5 papers
Observations of stable pickup He tori in a magnetic flux rope at 0.85 au
Chaoran Gu, Lars Berger, Verena Heidrich-Meisner +3
Interstellar pickup ions originate from the neutral interstellar medium, are ionized in the heliosphere, and picked up by the solar wind. They initially form a torus-shaped velocit…
Anomalous cosmic rays within the inner heliosphere: Observations of helium by the High Energy Telescope onboard Solar Orbiter
Zigong Xu, Robert F. Wimmer-Schweingruber, Lars Berger +11
Radial gradients of cosmic rays are key parameters for understanding the transport of particles in space. Solar Orbiter, launched on 2020 February 10, approaches the Sun approximat…
Bidirectional anisotropic solar energetic particle events observed by Solar Orbiter
Zheyi Ding, Robert F. Wimmer-Schweingruber, Yu Chen +12
Solar Energetic Particle (SEP) events are critical for understanding particle acceleration and transport in the heliosphere. While most SEP events involve outward streaming particl…
Three dimensional He+ pickup ion velocity distribution functions observed with STEREO-A PLASTIC
Duncan Keilbach, Verena Heidrich-Meisner, Lars Berger +1
Freshly injected interstellar Pickup Ions (PUIs) are expected to exhibit a simple, torus-shaped velocity distribution function. The PUI velocity in the solar wind frame depends on…
Challenges in identifying the coronal hole wind
Verena Heidrich-Meisner, Sophie Teichmann, Lars Berger +1
Solar wind is frequently categorized based on its respective solar source region. Two well-established categorizations of the coronal hole wind, the scheme based on the charge-stat…