摘要：We have examined the long-term behavior (solar-cycle time scale) of annual and semi-annual S q variations.We analyzed geomagnetic data observed at locations that were roughly geographically conjugate in the west Pacific region (Kakioka and Gnangara) during the last five solar cycles (1953–2006).Three-year compound data were constructed for each station for each year.The stationary component \(\{ \overline {S_{\text{q}} } \} _0\) , annual component \(\{ \overline {S_{\text{q}} } \} _1\) , and the semi-annual component \(\{ \overline {S_{\text{q}} } \} _2\) , of the S q variations were derived from the compound data.The solar-activity dependence of the derived three components was evaluated in comparison with the sunspot number \((\bar R)\) .It was found that the amplitudes of all three components ( \(\{ \overline {S_{\text{q}} } \} _0,\{ \overline {S_{\text{q}} } \} _1\) and \(\{ \overline {S_{\text{q}} } \} _2\) ) have a positive linear correlation with the sunspot number.The most remarkable result is that the linear regression coefficient for \(\{ \overline {S_{\text{q}} } \} _0\) is much bigger than those of \(\{ \overline {S_{\text{q}} } \} _1\) and \(\{ \overline {S_{\text{q}} } \} _2\) .The physical mechanisms involved are yet to be understood. Key words S q ionosphere ionospheric current ionospheric conductivity solar activity sunspot number geomagnetism geomagnetic field.
关键词：S q ;ionosphere ;ionospheric current ;ionospheric conductivity ;solar activity ;sunspot number ;geomagnetism ;geomagnetic field
