An assessment of potentially space weather causing CMEs through analysis of associated interplanetary type II solar radio bursts and solar energetic particle events

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Abstract We report on the results of a study conducted to analyze and characterize the space weather consequences of CMEs as inferred from the associated interplanetary (IP) type II Solar Radio Bursts (SRBs) during part of solar cycle (SC) 24. A sample of 39 metric type II bursts with Decametric-Hectometric (DH) counterpart was analyzed. The properties of SRBs are divided in three groups: all metric type II bursts with DH counterparts (m-DH), m-DH accompanied by a Solar Energetic Particle (SEP) event (m-DH-SEP), and m-DH not accompanied by SEP events (m-DH-NonSEP) were compared and the results are presented. We analysed the CME parameters such as widths, speeds and residual accelerations for the three groups. Among 39 m-DH type II bursts analysed in this study, 21 (54%) are accompanied by SEP events. The average CME speed of m-DH SEP-accompanied events (1198 km/s) is higher than both the m-DH non-SEP events (722 km/s) and all m-DH events (978 km/s). We found that the fraction of halos increases in the order of (i) m-DH-SEP (90.5%), (ii) m-DH (74.3%) and (iii) m-DH-NonSEP (55.6%). The sky-plane speed of CMEs and logarithmic peak intensity of SEP events are highly correlated (Pearson’s correlation coefficient cc = 0.802 with a standard error of SE cc = 0.137). Among 21 m-DH-SEP events, 15 originated from the western longitude and this is consistent with their solar source connected to the observer near Earth, hence a significant space weather implication. In general, the obtained results confirm previous findings that fast and wide (FW) CMEs are effective in accelerating energetic particles and DH type II bursts are good indicators of such events.

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