Geomagnetic storms and their sources on the sun:the rising phase of the sunspot cycle
| Autor: | Takao, Saito, Syun-Ichi, Akasofu, Shinichi, Watari, Natsuo, Sato, Hiroaki , Misawa |
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| Přispěvatelé: | 東北大学名誉教授, アラスカ大学フェアバンクス校・北極圏研究センター 創立センター長, 情報通信研究機構電磁波計測研究センター, 情報・システム研究機構国立極地研究所, 東北大学大学院理学研究科惑星プラズマ・大気研究センター, Taihaku 3-6-29, Taihaku-ku, Sendai, 982-0212, Founding Director, International Arctic Research Center, University at Alaska Fairbanks. 930 Koyukuk Drive, P.O. Box 747346 Fairbanks, AK 99775-7340, USA., National Institute of Information and Communications Technology.Space Weather and Environment Informatics Laboratory.4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184-8795., National Institute of Polar Research, Research Organization of Information and Systems, Midori-cho 10-3, Tachikawa, Tokyo 190-8518., Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University, Aoba-ku, Sendai, 980-8578. |
| Jazyk: | japonština |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | 南極資料 = Antarctic Record. 57(1):1-15 |
| ISSN: | 0085-7289 |
| Popis: | 太陽は地球よりも千倍以上速く磁極を反転する磁変星なので,大規模現象を記述するために,緯度にhelioGRAPHIC,経度にhelioMAGNETIC という折衷型座標系を適用した.地磁気嵐はその発生の周期性から,突発性と回帰性の二種に大別される.突発性地磁気嵐の原因とされる太陽フレアは,この座標系でNE四半球とSW 四半球に分布し,回帰性磁気嵐の太陽源であるコロナホールは,経度0°と180°線に沿って分布することが明らかになり,この太陽サイクルに依存しない不変則はNEWS の法則と名付けられた.この法則は,流源面中性線がsingle wave として現れる太陽活動下降期に顕著であるが,上昇期にしばしば現れるdouble wave を二つのsingle wave に分けると,それぞれについて下降期と全く同様にNEWS の法則が成立することが明らかとなり,少なくとも上昇・下降期には太陽活動phase にも依存しない不変則であることが明らかになった. Solar phenomena, including solar flares and coronal holes, are considered in the context of a NEWS coordinate system, obtained by application of the heliographic and heliomagnetic coordinate systems to the solar latitude and longitude, respectively. By expressing the occurrence of solar phenomena in terms of NEWS coordinates, we discovered that solar flares tend to converge in the NE and SW quadrants of the solar disk, where they act as sources of sporadic storms. Meanwhile, coronal holes converge to solar longitudes of 0° and 180°, where they are sources of recurrent storms. Because of their concentration in the NE- and SW-quadrants, this correlation is referred to as the 'NEWS law'. The neutral line of the source surface shows a beautiful single wave in its declining phase, while it tends to show a double wave in the rising phase. Solar rotation numbers 2118 to 2119, where the neutral line exhibited two complicated asymmetric waves in both the N-S and S-W directions, were chosen for detailed analysis. Notwithstanding such an extremely complicated case, the NEWS law is satisfied when the double wave is separated into its two single-wave parts. |
| Databáze: | OpenAIRE |
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