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천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

벤 앨런대에서 초상대론적 전자에 대한 침투 불가능한 장벽

An impenetrable barrier to ultrarelativistic electrons in the Van Allen radiation belts
  • 작성자 : KASI
  • 작성일 : 2014-12-04
  • 조회수 : 3760
  • 저자D. N. Baker, A. N. Jaynes, V. C. Hoxie, et al.
  • Absract

     

    Early observations indicated that the Earth’s Van Allen radiation belts could be separated into an inner zone dominated by high-energy protons and an outer zone dominated by high-energy electrons. Subsequent studies showed that electrons of moderate energy (less than about one megaelectronvolt) often populate both zones, with a deep ‘slot’ region largely devoid of particles between them. There is a region of dense cold plasma around the Earth known as the plasmasphere, the outer boundary of which is called the plasmapause. The two-belt radiation structure was explained as arising from strong electron interactions with plasmaspheric hiss just inside the plasmapause boundary, with the inner edge of the outer radiation zone corresponding to the minimum plasmapause location. Recent observations have revealed unexpected radiation belt morphology, especially at ultrarelativistic kinetic energies(more than five megaelectronvolts). Here we analyse an extended data set that reveals an exceedingly sharp inner boundary for the ultrarelativistic electrons. Additional, concurrently measured data reveal that this barrier to inward electron radial transport does not arise because of a physical boundary within the Earth’s intrinsic magnetic field, and that inward radial diffusion is unlikely to be inhibited by scattering by electromagnetic transmitter wave fields. Rather, we suggest that exceptionally slow natural inward radial diffusion combined with weak, but persistent, wave–particle pitch angle scattering deep inside the Earth’s plasmasphere can combine to create an almost impenetrable barrier through which the most energetic Van Allen belt electrons cannot migrate.


  • 게재정보NATURE(2014.11.27)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v515/n7528/pdf/nature13956.pdf
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