Article
Astronomy & Astrophysics
Qingtao Wan, Guanyi Ma, Takashi Maruyama, Jinghua Li, Xiaolan Wang, Weijun Lu
Summary: A study of an ionospheric positive disturbance during a moderate geomagnetic storm on October 13, 2016 showed that the disturbance propagated equatorward, impacting electron density during the daytime with an increase in equatorward wind at night. The propagation velocity decreased with decreasing latitude.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Engineering, Aerospace
B. J. Adekoya, V. U. Chukwuma, S. J. Adebiyi, B. O. Adebesin, S. O. Ikubanni, O. S. Bolaji, H. T. Oladunjoye, O. O. Bisuga
Summary: This paper examines the effects of geomagnetic storms on Earth's ionosphere in the American and Asian-Australian sectors during two specific storms. The analysis reveals different storm effects in these sectors and provides insights into plasma redistributions during the storms. The differences observed can be attributed to variations in solar wind driver gases and associated ring current mechanisms.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Astronomy & Astrophysics
N. Nowrouzi, L. M. Kistler, K. Zhao, E. J. Lund, C. Mouikis, G. Payne, B. Klecker
Summary: This study investigates the variations of ionospheric O+ and H+ outflow during SIR and CME storms and their dependence on storm phase, storm size, solar EUV flux, solar cycle, and seasonal effects. The results show that both CME and SIR storms exhibit peak O+ and H+ fluences during the main phase, with a decline in the recovery phase. However, CME storms also show a significant increase during the initial phase, which can be attributed to the onset of outflow before the main phase. The study also finds that outflow fluence is higher for intense storms and during solar maximum.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Jacob Fruchtman, Jasper Halekas, Jacob Gruesbeck, David Mitchell, Christian Mazelle
Summary: The Martian bow shock exhibits foot, ramp, and overshoot substructures, which are not affected by the seasonal variability of the Sun-Mars system. The properties of the solar wind, rather than Mars' location in its orbit, primarily control the structure of the bow shock.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Jacob Fruchtman, Jasper Halekas, Jacob Gruesbeck, David Mitchell, Christian Mazelle
Summary: The structure of the Martian bow shock is mainly controlled by the properties of the solar wind, rather than by the seasonal variability of the Sun-Mars system.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2023)
Article
Astronomy & Astrophysics
M. N. Pedersen, H. Vanhamaki, A. T. Aikio, S. Kaki, A. B. Workayehu, C. L. Waters, J. W. Gjerloev
Summary: This study investigates the impact of 28 geomagnetic storms driven by high-speed streams and associated stream interaction regions on ionospheric horizontal and field-aligned currents during 2010-2017. The currents peak 4-5.3 hours after the onset of the storm main phase, driven strongly by the solar wind. High solar wind dynamic pressure storms exhibit faster solar wind velocity maxima and shorter lead times compared to low dynamic pressure events.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Geochemistry & Geophysics
Dezhong Chen, Wenfei Guo, Zichun Xie, Pengfei Xia, Xiaomin Luo, Shirong Ye, Weiping Jiang, Haifeng Liu
Summary: This study uses GNSS data from the Hong Kong region to comprehensively investigate the response of ionospheric irregularities to strong geomagnetic storms between 2001 and 2020. Statistical results show that out of the 64 strong storms, only 20 triggered irregular occurrences. The study also found that when the minimum dDst occurred between 10:00 and 14:00 local time, no ionospheric irregularities were observed at night, while when it occurred between 18:00 and 21:00 local time, ionospheric irregularities were detected in 10 out of 12 storms.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Engineering, Aerospace
Oluwole J. Oyedokun, P. O. Amaechi, A. O. Akala, K. G. Simi, Aghogho Ogwala, E. O. Oyeyemi
Summary: This study investigates the sequence of solar and interplanetary events that drove the geomagnetic storms on 1 June 2013 and October 2015, as well as the response of the Equatorial Ionization Anomaly (EIA) regions in the American and African sectors. The study utilizes Total Electron Content (TEC) and ionospheric irregularities derived from Global Navigation Satellite System (GNSS) receivers to analyze the EIA structures. The findings indicate hemispherical asymmetry in ionospheric TEC and irregularities distributions during the storms, and the response of the ionosphere depends on the local time of the storm's onset and main phase minimum.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Chemistry, Analytical
Liming He, Cong Guo, Quanyou Yue, Shixuan Zhang, Zenghui Qin, Junfei Zhang
Summary: In this paper, a new method is proposed to quantitatively evaluate the quality of carrier phase observation signals of the BeiDou Navigation Satellite System (BDS) during weak and moderate geomagnetic storms. The newly defined PAS (Percentage of Affected Satellites) index shows significant anomaly changes during moderate geomagnetic storms and has good correlations with the geomagnetic storm Kp index and Dst index. The proposed PAS index has a good indication for both BDS2 and BDS3 satellites and can be validated by calculating the Precise Point Positioning (PPP) positioning error.
