Effect of the Solar Cycle on Typical CME Properties During 1995-2023.

Authors: Nada AlHadda (Space Science Center and Department of Physics, University of New Hampshaire, Durham, NH 03284, USA; ts1090@wildcats.unh.edu), Yakub Olufadi(Space Science Center and Department of Physics, University of New Hampshaire, Durham, NH 03284, USA; ts1090@wildcats.unh.edu), Florian Regnault (Space Science Center and Department of Physics, University of New Hampshaire, Durham, NH 03284, USA; ts1090@wildcats.unh.edu),

Coronal Mass Ejections (CMEs) are violent events corresponding to strong magnetic structures erupting from the outermost part of the Sun: the corona. CMEs observed in the interplanetary medium have been cataloged in the Helio4Cast catalog that covers more than 2 decades of in situ measurements (1995- 2023) and includes measurements made by 9 interplanetary probes. Starting from over 1000 CMEs, we use the statistical approach known as the superposed epoch analysis to determine the mean and median in situ profiles of CMEs emit- ted during the active phase and the quiet phase of the solar cycle. We define the quiet and the active phase of the solar cycle by using a threshold on the sunspot number (SSN) . The active phase events results in a greater increase of magnetic field strength, and other plasma parameters of a over the CMEs emitted during the quiet phase. Changing the threshold for defining the quiet and active phase events by setting the SSN as 30 for QP and 70 for AP, both categories had the same amount of events. we find similar structural behavior except for the plasma density which distinctly differs. With further investigation, we intend to observe the typical properties of CMEs by classifying them as with or with shock, with or without magnetic cloud signatures. We will observe CMEs at various positions from the Sun, perform SEA on minimum variance analysis of CMEs.