Astrophysics and Space Science

, Volume 243, Issue 1, pp 221–224 | Cite as

Solar activity dependence of interplanetary disturbances

  • P. K. Manoharan
IPS and Other Remote Sensing Measurements


Interplanetary scintillation measurements obtained inside 200 R using the Ooty Radio Telescope during August 1986–April 1991 have been analysed to study the interplanetary disturbances (or events) and their occurrence rates at various phases of the solar cycle. The disturbances are identified by the increase in the level of scintillation compared with the expected value. In total, 735 events have been identified. The results show a rate of 0.49 events per day near solar maximum and a low rate of 0.16 events per day during minimum of activity. The results are compared with coronal mass ejection (CME) rates and transients rates obtained from the Doppler scintillation measurements.


Solar Activity Solar Cycle Coronal Mass Ejection Occurrence Rate Radio Telescope 
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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • P. K. Manoharan
    • 1
  1. 1.Radio Astronomy Centre (TIFR)OotyIndia

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