24 citations · 71 across the 11 of their papers we have counts for
11 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…
How the area of solar coronal holes affects the properties of high-speed solar wind streams near Earth -- An analytical model
Stefan Johann Hofmeister, Eleanna Asvestari, Jingnan Guo +10
We derive a simple analytical model for the propagation of HSSs from the Sun to Earth and thereby show how the area of coronal holes and the size of their boundary regions affect t…
An elliptic expansion of the potential field source surface model
Martin Kruse, Verena Heidrich-Meisner, R. F. Wimmer-Schweingruber +1
Context. The potential field source surface model is frequently used as a basis for further scientific investigations where a comprehensive coronal magnetic field is of importance.…
Proton-proton collisional age to order solar wind types
Verena Heidrich-Meisner, Lars Berger, Robert F. Wimmer-Schweingruber
The properties of a solar wind stream are determined by its source region and by transport effects. Independently of the solar wind type, the solar wind measured in situ is always…
Disparity among low first ionization potential elements
Verena Heidrich-Meisner, Lars Berger, Robert F. Wimmer-Schweingruber
The elemental composition of the solar wind differs from the solar photospheric composition. Elements with low first ionization potential (FIP) appear enhanced compared to O in the…
Observations of high and low Fe charge states in individual solar wind streams with coronal-hole origin
Verena Heidrich-Meisner, Thies Peleikis, Martin Kruse +2
The solar wind originating from coronal holes is comparatively well-understood and is characterized by lower densities and average charge states compared to the so-called slow sola…
Evolution of an equatorial coronal hole structure and the released coronal hole wind stream: Carrington rotations 2039 to 2050
Verena Heidrich-Meisner, Thies Peleikis, Martin Kruse +2
The Sun is a highly dynamic environment that exhibits dynamic behavior on many different timescales. In particular, coronal holes exhibit temporal and spatial variability. Signatur…