Journal of Astrophysics and Astronomy

, Volume 29, Issue 1–2, pp 287–291 | Cite as

Geo-effectiveness of CMEs

  • Ajaysinh K. Jadeja
  • K. N. Iyer
  • Hari Om Vats
  • P. K. Manoharan


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 


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Copyright information

© Indian Academy of Sciences 2008

Authors and Affiliations

  • Ajaysinh K. Jadeja
    • 1
  • K. N. Iyer
    • 2
  • Hari Om Vats
    • 3
  • P. K. Manoharan
    • 4
  1. 1.Christ CollegeSaurashtra UniversityRajkotIndia
  2. 2.Department of PhysicsSaurashtra UniversityRajkotIndia
  3. 3.Physical Research LaboratoryAhmedabadIndia
  4. 4.Radio Astronomy CentreTata Institute of Fundamental ResearchOotyIndia

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