| Name: | sindhuja gunaseelan |
| Affiliation: | Christian Albrechts University |
| Conference ID: | ASI2025_200 |
| Title: | Comparative Study of Helium-Rich and Helium-poor Events Observed by the High-Energy Telescope (HET) Onboard Solar Orbiter |
| Authors: | Sindhuja. G 1, Robert F. Schweingruber 1, Patrick Kühl 1, Alexander Kollhoff 1, Sebastian Fleth 1, Lars Berger 1 , Zheyi Ding 1, Javier Rodriguez-Pacheco 2, George C. Ho 3, Glenn M. Mason 4, Raul Gomez-Herrero 2, Francisco Espinosa Lara 2, Ignacio Cernuda 2, Stephan Böttcher 1, Sandra Eldrum 1, and Robert C. Allen 3 |
| Authors Affiliation: | 1 Institute of Experimental and Applied Physics, Kiel University, Leibnizstabe 11, DE-24118 Kiel.
2 Universidad de Alcalá, Space Research Group, 28805 Alcalá de Henares, Spain
3 Southwest Research Institute, San Antonio, TX, USA
4 Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
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| Mode of Presentation: | Oral |
| Abstract Category: | Sun, Solar System, Exoplanets, and Astrobiology |
| Abstract: | The High-Energy Telescope (HET) onboard the Solar Orbiter mission measures the energy spectra of energetic particles, including helium and protons, in the inner heliosphere. We present a comparative analysis of 7 helium-rich events and 5 helium-poor events observed by HET from July 2020 to October 2024, spanning multiple solar rotations and a variety of solar wind conditions. Helium-rich events are particularly significant as they provide insights into the mechanisms of particle acceleration and transport associated with solar flares and coronal mass ejections (CMEs).
The HET instrument, designed to analyze energetic particles in the solar wind, operates in an energy range of ~7 - 500 MeV/nucleon (species dependent). Our analysis aims to elucidate differences in energy spectra and particle composition between helium-rich and non-helium-rich events, thus shedding light on the underlying physical processes governing these phenomena. The Solar Orbiter's unique orbit, with a perihelion of approximately 0.28 AU (42 million kilometers) from the Sun, allows for unprecedented examination of particles accelerated by solar eruptions.
Additionally, we present the kinematics of the associated CMEs and flare properties. Our study is expected to enhance understanding of the role of helium-rich events in the solar wind and their potential impacts on Earth's magnetosphere, contributing significantly to the broader comprehension of heliospheric dynamics.
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