Geo-effectiveness of CMEs

Journal of astrophysics and astronomy

K. N. Iyer⁴  Ajaysinh K. Jadeja³  P. K. Manoharan¹  Hari Om Vats² 

[1] Radio Astronomy Centre, Tata Institute of Fundamental Research, Ooty 643 001, India.$$;Physical Research Laboratory, Ahmedabad 380 009, India.$$;Christ College, Saurashtra University, Rajkot 360 005, India.$$;Department of Physics, Saurashtra University, Rajkot 360 005, India.$$

关键词: Coronal mass ejection;    interplanetary medium and normamalized scintillation index.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Coronal Mass Ejections (CMEs) are important phenomena in coronal dynamics causing interplanetary signatures (ICMEs). They eject large amounts of mass and magnetic fields into the heliosphere, causing major geomagnetic storms and interplanetary shocks. Geomagnetic storms are often characterized by abrupt increases in the northward component of the earth’s field, called sudden commencements (SSC) followed by large decreases of the magnetic field and slow recovery to normal values. The SSCs are well correlated with IP shocks. Here a case study of 10–15 February 2000 and also the statistical study of CME events observed by IPS array, Rajkot, during the years 2000 to 2003 and Radio Astronomy Center, Ooty are described. The geomagnetic storm index Dst, which is a measure of geo-effectiveness, is shown to be well correlated with normalized scintillation index `g', derived from Ooty Radio Telescope (ORT) observations.

【 授权许可】

Unknown