| Abstract : | The comparative increase in spotless days (SLD) is observed since from the cycle 21. Cycle 24 has highest SLDs (since from cycle 14) hence it is one of the weakest cycles. The SLDs are proven to be a potential candidate for forecasting the preceding solar cycle. Similarly magnetic helicity [ejected as Coronal Mass Ejection (CME)] can also use to predict next solar cycle. In this regard, we investigate the properties of the CME that occurred on the SLD during the descending phases of solar cycles 23 (2004-2008) and 24 (2015-2019). CMEs on SLD are observed to be 14 and 11% (occurrence frequency of 1.55 and 1.06/SLD) w.r.t. to the total CMEs that occurred in the aforementioned duration, respectively. Evidently, a significant fraction of the CME activity on the SLDs implies that sunspot number is not a good proxy of the CMEs. We emphasize that increased number of CME after 2004 is due to the contribution of the CMEs ejected from the non-active region. The front side CME on SLD (CMESLD) were slower, smaller in width, carries low K.E. and mass. Even though the few CME contributes to produce minor geomagnetic storms. A comparative analysis of CMESLD kinematics of cycle 23 and 24 shows that the cycle 24 has wider and massive events. |
