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Interacting CMEs and their associated flare and SEP activities

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Abstract

We have analyzed a set of 25 interacting events which are associated with the DH type II bursts. These events are selected from the Coronal Mass Ejections (CMEs) observed during the period 1997–2010 in SOHO/LASCO and DH type IIs observed in Wind/WAVES. Their pre and primary CMEs from nearby active regions are identified using SOHO/LASCO and EIT images and their height–time diagrams. Their interacting time and height are obtained, and their associated activities, such as, flares and Solar Energetic Particles (>10 pfu) are also investigated. Results from the analysis are: primary CMEs are much faster than the pre-CMEs, their X-ray flares are also stronger (X- and M-class) compared to the flares (C- and M-class) of pre-CMEs. Most of the events (22/25) occurred during the period 2000–2006. From the observed width and speed of pre and primary CMEs, it is found that the pre-CMEs are found to be less energetic than the primary CMEs. While the primary CMEs are tracked up to the end of LASCO field of view (30 Rs), most of the pre-CMEs can be tracked up to <26 Rs. The SEP intensity is found to be related with the integrated flux of X-ray flares associated with the primary CMEs for nine events originating from the western region.

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Acknowledgement

We would like to thank Prof. P.K. Manoharan (Radio Astronomy Centre, NCRA-TIFR, Ooty, India) for constructive discussions and the referee for his comments. The authors gratefully acknowledge the data support provided by various online data centers of NOAA and NASA. We would like to thank the Wind/WAVES team for providing the type II catalogs. The CME catalog we have used is provided by the Center for Solar Physics and Space Weather, The Catholic University of America in cooperation with the Naval Research Laboratory and NASA. Also we thank the umbra and NASCOM team for providing Solar Energetic particle data. The major research grant No. 42-845/2013 (SR) to A.S. from University Grants Commission, Govt. of India is kindly acknowledged.

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  1. Arul Anandar College, Karumathur, 625 514, Madurai Dist., India

    A. Shanmugaraju

  2. M.K. University College, Aundipatti, Theni Dist., India

    S. Prasanna Subramanian

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  1. A. Shanmugaraju
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  2. S. Prasanna Subramanian
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Correspondence to S. Prasanna Subramanian.

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Shanmugaraju, A., Prasanna Subramanian, S. Interacting CMEs and their associated flare and SEP activities. Astrophys Space Sci 352, 385–393 (2014). https://doi.org/10.1007/s10509-014-1956-1

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  • DOI: https://doi.org/10.1007/s10509-014-1956-1

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