Neutral atom emission coming from the direction of the high-latitude magnetopause under northward IMF

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Abstract

The Low Energy Neutral Atom (LENA) imager on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft in the magnetosphere can detect neutral particles coming from the direction of the magnetopause. During a period of dynamic pressure of ~6 nPa and IMF B_Z of ~15nT on March 27, 2001, significant neutral atom emissions occurred in the direction of the very high-latitude magnetopause. Simultaneous observations from IMAGE/LENA and SuperDARN radar show that the LENA emission appears concurrently with the enhancement of the sunward flow of the reverse convection in the ionosphere. In a recent paper (S. Taguchi et al., Geophys. Res. Lett., 33, L03101, doi: 10.1029/2005GL025020, 2006) this type of emission has been interpreted as being produced by the fast ion flow caused by cusp reconnection through charge exchange with the Earth's hydrogen exosphere. In other words, remote sensing using LENA imager can be applied in order to determine the stability of the reconnection site. From results of analyses of LENA emission data we show that the reconnection "spot" mapped on a sphere having a radius of 8 R_E shifts tailward by approximately 1 R_E over 10min while fluctuating.

The Low Energy Neutral Atom (LENA) imager on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft in the magnetosphere can detect neutral particles coming from the direction of the magnetopause. During a period of dynamic pressure of 〜6 nPa and IMF B_Z of 〜15nT on March 27, 2001, significant neutral atom emissions occurred in the direction of the very high-latitude magnetopause. Simultaneous observations from IMAGE/LENA and SuperDARN radar show that the LENA emission appears concurrently with the enhancement of the sunward flow of the reverse convection in the ionosphere. In a recent paper (S. Taguchi et al., Geophys. Res. Lett., 33, L03101, doi: 10.1029/2005GL025020, 2006) this type of emission has been interpreted as being produced by the fast ion flow caused by cusp reconnection through charge exchange with the Earth's hydrogen exosphere. In other words, remote sensing using LENA imager can be applied in order to determine the stability of the reconnection site. From results of analyses of LENA emission data we show that the reconnection "spot" mapped on a sphere having a radius of 8 R_E shifts tailward by approximately 1 R_E over 10min while fluctuating.

Journal

  • Advances in polar upper atmosphere research

    Advances in polar upper atmosphere research (20), 17-26, 2006-08

    National Institute of Polar Research

Codes

  • NII Article ID (NAID)
    110004739287
  • NII NACSIS-CAT ID (NCID)
    AA11397422
  • Text Lang
    ENG
  • Article Type
    departmental bulletin paper
  • ISSN
    13451065
  • Data Source
    NII-ELS  IR 
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