The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform

Wataru Miyake - One of the best experts on this subject based on the ideXlab platform.

  • Terrestrial plasmaspheric imaging by an Extreme Ultraviolet Scanner on planet‐B
    Geophysical Research Letters, 2000
    Co-Authors: M. Nakamura, Ichiro Yoshikawa, Atsuko Yamazaki, K. Shiomi, Yoshiyuki Takizawa, Masafumi Hirahara, Koujun Yamashita, Y. Saito, Wataru Miyake
    Abstract:

    An extreme ultraviolet (XUV) scanner on board the Mars Orbiter, Planet-B, observed the terrestrial plasmasphere while it was in a Parking Orbit around the earth. The image was available only for the dusk side of the plasmasphere. Nonetheless, this was the first image from the outside of the plasmasphere. Future missions, such as the NASA IMAGE mission in 2000 as well as the Japanese plasmaspheric imaging telescope on SELENE in 2003 will provide further information on this region.

  • Helium observation in the Martian ionosphere by an X-ray ultraviolet scanner on Mars Orbiter NOZOMI
    Earth Planets and Space, 1999
    Co-Authors: M. Nakamura, Ichiro Yoshikawa, Atsuko Yamazaki, K. Shiomi, Yoshiyuki Takizawa, Masafumi Hirahara, Koujun Yamashita, Wataru Miyake, S. Sasaki, Y. Saito
    Abstract:

    We have built an X-ray ultraviolet (XUV) scanner on board Mars Orbiter NOZOMI (Planet-B). This scanner has the He I and II emissions from the Martian atmosphere and ionosphere as its main target. These EUV emissions provide important information for the study of both Martian geological history and the interaction between solar wind and the Martian ionosphere. The XUV scanner will be operated in the Parking Orbit around the earth and also in the transfer Orbit to Mars, where the terrestrial plasmasphere and interplanetary emissions will be studied.

M. Nakamura - One of the best experts on this subject based on the ideXlab platform.

  • Terrestrial plasmaspheric imaging by an Extreme Ultraviolet Scanner on planet‐B
    Geophysical Research Letters, 2000
    Co-Authors: M. Nakamura, Ichiro Yoshikawa, Atsuko Yamazaki, K. Shiomi, Yoshiyuki Takizawa, Masafumi Hirahara, Koujun Yamashita, Y. Saito, Wataru Miyake
    Abstract:

    An extreme ultraviolet (XUV) scanner on board the Mars Orbiter, Planet-B, observed the terrestrial plasmasphere while it was in a Parking Orbit around the earth. The image was available only for the dusk side of the plasmasphere. Nonetheless, this was the first image from the outside of the plasmasphere. Future missions, such as the NASA IMAGE mission in 2000 as well as the Japanese plasmaspheric imaging telescope on SELENE in 2003 will provide further information on this region.

  • Helium observation in the Martian ionosphere by an X-ray ultraviolet scanner on Mars Orbiter NOZOMI
    Earth Planets and Space, 1999
    Co-Authors: M. Nakamura, Ichiro Yoshikawa, Atsuko Yamazaki, K. Shiomi, Yoshiyuki Takizawa, Masafumi Hirahara, Koujun Yamashita, Wataru Miyake, S. Sasaki, Y. Saito
    Abstract:

    We have built an X-ray ultraviolet (XUV) scanner on board Mars Orbiter NOZOMI (Planet-B). This scanner has the He I and II emissions from the Martian atmosphere and ionosphere as its main target. These EUV emissions provide important information for the study of both Martian geological history and the interaction between solar wind and the Martian ionosphere. The XUV scanner will be operated in the Parking Orbit around the earth and also in the transfer Orbit to Mars, where the terrestrial plasmasphere and interplanetary emissions will be studied.

Y. Saito - One of the best experts on this subject based on the ideXlab platform.

  • Terrestrial plasmaspheric imaging by an Extreme Ultraviolet Scanner on planet‐B
    Geophysical Research Letters, 2000
    Co-Authors: M. Nakamura, Ichiro Yoshikawa, Atsuko Yamazaki, K. Shiomi, Yoshiyuki Takizawa, Masafumi Hirahara, Koujun Yamashita, Y. Saito, Wataru Miyake
    Abstract:

    An extreme ultraviolet (XUV) scanner on board the Mars Orbiter, Planet-B, observed the terrestrial plasmasphere while it was in a Parking Orbit around the earth. The image was available only for the dusk side of the plasmasphere. Nonetheless, this was the first image from the outside of the plasmasphere. Future missions, such as the NASA IMAGE mission in 2000 as well as the Japanese plasmaspheric imaging telescope on SELENE in 2003 will provide further information on this region.

