. Shimizu, N. Natsuo, A.S. Yukimatsu, I. Tomizawa, T. Shibata
    JpGU Meeting 2006  2006/05

Industrial Property Rights

  • 特許JP6321895B2:Spectral camera control device, spectral camera control program, spectral camera control system, aircraft equipped with said system, and spectral image capturing method    2018/05/09
    Takahashi, Y, J. Kurihara, T. Ishida
  • 特許WO2017179378A1:Spectral camera control device, spectral camera control program, spectral camera control system, aircraft equipped with said system, and spectral image capturing method    2017/10/19
    Takahashi, Y, J. Kurihara, T. Ishida

Awards & Honors

  • 2014/04 Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS) SGEPSS Student Presentation Award (Aurora Medal)
     
    受賞者: Tetsuro Ishida
  • 2013/05 EISCAT Scientific Association EISCAT Peer-reviewed Program
     
    受賞者: Tetsuro Ishida

Research Grants & Projects

  • 家畜糞尿由来廃棄物の農地散布を最適化するための衛星画像利用システムの開発
    Ministry of Education, Culture, Sports, Science and Technology:宇宙航空科学技術推進委託費
    Date (from‐to) : 2019/10 -2022/03 
    Author : Yoshitaka Uchida
  • サブオーロラ帯/オーロラ帯トラフの様々な時間スケールに対する構造変動の研究
    Japan Society for the Promotion of Science:Research Fellowships for Young Scientists
    Date (from‐to) : 2013/04 -2015/03 
    Author : Tetsuro Ishida


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