Journal of Astrophysics and Astronomy

, Volume 29, Issue 1, pp 287-291

First online:

Geo-effectiveness of CMEs

  • Ajaysinh K. JadejaAffiliated withChrist College, Saurashtra University
  • , K. N. IyerAffiliated withDepartment of Physics, Saurashtra University
  • , Hari Om VatsAffiliated withPhysical Research Laboratory
  • , P. K. ManoharanAffiliated withRadio Astronomy Centre, Tata Institute of Fundamental Research

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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.

Key words

Coronal mass ejection interplanetary medium and normamalized scintillation index