Deshpande, Ketaki ; Magdalenic, Jasmina ; Jebaraj, Immanuel Christopher ; Valliappan, Senthamizh Pavai ; Krupar, Vratislav

Talk presented at Triennial Earth-Sun Summit 2024, Dallas, Texas on 2024-04-12

Abstract: Accurate modeling of the solar wind plasma properties is crucial also for good modeling of the solar transients like coronal mass ejections (CMEs). Solar transients are often associated with radio emissions that can provide the insights into coronal plasma characteristics. Up to recently, the validation of these radio observations was not possible due to the absence of in situ data at various distances from the Sun. Presently, the Parker Solar Probe (PSP) provides unprecedented opportunities to explore coronal plasma characteristics near the Sun. In conjunction with PSP observations, we leverage the advanced space weather modelling tool EUHFORIA (EUropean Heliospheric FORecasting Information Asset) to validate the results derived from radio bursts. This study centers on the estimation of the solar wind plasma density using the so-called type III radio bursts observed during the second PSP perihelion. Type III bursts are radio signatures of fast electron beams which travel along open or quasi-open magnetic field lines and map along their way the solar wind plasma characteristics. In order to estimate the solar wind density pro>les along the propagation path of the type III bursts we employed direction-finding observations from STEREO and Wind spacecrafts and the radio triangulation method. The 3D radio source positions of type III bursts allowed us to estimate the solar wind density profiles. These radio-derived densities were compared with the solar wind density time series obtained with EUHFORIA model and with in situ density measurements from the PSP. We first compared modeling results of EUHFORIA at the PSP position and the density measured by the PSP. After fine tuning the EUHFORIA output, which was done in order to obtain accurate modeled solar wind at the PSP positions, we modeled solar wind at the positions of the radio sources. Our preliminary findings show that the electron densities derived from the radio observations are somewhat larger than the one measured by the PSP and modelled by EUHFORIA.

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Funding: 3BOURSE_DESHPANDE/3BOURSE_DESHPANDE/3BOURSE_DESHPANDE