nouveau bandeau du PNST 2022

Observing delayed emissions of Interplanetary Type III bursts during the comissioning phase of Solar Orbiter
David Paipa  1@  , Nicole Vilmer  2  , Milan Maksimovic  2  
1 : Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
Observatoire de Paris
2 : Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
Observatoire de Paris, Centre National de la Recherche Scientifique

The Sun is a magnetic and active star as well as an efficient particle accelerator. Particle acceleration and transport in the corona and in the heliosphere is an important and challenging topic, not only from the point of view of understanding fundamental processes in our star but also from the point of view of understanding and potentially forecasting the effects of solar energetic particles on the terrestrial environment (space weather applications). The most direct diagnostics of energetic electrons in the solar atmosphere are the X-ray and radio emissions they produce. The launch of the Solar Orbiter in early 2020 marked a significant milestone, as it equipped us with the capability to simultaneously capture both types of emissions. This unique vantage point enables us to investigate the acceleration mechanisms of energetic electrons during solar flares, their subsequent transport, and radiative processes as they propagate from the corona into the interplanetary medium. Our study focuses on 16 Interplanetary Type III radio bursts (IT3s) associated with HXR emission peaks, observed by the instruments RPW and STIX during the commissioning phase of the Solar Orbiter mission from November 17 to 21, 2020. We have observed changes in the X-ray source morphology coinciding with the occurrence of IT3 emissions, and our combined observations with the EUI instrument suggest the presence of open magnetic field lines within the active region, which could potentially enhance IT3 production.

 


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