Astrophysics and Space Science

, Volume 350, Issue 1, pp 33–45 | Cite as

Geoeffectiveness and flare properties of radio-loud CMEs

  • O. Prakash
  • A. Shanmugaraju
  • G. Michalek
  • S. Umapathy
Original Article
First Online:
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Accepted:

Abstract

A detailed investigation on geoeffective CMEs associated with meter to Deca-Hectometer (herein after m- and DH-type-II) wavelengths range type-II radio bursts observed during the period 1997–2005 is presented. The study consists of three steps: i) the characteristics of m-and DH-type-II bursts associated with flares and geoeffective CMEs; ii) characteristics of geo and non-geoeffective radio-loud and quiet CMEs, iii) the relationships between the geoeffective CMEs and flares properties. Interestingly, we found that 92 % of DH-type-II bursts are extension of m-type-II burst which are associated with faster and wider geoeffective DH-CMEs and also associated with longer/stronger flares. The geoeffective CME-associated m-type-II bursts have higher starting frequency, lower ending frequency and larger bandwidth compared to the general population of m-type-II bursts. The geoeffective CME-associated DH-type-II bursts have longer duration (P≪1 %), lower ending frequency (P=2 %) and lower drift rates (P=2 %) than that of DH-type-IIs associated with non-geoeffective CMEs. The differences in mean speed of geoeffective DH-CMEs and non-geoeffective DH-CMEs (1327 km s−1 and 1191 km s−1, respectively) is statistically insignificant (P=20 %).However, the mean difference in width (339∘ and 251∘, respectively) is high statistical significant (P=0.8 %). The geo-effective general populations of LASCO CMEs speeds (545 km s−1 and 450 km s−1, respectively) and widths (252∘ and 60∘, respectively) is higher than the non geo-effective general populations of LASCO CMEs (P=3 % and P=0.02 %, respectively). The geoeffective CMEs associated flares have longer duration, and strong flares than non-geoeffective DH-CMEs associated flares (P=0.8 % and P=1 %, respectively). We have found a good correlation between the geo-effective flare and DH-CMEs properties: i) CMEs speed—acceleration (R=−0.78, where R is a linear correlation coefficient), ii) acceleration—flare peak flux (R=−0.73) and, iii) acceleration—Dst index intensity (R=0.75). The radio-rich CMEs (DH-CMEs) produced more energetic storm than the radio-quiet CMEs (general populations of LASCO CMEs). The above results indicate that the DH-type-II bursts tend to be related with flares and geoeffective CMEs, although there is no physical explanation for the result. If the DH-type-II burst is a continuation of m-type-II burst, it could be a good indicator of geoeffective storms, which has important implications for space weather studies.

Keywords

Coronal mass ejections Type-II bursts, geoeffective radio-loud CMEs 
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Notes

Acknowledgements

The authors greatly acknowledge the data support provided by various online data centers of NOAA and NASA. We would like to thank the Wind/WAVES and ground based radio spectrograph teams for providing the type-II data in online catalogs. This 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 author O. P. thanks to Vaigai College of Engineering from India for providing infrastructure and lab facilities for research. The major research grants UGC MRP No. 42-845/2013 (SR) from University Grants Commission, India to the author A.S. is kindly acknowledged.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • O. Prakash
    • 1
  • A. Shanmugaraju
    • 2
  • G. Michalek
    • 3
  • S. Umapathy
    • 4
  1. 1.Department of PhysicsVaigai College of EngineeringMaduraiIndia
  2. 2.Department of PhysicsArul Anandar CollegeMaduraiIndia
  3. 3.Astronomical Observatory of Jagiellonian UniversityKrakowPoland
  4. 4.School of PhysicsMadurai Kamaraj UniversityMaduraiIndia

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