Research & Publications

Research Interests

I am a space plasma physicist with a focus on how the solar wind and its large-scale structures—such as coronal mass ejections, high-speed streams, and stream interaction regions—shape the near-Earth environment. My research explores the formation and properties of dynamic pressure enhancements ("jets") in the magnetosheath, the region just outside Earth's magnetic field, and how these processes link solar, magnetospheric, and space weather phenomena. I am also interested in stellar activity, the impact of solar events on satellites, and the broader connections between astrophysical plasma processes and our technological society.

I am part of the Space Plasma Group at Queen Mary University of London.

Talk at "Heliophysics in Europe" Workshop
ESA / ESTEC

Selected Publications

• Koller, F., Raptis, S., Temmer, M., Karlsson, T. (2024). The Effect of Fast Solar Wind on Ion Distribution Downstream of Earth’s Bow Shock. The Astrophysical Journal Letters, 964, L5. doi:10.3847/2041-8213/ad2ddf
• Koller, F., Plaschke, F., Temmer, M., Preisser, L., Roberts, O., Vörös, Z. (2023). Magnetosheath Jet Formation influenced by Parameters in Solar Wind Structures. Journal of Geophysical Research: Space Physics, 128. doi:10.1029/2023JA031339
• Koller, F., Temmer, M., Preisser, L., Plaschke, F., Geyer, P., Jian, L. K., et al. (2022). Magnetosheath jet occurrence rate in relation to CMEs and SIRs. Journal of Geophysical Research: Space Physics, 127. doi:10.1029/2021JA030124
• Koller F., Leitzinger M., Temmer M., Odert P., Beck P. G., Veronig A. (2021). A search for flares and associated CMEs on late-type main-sequence stars in optical SDSS spectra. Astronomy & Astrophysics, 646 A34. doi:10.1051/0004-6361/202039003
• Krämer, E., Koller, F., Suni, J., LaMoury, A. T., et al. (2025). Jets Downstream of Collisionless Shocks: Recent Discoveries and Challenges. Space Science Reviews, 221, 4. doi:10.1007/s11214-024-01129-3
• Temmer, M., Dumbović, M., Martinić, K., et al., Koller, F. (2025). Comparative analysis of two episodes of strongly geoeffective coronal mass ejection events in November and December 2023. A&A, 695 A58. doi:10.1051/0004-6361/202451479
• Pöppelwerth, A., Glebe, G., Mieth, J. Z. D., Koller, F., et al. (2024). Scale size estimation and flow pattern recognition around a magnetosheath jet. Annales Geophysicae, 42. doi:10.5194/angeo-42-271-2024
• Pöppelwerth, A., Koller, F., Grimmich, N., et al. (2024). Cluster: List of plasma jets in the subsolar magnetosheath. Frontiers in Astronomy and Space Sciences, 11. doi:10.3389/fspas.2024.1388307
• Vuorinen, L., LaMoury, A. T., Hietala, H., & Koller, F. (2023). Magnetosheath jets over solar cycle 24: An empirical model. Journal of Geophysical Research: Space Physics, 128. doi:10.1029/2023JA031493
• Leitzinger, M., Odert, P., Greimel, R., Vida, K., Kriskovics, L., Guenther, E. W., Korhonen, H., Koller, F., et al. (2020). A census of coronal mass ejections on solar-like stars. Monthly Notices of the Royal Astronomical Society, 493, 4570-4589.

My ORCID profile: https://orcid.org/0000-0002-8164-0004

Talks and Poster Presentations (Selection)

See my Google Scholar profile for a full overview of my papers and abstracts.

• 2024: Solar wind structures impacting the plasma stability and ion energy distribution downstream of the terrestrial bow shock. Oral Presentation, EGU 2024, Vienna.
• 2023: Connecting Solar Wind Structures with the terrestrial Magnetosheath: Jet Occurrence and Plasma Stability. Oral Presentation, Heliophysics in Europe Workshop, ESTEC, The Netherlands.
• Investigating Plasma Stability within Solar Wind Structures & Jets in the dayside terrestrial Magnetosheath. Oral Presentation, THEMIS-ARTEMIS Post-AGU Fall Meeting 2023, online, San Francisco.
• Modification of magnetosheath jet occurrence and properties within CMEs and SIRs. Oral Presentation, EGU 2023, Vienna.
• 2022: Solar wind conditions suppressing the production of magnetosheath jets during CME occurrence. Oral Presentation, EGU 2022, Vienna.
• How properties of large-scale solar wind structures drive magnetosheath jet properties. Oral presentation, COSPAR 2022, Athens.
• Stellar CME search using large datasets: Balmer line asymmetries in optical SDSS spectra. Oral presentation, COSPAR 2022, Athens.
• Investigating residual Magnetosheath Jets during Coronal Mass Ejections. Poster presentation, European Space Weather Week 2022, Zagreb.
• Connecting Magnetosheath Jets to large-scale Solar Wind Structures. Oral Presentation, THEMIS-ARTEMIS Post-AGU Fall Meeting 2022, online, Chicago.
• 2021: Searching for flares and associated CMEs on cool stars using Balmer lines in SDSS spectra. Talk at AGU Fall Meeting 2021, online.
• On the influence of CMEs and SIRs on the generation of magnetosheath jets. Poster at AGU Fall Meeting 2021, online.
• Characteristics of magnetosheath jets during a CME passage. Poster at AGU Fall Meeting 2021, online.
• First results on production of magnetosheath jets during SIRs and CMEs. European Solar Physics Meeting ESPM-16 2021, online.
• 2019: Stellar CMEs from an observational point of view. EGU 2019, Vienna.