Space Missions

I am a Co-Investigator for the Solar Wind Plasma Analyser (SWA) instrument on board ESA’s Solar Orbiter spacecraft. Solar Orbiter launched in February 2020 and explores the inner heliosphere and its connection with the Sun in great detail. The SWA instrument suite measures the in-situ properties of protons, electrons, alpha particles, and heavy ions with unprecedented resolution and quality. Here is some of the media coverage that the launch of Solar Orbiter generated with my involvement:

I have written a News & Views feature article “A step closer to the Sun’s secrets” for Nature about the first results from the Parker Solar Probe. This mission was launched in the summer of 2018 and has now reached the inner parts of the solar system. No spacecraft has explored these regions before. The initial results are promising and show that the solar wind is more structured than previously expected and that the amplitude of fluctuations is greater near the Sun. You can read my Nature article and the related research articles here. There is even a Japanese version of my article. I have also written a summary piece for The Conversation and was interviewed about the Parker Solar Probe results by the Cosmos Magazine and the New York Times. Another summary article can be found on

I am the Mission Co-PI Science for the Debye mission. This mission concept is currently under review for ESA’s F-class programme. If selected, Debye will answer the science question “How are electrons heated in astrophysical plasmas?”. It will consist of one main spacecraft that measures electrons with very high cadence and resolution, electric fields, magnetic fields, and protons. Then it will have a smaller deployable spacecraft that measures high-frequency fluctuations in the electric and magnetic fields. The spacecraft separation will vary from a few hundred metres to a few tens of kilometres during the mission lifetime. In this way, Debye will study the thermodynamics of electrons on small plasma scales in the solar wind. The major challenge for these measurements lies in the requirement to count electrons very rapidly in order to resolve electron-scale structures in the particle distribution. Debye also features in my AGU Narratives podcast interview for the American Geophysical Union’s centennial and the Space Mission Special on BBC Four’s Sky at Night programme.
In relation to our Debye mission proposal, we have submitted the White Paper “A Case for Electron-Astrophysics” to ESA’s Voyage 2050 programme. In this White Paper, we argue for the importance of electron-scale physics to understand the global plasma evolution in the solar wind and throughout the Universe.

Credit: HelioSwarm Team I’m a member of the Theory Working Group for the NASA mission HelioSwarm. This mission was selected by NASA in February 2022. As a swarm of nine spacecraft, HelioSwarm will measure the turbulence in the solar wind. Using multiple measurement points, this mission will give us novel simultaneous measurements of different scales of the turbulent fluctuations. HelioSwarm is a MIDEX mission planned to launch in 2028.

MagneToRE spacecraft. Credit: Maruca et al. (2021)I’m a member of the science teams for the new mission concepts MagneToRE and HelioDISC. MagneToRE is the “Magnetic Topology Reconstruction Explorer”, a constellation of more than 20 small satellites that will measure structures in the meso-scale interplanetary magnetic field. This mission will create the first images of the magnetic field in space.
HelioDISC is the “Heliospheric Distributed In-situ Constellation”. This mission consists of four spacecraft that will slowly increase their separation over time. This will allow us to measure meso-scale and large-scale structures in the solar wind, including coronal mass ejections and their impact on energetic particles.