A comparison of Solar Cycle 23rd and 24th for Solar type II radio bursts associated with coronal mass ejection in relation to interplanetary features

We investigate the association of flare-CME events accompanied with DH type II radio bursts with interplanetary features such as magnetic field (IMF, B), geomagnetic storms (GSs), and cosmic ray intensity (CRI) from 2008 to 2019, covering the whole Solar Cycle 24th and compared this study with our previous study for the same in Solar Cycle 23rd (Chandra and Bhatt 2018). We have divided our selected data into two groups: in the first group, we have 6 events that lie under the CME span, and in the second group, 40 events that lie outside the CME span. In Solar Cycle 23rd, we considered a total of 114 events, out of which 43 were lying under the CME span and 71 were lying outside the CME span. We observed that activity in Solar Cycle 24th is less than in Solar Cycle 23rd. We observed that flare-CME accompanied with DH type II radio burst is inconsistent with CSHKP flare-CME and it agrees with our previous result for Solar Cycle 23rd. Applying the Chree analysis by the superposed epoch method, we found that under the CME span events, the maximum increase in IMF occurred one day before the events that occurred outside the CME span. Further, in Solar Cycle 24th, we observed that events in which flares lie outside the CME span are more geoeffective, whereas, in Solar Cycle 23rd, events in which flares lie under the CME span are more geoeffective. Thus, flare position with respect to the CME span plays a key role in the geo-effectiveness of the CME.