Articles | Volume 42, issue 2
https://doi.org/10.5194/angeo-42-419-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-42-419-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Proton plasma asymmetries between the convective-electric-field hemispheres of Venus' dayside magnetosheath
Sebastián Rojas Mata
CORRESPONDING AUTHOR
Swedish Institute of Space Physics, Kiruna, Sweden
now at: Department of Engineering Mechanics, KTH Royal Institute of Technology, Stockholm, Sweden
Gabriella Stenberg Wieser
Swedish Institute of Space Physics, Kiruna, Sweden
Tielong Zhang
Space Research Institute, Austrian Academy of Science, Graz, Austria
Yoshifumi Futaana
Swedish Institute of Space Physics, Kiruna, Sweden
Related authors
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Markus Fraenz, Henning Fischer, Norbert Krupp, Elias Roussos, Philipp Wittmann, Patrick Bambach, Jan-Erik Wahlund, Gabriella Stenberg Wieser, Stas Barabash, Mika Holmberg, Maryam Zeroual, Pontus Brandt, Peter Wurz, Martin Wieser, Yoshifumi Futaana, Manabu Shimoyama, Angele Pontoni, Audrey Vorburger, Andre Galli, Andreas Riedo, George Ho, Donald Mitchell, George Clark, Peter Kollmann, Malamati Gkioulidou, Leonardo Regoli, Robert Wimmer-Schweingruber, Kazushi Asamura, Esa Kallio, Andrea Opitz, Manuel Grande, Andrew Coates, Geraint Jones, Theodoros Sarris, Andrey Fedorov, Nicolas André, and Ján Baláž
EGUsphere, https://doi.org/10.5194/egusphere-2026-2030, https://doi.org/10.5194/egusphere-2026-2030, 2026
This preprint is open for discussion and under review for Annales Geophysicae (ANGEO).
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During the first Earth gravity assist maneuver of the JUICE spacecraft in August 2024 the spacecraft passed through the Earth plasmasphere for about 2 hours. The ion spectrometer PEP JEI was able to make a very rare observation of the molecular ion fraction of the cold and dense plasma in the Earth plasmasphere. The observation shows that cold ions can emanate from the Earth ionosphere even at times when no magnetic storm enhances the ion extraction.
Gabriella Stenberg Wieser, Martin Wieser, Stas Barabash, Philipp Wittmann, Leif Kalla, Markus Fränz, Elias Roussos, Audrey Vorburger, Peter Wurz, Jan-Erik Wahlund, Pontus C. Brandt, Yoshifumi Futaana, Manabu Shimoyama, Angèle Pontoni, André Galli, Andreas Riedo, George Ho, Donald G. Mitchell, George Clark, Peter Kollmann, Malamati Gkioulidou, Leonardo Regoli, Norbert Krupp, Robert Wimmer-Schweingruber, Kazushi Asamura, Esa Kallio, Andrea Opitz, Manuel Grande, Andrew Coates, Geraint Jones, Theodoros Sarris, Andrey Fedorov, Nicolas André, and Ján Baláž
EGUsphere, https://doi.org/10.5194/egusphere-2026-2039, https://doi.org/10.5194/egusphere-2026-2039, 2026
This preprint is open for discussion and under review for Annales Geophysicae (ANGEO).
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We used Juice flyby of Earth in August 2024 to evaluate the performance of the Jovian Plasma Dynamics and Composition analyzer (JDC). JDC measures positive and negative ions as well as electrons. When Juice arrives at Jupiter, one of the most challenging tasks for JDC is to record low energy ion populations. We used the data JDC recorded close to Earth, together with measurement in the laboratory on ground, to improve the future observations the sensor will make around Jupiter’s icy moons.
Martin Volwerk, Cyril Simon Wedlund, David Mautner, Sebastián Rojas Mata, Gabriella Stenberg Wieser, Yoshifumi Futaana, Christian Mazelle, Diana Rojas-Castillo, César Bertucci, and Magda Delva
Ann. Geophys., 41, 389–408, https://doi.org/10.5194/angeo-41-389-2023, https://doi.org/10.5194/angeo-41-389-2023, 2023
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Freshly created ions in solar wind start gyrating around the interplanetary magnetic field. When they cross the bow shock, they get an extra kick, and this increases the plasma pressure against the magnetic pressure. This leads to the creation of so-called mirror modes, regions where the magnetic field decreases in strength and the plasma density increases. These structures help in exploring how energy is transferred from the ions to the magnetic field and where around Venus this is happening.
Cyril Simon Wedlund, Martin Volwerk, Christian Mazelle, Sebastián Rojas Mata, Gabriella Stenberg Wieser, Yoshifumi Futaana, Jasper Halekas, Diana Rojas-Castillo, César Bertucci, and Jared Espley
Ann. Geophys., 41, 225–251, https://doi.org/10.5194/angeo-41-225-2023, https://doi.org/10.5194/angeo-41-225-2023, 2023
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Mirror modes are magnetic bottles found in the space plasma environment of planets contributing to the energy exchange with the solar wind. We use magnetic field measurements from the NASA Mars Atmosphere and Volatile EvolutioN mission to detect them around Mars and show how they evolve in time and space. The structures concentrate in two regions: one behind the bow shock and the other closer to the planet. They compete with other wave modes depending on the solar flux and heliocentric distance.
Xiaowen Hu, Guoqiang Wang, Zonghao Pan, and Tielong Zhang
Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2021-46, https://doi.org/10.5194/angeo-2021-46, 2021
Preprint withdrawn
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We develop an automatic procedure based on the two criteria of the Wang-Pan method, and it consists of three parts: selection of the potentially high Alfvénic fluctuation events, evaluation of the OOLs, and determination of the zero offset. We test our automatic procedure by using three months of the partially calibrated data measured by VEX FGM, and find that our automatic procedure is successful to achieve as good results as the Davis-Smith method.
Geng Wang, Mingyu Wu, Guoqiang Wang, Sudong Xiao, Irina Zhelavskaya, Yuri Shprits, Yuanqiang Chen, Zhengyang Zou, Zhonglei Gao, Wen Yi, and Tielong Zhang
Ann. Geophys., 39, 613–625, https://doi.org/10.5194/angeo-39-613-2021, https://doi.org/10.5194/angeo-39-613-2021, 2021
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We investigate the reflection of magnetosonic (MS) waves at the local two-ion cutoff frequency in the outer plasmasphere, which is rarely reported. The observed wave signals demonstrate the reflection at the local two-ion cutoff frequency. From simulations, the waves with small incident angles are more likely to penetrate the thin layer where the group velocity reduces significantly before reflection. These results may help to predict the global distribution of MS waves.
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Short summary
The Sun ejects a stream of charged particles into space that have to flow around planets like Venus. We quantify how this flow varies with spatial location using spacecraft measurements of the particles and magnetic field taken over several years. We find that this flow is connected to interactions with the heavier charged particles that originate from Venus’ upper atmosphere. These interactions are not unique to Venus, so we compare our results to similar studies at Mars.
The Sun ejects a stream of charged particles into space that have to flow around planets like...