  • Helium observation in the Martian ionosphere by an X-ray ultraviolet scanner on Mars Orbiter NOZOMI
    Earth Planets and Space, 1999
    Co-Authors: M. Nakamura, Ichiro Yoshikawa, Atsuko Yamazaki, K. Shiomi, Yoshiyuki Takizawa, Masafumi Hirahara, Koujun Yamashita, Wataru Miyake, S. Sasaki, Y. Saito
    Abstract:

    We have built an X-ray ultraviolet (XUV) scanner on board Mars Orbiter NOZOMI (Planet-B). This scanner has the He I and II emissions from the Martian atmosphere and ionosphere as its main target. These EUV emissions provide important information for the study of both Martian geological history and the interaction between solar wind and the Martian ionosphere. The XUV scanner will be operated in the Parking Orbit around the earth and also in the transfer Orbit to Mars, where the terrestrial plasmasphere and interplanetary emissions will be studied.

Min-jea Tahk - One of the best experts on this subject based on the ideXlab platform.

  • Three-dimensional trajectory optimization of soft lunar landings from the Parking Orbit with considerations of the landing site
    International Journal of Control Automation and Systems, 2011
    Co-Authors: Bong-gyun Park, Min-jea Tahk
    Abstract:

    Minimum fuel, three-dimensional trajectory optimization from a Parking Orbit considering the desired landing site is addressed for soft lunar landings. The landing site is determined by the final longitude and latitude; therefore, a two-dimensional approach is limited and a three-dimensional approach is required. In addition, the landing site is not usually considered when performing lunar landing trajectory optimizations, but should be considered in order to design more accurate and realistic lunar landing trajectories. A Legendre pseudospectral (PS) method is used to discretize the trajectory optimization problem as a nonlinear programming (NLP) problem. Because the lunar landing consists of three phases including a de-Orbit burn, a transfer Orbit phase, and a powered descent phase, the lunar landing problem is regarded as a multiphase problem. Thus, a PS knotting method is also used to manage the multiphase problem, and C code for Feasible Sequential Quadratic Programming (CFSQP) using a sequential quadratic programming (SQP) algorithm is employed as a numerical solver after formulating the problem as an NLP problem. The optimal solutions obtained satisfy all constraints as well as the desired landing site, and the solutions are verified through a feasibility check.

  • Two-dimensional Trajectory Optimization of a Soft Lunar Landing from a Parking Orbit Considering a Landing Site
    IFAC Proceedings Volumes, 2010
    Co-Authors: Jong-sun Ahn, Bong-gyun Park, Min-jea Tahk
    Abstract:

    Abstract In this paper, minimum-fuel, two-dimensional trajectory optimization from a Parking Orbit to the desired landing site is presented. The landing site is usually not considered when performing the trajectory optimization. However, to design the precise trajectories to land at the desired site, the landing site has to be considered as the terminal constraint. To convert the trajectory optimization problem into a parameter optimization problem, a pseudospcetral (PS) method is used, and CFSQP is used as a numerical solver. To check that the results obtained are good solutions, the feasibility check is performed.

Ichiro Yoshikawa - One of the best experts on this subject based on the ideXlab platform.

  • Terrestrial plasmaspheric imaging by an Extreme Ultraviolet Scanner on planet‐B
    Geophysical Research Letters, 2000
    Co-Authors: M. Nakamura, Ichiro Yoshikawa, Atsuko Yamazaki, K. Shiomi, Yoshiyuki Takizawa, Masafumi Hirahara, Koujun Yamashita, Y. Saito, Wataru Miyake
    Abstract:

    An extreme ultraviolet (XUV) scanner on board the Mars Orbiter, Planet-B, observed the terrestrial plasmasphere while it was in a Parking Orbit around the earth. The image was available only for the dusk side of the plasmasphere. Nonetheless, this was the first image from the outside of the plasmasphere. Future missions, such as the NASA IMAGE mission in 2000 as well as the Japanese plasmaspheric imaging telescope on SELENE in 2003 will provide further information on this region.

  • Helium observation in the Martian ionosphere by an X-ray ultraviolet scanner on Mars Orbiter NOZOMI
    Earth Planets and Space, 1999
    Co-Authors: M. Nakamura, Ichiro Yoshikawa, Atsuko Yamazaki, K. Shiomi, Yoshiyuki Takizawa, Masafumi Hirahara, Koujun Yamashita, Wataru Miyake, S. Sasaki, Y. Saito
    Abstract:

    We have built an X-ray ultraviolet (XUV) scanner on board Mars Orbiter NOZOMI (Planet-B). This scanner has the He I and II emissions from the Martian atmosphere and ionosphere as its main target. These EUV emissions provide important information for the study of both Martian geological history and the interaction between solar wind and the Martian ionosphere. The XUV scanner will be operated in the Parking Orbit around the earth and also in the transfer Orbit to Mars, where the terrestrial plasmasphere and interplanetary emissions will be studied.