Relation between coronal mass ejections and sunspot number during solar cycle 24

In this paper, we report on the statistical relationships between coronal mass ejections (CMEs) and sunspot number (SSN) that were suggested during 2008-2017 for solar cycle 24. We used SSN from Sunspot Index and Long-term Solar Observations and CMEs observed by the Large Angle and Spectrometric Coronagraph on board the Solar and Heliospheric Observatory mission. The annual time of the years (2008-2017) of solar cycle 24 was adopted to conduct the investigation and obtain the mutual correlation between SSN and CMEs. The relationship between CME rates, halo speed, and partial halo CMEs for solar cycle 24 was studied. The analysis of results indicated that the average speed of halo CMEs is almost faster than the average speed of partial halo CMEs. The maximum average speed of halo CMEs was found to be as high as 1487.9 km/sec in 2017, while the minimum speed of halo CMEs in 2008 was 47 km/sec. CMEs are principally from sunspot regions. Test results of the annual correlation between SSN and CMEs are simple and can be represented by a linear regression equation. (author)