000007518 001__ 7518
000007518 005__ 20250204104439.0
000007518 037__ $$aPOSTER-2025-0036
000007518 100__ $$aValliappan, Senthamizh Pavai
000007518 245__ $$aEffects of changing source surface height parameter in solar wind simulations using EUHFORIA
000007518 260__ $$c2024
000007518 269__ $$c2024-11-05
000007518 520__ $$aThe solar wind modelling study using the 3D MHD model EUHFORIA (EUropean Heliospheric FORecasting Information Asset, Pomoell & Poedts, 2018) at near the Sun distances show a large discrepancy between modelling results and in situ observations by Parker Solar Probe (PSP). The default coronal model used in EUHFORIA consists of the potential field source surface extrapolation (PFSS), Schatten current sheet (SCS) model and semi-empirical WSA  model, which simulate the plasma and magnetic conditions at the inner boundary (0.1 AU). The outer boundary of the PFSS model, known as the source surface height parameter (RSS), and the inner boundary of the SCS model are among the free parameters in the coronal model that determine the area of modelled coronal holes, which in turn influences the area of open flux. In EUHFORIA, a default value of RSS = 2.6 R⊙ as suggested by McGregor et al. (2008) is used in the solar wind modelling at short radial distances. It is reported that lower RSS value in coronal models better captures the area of coronal holes (Asvestari et al., 2019), reconstructs small-scale features (Badman et. al., 2020), and represents coronal magnetic field topologies during different phases of solar cycles (Lee et al. 2011; Arden et al. 2014). In this study, we employ different values for the outer boundary of the PFSS model and inner boundary of the SCS model, while keeping default values for other parameters. We then compare the solar wind modelling results with varying RSS parameters to those obtained using all default parameters in the coronal model, by evaluating their agreement with the in situ observations from PSP for its first ten perihelion encounters.
000007518 536__ $$a2INFRA_FED_SUNRISE/$$c2INFRA_FED_SUNRISE/$$f2INFRA_FED_SUNRISE
000007518 594__ $$aNO
000007518 700__ $$aMagdalenic, Jasmina
000007518 773__ $$tESWW, Coimbra, Portugal
000007518 8560_ $$fpavai.valliappan@ksb-orb.be
000007518 980__ $$aCPOSTER