자기폭풍 기간 동안의 월별 누적 오로라 제트전류 지수, Dst 지수 및 행성간 전기장 사이의 상관관계

• Published in: Journal of astronomy and space sciences 2005, 22(4), , pp.409-418
• Main Authors: 박윤경, 안병호, 문가희, Park, Yoon-Kyung, Ahn, Byung-Ho, Moon, Ga-Hee
• Format: Article
• Language: Korean
• Subjects: 천문학
• ISSN: 2093-5587; 2093-1409

Magnetospheric substorms occur frequently during magnetic storms, suggesting that the two phenomena are closely associated. We can investigate the relation between magnetospheric substorms and magnetic storms by examining the correlation between AE and Dst indices. For this purpose, we calculated the monthly cumulative AU, $|$AL$|$ and $|$Dst$|$ indices. The correlation coefficient between the monthly cumulative $|$AL$|$ and $|$Dst$|$ index is found to be 0.60, while that between monthly cumulative AU and $|$Dst$|$ index is 0.28. This result indicates that substorms seem to contribute to the development of magnetic storms. On the other hand, it has been reported that the interplanetary electric field associated with southward IMF intensifies the magnetospheric convection, which injects charged particles into the inner magnetosphere, thus developing the ring current. To evaluate the contribution of the interplanetary electric field to the development of the storm time ring current belt, we compared the monthly cumulative interplanetary electric field and the monthly cumulative Dst index. The correlation coefficient between the two cumulative indices is 0.83 for southward IMF and 0.39 for northward IMF. It indicates that magnetospheric convection induced by southward IMF is also important in developing magnetic storms. Therefore, both magnetospheric substorm and enhanced magnetospheric convection seem to contribute to the buildup of magnetic storm. KCI Citation Count: 0