Abstract Details
| Name: Raj Kumar Affiliation: Kumaun University Nainital Conference ID: ASI2025_291 Title : Study of Solar Energetic Particles, their Source Regions and Associated CMEs during Solar Cycle 23-24 Authors and Co-Authors : Raj Kumar1, Ramesh Chandra1, Bimal Pande1, Seema Pande1 Abstract Type : Poster Abstract Category : Sun, Solar System, Exoplanets, and Astrobiology Abstract : We present here a study of association of solar active regions with 152 solar energetic particle events (SEPs), Coronal mass ejections (CMEs) and solar flares for the solar cycles (SCs) 23-24 (1997 - 2017). For our study, we have used the GOES data available online at Coordinated Data Analysis Workshops (CDAW) center in the energy channel > 10 MeV having flux ≥ 10 pfu. For the associated activities, we have analyzed the data from SOHO/LASCO. We found a moderate correlation (55%) between SXR flux and sunspot area. A weak correlation (46%) was found between SEP intensity and SXR flux and correlation of SEP intensity with different classes of SXR flares was found to be increased from weak (C-class) to strong (X-class) flares. 80% of the SEP events are originated from western hemisphere and 20% from eastern hemisphere. We found that most of the SEPs are originated from the magnetically complex active regions i.e., hale class βγδ and β. Very few events were associated with unipolar active regions. We found that maximum average SEP intensity (2051 pfu) was found corresponding to active region βγδ. In the data set used, we found only 10% SEPs impulsive in nature, while the remaining 90% are gradual in nature. All the impulsive SEP events were originated from western hemisphere. All the impulsive events had SEP intensity less than 100 pfu and most of the CMEs associated with these events were decelerated CMEs. |