Energetic particles from the Sun to stars

Topic: Solar Physics

Session Title: Energetic particles from the Sun to stars


High-energy particles and related non-thermal electromagnetic radiation are essential components of solar activity. Energetic particles are responsible for the fast energy transfer during solar flares in the solar corona and in the heliosphere, and serve as an important link between the Sun and Earth, significantly influencing space weather.

Our understanding of energetic particles at the Sun has advanced significantly over the past two decades, thanks to the RHESSI mission revealing how energetic particles get accelerated and scattered in the inner solar atmosphere. More recently, remote and in situ observations with Solar Orbiter (SolO) and Parker Solar Probe (PSP), as well as low-frequency radio observations with LOFAR have provided unique information about propagation of energetic particles and non-thermal radiation in the upper atmosphere of the Sun and the inner heliosphere. These new results are essential to solving the long-standing problem of energetic particles at the Sun. Moreover, they may provide a key to similar phenomena in deeper space, such as flares in the atmospheres of young stellar objects and interacting binary stars.

In this session, we will review recent remote and in situ observations of non-thermal plasma in the solar corona and inner heliosphere using a combination of data from SolO, PSP, LOFAR, and other facilities. We discuss how these observational data can constrain theoretical models of particle acceleration and transport in solar and stellar flares, and how they can be used to model and forecast energetic particle events in the heliosphere.

Organiser(s): Mykola Gordovskyy (Hertfordshire), Timo Laitinen (Central Lancashire) and Jan Forbrich (Hertfordshire)


Session 1: Thursday 18th July, 09:00 – 11:00