A World-Wide Annual Variation in Sq

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The amplitude of the annual variation in the horizontal component of <I>Sq</I> is larger in the southern hemisphere than the northern hemisphere. This asymmetry may be represented as the superposition of a world-wide annual variation with its maximum at or near perihelion and summer-winter annual variations of equal amplitudes in the two hemispheres and maxima at the local summer solstice. The amplitude of the world-wide annual variation, as a fraction of the yearly mean value of <I>Sq</I>, is about 0.07 ± 0.02. The variation in ionospheric conductivity associated with the earth's orbital eccentricity is inadequate alone to account for this annual variation in <I>Sq</I>. If joule heating by the <I>Sq</I> currents is appreciable, its annual and semi-annual variations could account for the similar variations in the temperature of the thermosphere.

収録刊行物

  • Journal of geomagnetism and geoelectricity  

    Journal of geomagnetism and geoelectricity 47(10), 1029-1031, 1995-10 

    Society of Geomagnetism and Earth, Planetary and Space Sciences

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各種コード

  • NII論文ID(NAID)
    10002027990
  • NII書誌ID(NCID)
    AA00698879
  • 本文言語コード
    ENG
  • 資料種別
    SHO
  • ISSN
    00221392
  • データ提供元
    CJP書誌  J-STAGE 
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