Austrian Early Career Conference 2024

Contribution:
Poster

Authors:
Philippe-A. Bourdin

Affiliations:
Institute of Physics, University of Graz

Title:
Electro-Motive Force in Heliospheric Magnetic Clouds

Abstract:
We use the electro-motive force to analyze the turbulence and dynamo action within or in front of shock waves passing the heliosphere. This requires us to take magnetic-field measurements, as well as plasma-velocity measurements from the solar wind, which we obtain from SolarOrbiter data. Typical events to analyze are of course inter-planetary coronal mass ejections that ultimately originate from energetic outbreaks on the Sun. Since SolarOrbiter flies within the Earth orbit at or below about 1 au, we obtain insights in regions where no stationary observatories are available and where such magnetic events have not yet interacted with any obstacle like a planetary megnetospehre. Our goal is to understand better how magnetic field might get amplified, how turbulence or reconnection slows down the propagation of these shoch fronts in inter-planetary space, and which component of the electro-motive force is a key her to cause dynamo action. Our first results indicate also that we may infer the magnetic helicity orientation from in-situ measurements in the inner heliosphere.