@article{oai:nipr.repo.nii.ac.jp:00008118,
 author = {藤井, 良一 and 飯島, 健 and FUJII, Ryoichi and IIJIMA, Takeshi},
 journal = {南極資料},
 month = {Feb},
 note = {P(論文), TRIAD衛星により,北半球高緯度地方で観測された磁場データを解析して,沿磁力線電流(FAC)の季節変化を調べ,以下の結果を得た.1)昼間部分ではFAC強度は,季節と共に変動する.夏のFAC強度は,冬のそれと比べて約2倍大きい.それに対し,夜間部分ではFACの季節変化は,ほとんど見られない.2)夏の単層構造のFACの強度期待値は,冬のそれと比べて十分大であるが,2重層構造については,季節変化はあまり見られない.また,単層構造のFACの最大強度領域は冬になると夏に比べて昼間領域に近づく.3)単層および2重層構造両方のFACを考慮に入れると,電離層に入り込むFACの総量は,出るFACの総量に10%の誤差の範囲で等しい.4)季節変化を取り除いたのちには,地磁気活動度に対するFACの依存性が見られる.地磁気活動度が増加すれば,FAC強度も増加する.Kp≤2から2<Kp≤4に変わる時のFAC総量の増加は,冬から夏に変わった時の各地磁気活動度でのFAC総量の増加より大であるが,各2MLTでの季節変化の効果を無視することはできない.5)FACの位置の季節変化は,昼間部分で著しく見られた.夏のFACの緯度は,冬のそれに比べて高い.6)昼間のFAC分布構造は複雑であるが,統計的には折れまがりの見られることもあった., From magnetometer data obtained by TRIAD in the northern high latitudes, seasonal variations of field-aligned currents (FAC) are investigated. 1) In the dayside region intensities of FAC's vary with seasons. The intensity of FAC amplitude in summer is about twice as large as that in winter. 0n the contrary there are no seasonal variations of FAC's in the hightside region 2) Expected value of single structured FAC in summer is much greater than that in winter whereas expected value of double structured one in summer is nearly comparable to that in winter. The maximum intensity region of single structured FAC in winter is located at more dayside region than that in summer. 3) From the analysis of the data observed at the northern high latitudes, each type of FAC (single and double structured) is balanced by itself within the error of 10% 4) After separating the effect of seasonal variations of FAC's thete remains the dependence of FAC upon geomagnetic activity. With geomagnetic activity increasing. FAC intensity increases. The contribution of seasonal variations to total current input and output is less than that of geomagnetic activity variation from Kp&#8804;2 to 2<Kp&#8804;4 However, the contribution of seasonal variation to FAC's for each 2-hour MLT segment cannot be nealected. 5) FAC location varies with seasons especially in the dayside region. Location in summer is higher than that in winter in the dayside region. 6) The distribution of FAC in the midday region was statistically found to exhibit a kink},
 pages = {69--87},
 title = {Field-Aligned Currentsの季節変化(b.電場と電流系)(第2回極域における電離圏磁気圏総合観測シンポジウム : Part I)},
 volume = {68},
 year = {1980},
 yomi = {フジイ, リョウイチ and イイジマ, タケシ}
}