Nils Janitzek

Internal Research Fellow in the Solar Orbiter Group at ESAC

 

Main Research Fields

I am investigating kinetic processes of heliospheric ion populations using in-situ particle measurements over a wide energy range from solar wind to solar energetic particles.

During my PhD, I studied nonthermal signatures of heavy ion velocity distributions in the undisturbed solar wind that provide unique information on solar wind acceleration, heating, transport and thermalization.

My current work at ESA aims to improve our understanding of ion acceleration at heliospheric shocks driven by coronal mass ejections (CMEs) and corotating interaction regions (CIRs). The recently launched Solar Orbiter mission will make unprecedented measurements of heavy ions in the inner heliosphere by approachng the Sun as close as 0.3 AU. At such small solar distances we expect to observe the shock acceleration of solar particles “at work”, so that one can relate the local shock properties to the kinetic signatures of the accelerated particle populations. These studies will provide us with deeper insights into ion shock acceleration throughout the universe but also aim to enable a better estimate of the space weather impact of CIR and CME related shocks, potentially allowing more accurate forecasts at Earth.

 


Keywords

 

Space Plasma In-Situ Measurements
Solar Wind
Solar Energetic Particles
Space Weather

 

Ongoing collaborations

 

- Lars Berger, Verena Heidrich-Meisner, Robert Wimmer-Schweingruber, University of Kiel, Kiel, Germany

- Fernando Carcaboso Morales, Raúl Gómez-Herrero, Javier Rodriguez-Pacheco, University of Alcalá, Alcalá de Henares, Spain

- Zdenek Nemecek, Jana Safrankova, Charles University, Prague, Chech Republik

 

Publications

 

Refereed papers :

Nemecek, Z., Durovcova, T., Safrankova, J., Matteini, L., Stansby, D., Janitzek,
N. P., Berger, L., Wimmer-Schweingruber, R. F. What is the solar wind frame
of reference, The Astrophysical Journal, 889:163 (2020), https://doi.org/10.3847/1538-4357/ab65f7

Janitzek, N. P., Berger, L., Taut, A., Bochsler, P., Klecker, B., and Wimmer-
Schweingruber, R. F., 2016, High time-resolution measurements of solar wind
heavy ions with SOHO/CELIAS/CTOF, AIP Conference Proceedings 1720,
040006 (2016); DOI: 10.1063/1.4943817

Strugarek, A., Janitzek, N. P., Lee, A., et al.,  2015, A space weather mission concept: observatories
of the solar corona and active regions (OSCAR), Journal of Space Weather Space Climate.,
5, A4 (2015), DOI: 10.1051/swcs/2015003

 

Papers in preparation :

Janitzek, N. P., Berger, L., Taut, A., Bochsler, P., Klecker, B., and Wimmer-
Schweingruber, R. F., Differential streaming and kinetic temperatures of solar wind heavy ions measured with SOHO/
CELIAS/CTOF, (to be submitted to Astronomy & Astrophysics in fall 2020),

 

Janitzek, N. P., Berger, L., Wimmer-Schweingruber, R. F., “An improved instrumental response model for spaceborne

time-of-flight mass spectrometers”, to be submitted to Astronomy & Astrophysics in fall 2020)

 

Project/mission at ESA

 

Solar Orbiter