Geomagnetic negative sudden impulse due to a magnetic cloud observed on May 13, 1995

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書誌事項

公開日
2000-08
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2000ja900055
公開者
American Geophysical Union (AGU)

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説明

<jats:p>A geomagnetic negative sudden impulse (SI<jats:sub>−</jats:sub>) observed on May 13, 1995, was examined using magnetic field data from ETS VI and GOES 7 in the magnetosphere and ground geomagnetic observation networks. The SI<jats:sup>−</jats:sup> was caused by a sudden decrease in the solar wind dynamic pressure at the front boundary of a magnetic cloud embedded in a density enhancement region. The amplitude and the fall time at Kakioka geomagnetic observatory (magnetic latitude 26.9°, magnetic longitude 208.3°) were 26 nT and 10 min, respectively. Although SI<jats:sup>−</jats:sup> has been considered to be the mirror image of geomagnetic positive sudden impulse (SI<jats:sup>+</jats:sup>) or sudden commencement (SC), we found the polarization distribution of the SI<jats:sup>−</jats:sup> consistent with that of SC. We suggest that the contribution from the longitudinal movement of a twin‐vortex ionospheric current system is dominant to produce the polarization of SC and SI<jats:sup>−</jats:sup>. We also discuss the relationship between the angle at which discontinuities in the solar wind impinge upon the magnetosphere and the geomagnetic response.</jats:p>

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