A balloon observation of auroral X-ray images in the northern auroral zone

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概要

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• A balloon observation of auroral X-rays has been carried out by using two kinds of X-ray imagers, i.e., a newly developed imager with 5×5 matrix array of Si(Li) semiconductor detectors (SSD's) and another one with one-dimen-sional array of 8 NaI (Tl) scintillation counters. Each of these two imagers has a pinhole collimator, which gives a resolution angle of 15°at the central detector (counter). The lower limits of X-ray energy measurable are 37 and 22keV for the SSD and NaI(Tl) imagers, respectively. The balloon carrying these imagers was launched from Abelver, Norway at 2117 UT on July 5,1985 and was flown toward lceland. An enhancement of auroral X-ray flux was observed in the location of L=5.2 at ∿ 2334 MLT near the geomagnetic midnight, during a geomagnetic substorm. Temporal variation of two-dimensional auroral X-ray images was derived with 3 s time resolution from SSD imager data. Also, another imager of NaI(Tl) counters confirmed the SSD results. It is shown that a sequence of auroral X-ray images obtained by two imagers are not like a stable arc structure but a localized structure with a rapid time variation. The present results suggest that localized intermittent precipitations of energetic electrons with several tens keV or greater are possible.

• 国立極地研究所の論文

著者

• MURAKAMI Hiroyuki

  Department of Physics, Rikkyo University

• Nishimura Jun

  Institue Of Space And Astronautical Sci. Japan Aerospace Exploration Agency

• Yamagami Takamasa

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• Yamagami Takamasa

  Institute Of Space And Astronautical Science

• Yamagami Takamasa

  The Institute Of Space And Astronautical Science

• 中本 淳

  立大理

• Ohta Shigeo

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• SUZUKI Hiromu

  Department of Biochemistry, Cancer Research Institute, Sapporo Medical University

• Namiki Michiyoshi

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• Sato Natsuo

  National Institude of Polar Research

• Hirayama M

  Kyoto Univ. Kyoto

• Suzuki Hiromu

  Faculty Of Science Rikkyo University

• Suzuki Hiromu

  Department Of Biochemistry Cancer Research Institute

• Fujii Ryoichi

  National Institute of Polar Research

• Miyaoka Hiroshi

  National Institute of Polar Research

• Kodama Masahiro

  Department of Physics, Yamanashi Medical College

• Ohta Shigeo

  The Institute of Space and Astronautical Science

• Namiki Michiyoshi

  The Institute of Space and Astronautical Science

• Nishimura Jun

  The Institute of Space and Astronautical Science

• Hirasima Yo

  Department of Physics, Rikkyo University

• Okudaira Kiyoaki

  Department of Physics, Rikkyo University

• Nakamoto Atsushi

  Department of Physics, Rikkyo University

• Kodama Masahiro

  The Institute Of Physical And Chemical Research

• Sato N

  National Institute Of Polar Research

• Fujii R

  Nagoya Univ. Nagoya Jpn

• Nishimura Jun

  Institute Of Space And Astronautical Science

• Miyaoka H

  Department Of Physics Rikkyo University

• Hirasima Yo

  Department Of Physics Rikkyo University

• Okudaira Kiyoaki

  Department Of Physics Rikkyo University

• Okudaira Kiyoaki

  Department Of Physics Faculty Of Science Rikkyo University

• Nakamoto Atsushi

  Department Of Chemistry School Of Science Kitasato University

• Kodama M

  Biology Laboratory Faculty Of Education Art And Science Yamagata University

• Kodama Masahiro

  Department Of Physics Yamanashi Medical College

• Murakami Hiroyuki

  Department Of Earth Science Faculty Of Science Osaka University

• Yamagami Takamasa

  Institute Of Space And Astronautical Science Jaxa.

• Murakami Hiroyuki

  Department Of Aerospace Engineering Tokyo Metropolitan Institute Of Technology

• Nishimura Jun

  Institute Of Space And Aeronautical Science University Of Tokyo

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