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Kinematics and Flare Properties of Radio-Loud CMEs

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Abstract

A detailed analysis of the characteristics of coronal mass ejections (CMEs) and flares associated with decameter-hectometer wavelength type-II radio bursts (hereafter DH-type-II radio bursts, DH-CMEs or radio-loud CMEs) observed in the period 1997 – 2008 is presented. A sample of 61 limb events is divided into two populations based on the residual acceleration: accelerating CMEs (a r>0) and decelerating CMEs (a r<0). We found that average speed (residual acceleration) of all limb DH-CMEs (called radio-loud CMEs) is nearly three (two) times greater than the average speed of the general population CMEs (radio-quiet CMEs). While the initial acceleration (a i) of the accelerating DH-CMEs is smaller than that of decelerating DH-CMEs (0.79 and 1.62 km s−2, respectively), the average speed and magnitude of residual acceleration of the accelerating and decelerating DH-CMEs are similar (〈V CME〉: 1254 km s−1 and 1303 km s−1; 〈a r〉: 0.026 km s−2 and 0.028 km s−2, respectively). The accelerating DH-CMEs attain their peak speed at larger heights than decelerating DH-CMEs. A good positive and negative linear correlation for accelerating and decelerating DH-CMEs (R a=0.74 and R d=−0.77, respectively) is found. The flares associated with accelerating DH-CME events have longer rise times and decay times than flares of decelerating DH-CME. The accelerating and decelerating DH-CMEs events associated with DH-type-II bursts have similar ending frequencies. The analysis of time lags between DH-type-II start and the flare onset shows that the delays are longer in accelerating DH-CMEs than decelerating DH-CMEs (P∼7 %). However, the time lags between the DH-type-II start and the CMEs onset are similar.

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Notes

  1. http://cdaw.gsfc.nasa.gov/waves/typeII00.html .

  2. http://cdaw.gsfc.nasa.gov/CME_list .

  3. ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SOLAR_FLARES/FLARES_XRAY .

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Acknowledgements

We thank Dr. Nat. Gopalswamy for his critical comments, which helped us to improve the presentation of the paper. 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 an online type-II catalog. The SOHO/LASCO CME catalog is generated and maintained at the CDAW Data Center by NASA and The Catholic University of America in cooperation with the Naval Research Laboratory. SOHO is a project of international cooperation between ESA and NASA. One of the authors (O.P.) thanks the University Grant Commission from India for providing the UGC-Meritorious fellowship.

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Authors and Affiliations

  1. School of Physics, Madurai Kamaraj University, Madurai, 625021, Tamil Nadu, India

    O. Prakash, S. Umapathy & V. Vasanth

  2. Department of Physics, Arul Anandar College, Karumathur, Madurai, 625514, Tamil Nadu, India

    A. Shanmugaraju

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  1. O. Prakash
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Correspondence to O. Prakash.

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Prakash, O., Umapathy, S., Shanmugaraju, A. et al. Kinematics and Flare Properties of Radio-Loud CMEs. Sol Phys 281, 765–777 (2012). https://doi.org/10.1007/s11207-012-0111-9

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