Article
Engineering, Aerospace
Sergii V. Panasenko, Kateryna D. Aksonova, Dalia Buresova, Oleksandr V. Bogomaz, Taras G. Zhivolup, Oleksandr V. Koloskov
Summary: This study presents the ground based remote sensing observations of large-scale traveling ionospheric disturbances (LSTIDs) occurring over central and eastern Europe. Two types of LSTIDs are detected, the magnetic storm-related LSTIDs exhibit equatorward propagation, while the solar terminator induced LSTIDs demonstrate variability over different locations.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Astronomy & Astrophysics
C-T Hsu, T. Matsuo, A. Maute, R. Stoneback, C-P Lien
Summary: Research shows that solar extreme ultraviolet dominates the day-to-day global variability, while lower atmosphere tide and wave forcing are critical for regional variability. External forcings also impact the modeled vertical E x B drift.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Physics, Multidisciplinary
C. Idosa Uga, E. Beshir Seba
Summary: This study investigates the ionospheric response to a moderate geomagnetic storm and a partial solar eclipse in April 2022. TEC data was collected from the Falkland, Montevideo, and Santiago stations using GPS receivers. The results show that the ionospheric TEC response to the geomagnetic storm is stronger than the response to the solar eclipse at all stations. The Falkland station, located at a higher latitude, experiences a larger TEC change during the storm, while the Santiago station, with a longer and stronger eclipse, shows a substantial TEC change.
INDIAN JOURNAL OF PHYSICS
(2023)
Article
Mechanics
Ziao Wang, Xuanan Xin, Jifeng Guo, Lianjie Yue, Chen Kong, Renzhe Huang, Juntao Chang
Summary: Shock train hysteresis phenomena were investigated in a supersonic isolator with background waves. The experiments and simulations showed the movement of impingement points and pressure changes in the boundary layers. The hysteresis occurs due to the interaction between shock trains and background waves, leading to a bistable system.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2023)
Article
Geosciences, Multidisciplinary
Dong Wei, Malcolm W. Dunlop, Junying Yang, Xiangcheng Dong, Yiqun Yu, Tieyan Wang
Summary: This study investigated the characteristics and responses of the magnetosphere-ionosphere-ground system during the January 7, 2015 storm using a multipoint approach combining space-borne measurements and ground magnetic observations. The results provide direct evidence that intense geomagnetic perturbations are caused by magnetospheric BBFs, leading to localized substorm currents. The intense dB/dt variations are associated with a large-scale, substorm current system, driven by multiple BBFs.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
X. C. Dong, M. W. Dunlop, T. Y. Wang, J. S. Zhao, H. S. Fu, Z. Z. Chen, C. T. Russell, B. Giles, R. Ergun, P. Lindqvist
Summary: Utilizing MMS data, this study investigates the energy dissipation in a magnetopause reconnection electron diffusion region event with moderate guide field. While a quasi-homogeneous magnetic and current structure is formed in the diffusion region, differences in energy dissipations detected by each spacecraft are attributed to the temporal or spatial effect of the out-of-plane reconnection electric field within the dissipation region.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Astronomy & Astrophysics
Chao Shen, Yufei Zhou, Yonghui Ma, Xiaogang Wang, Zuyin Pu, M. Dunlop
Summary: A novel algorithm is proposed to estimate linear and quadratic gradients of physical quantities based on multiple spacecraft observations using the least squares method. The algorithm shows high accuracy in both linear and quadratic gradient calculations, making it suitable for future multiple spacecraft missions and analysis of multi-point measurement data.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Chao Shen, Chi Zhang, Zhaojin Rong, Zuyin Pu, Malcolm W. Dunlop, C. Philippe Escoubet, C. T. Russell, Gang Zeng, Nian Ren, James L. Burch, Yufei Zhou
Summary: The study presents a novel algorithm that can estimate the quadratic magnetic gradient and complete geometrical features of magnetic field lines with high accuracy. The algorithm's feasibility and accuracy have been verified through two demonstrations, showing successful application in exhibiting the geometrical structure of magnetic fields in space plasmas. This algorithm has wide applications for studying various magnetic configurations in space plasmas.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Elias Roussos, Oliver Allanson, Nicolas Andre, Bruna Bertucci, Graziella Branduardi-Raymont, George Clark, Konstantinos Dialynas, Iannis Dandouras, Ravindra T. Desai, Yoshifumi Futaana, Matina Gkioulidou, Geraint H. Jones, Peter Kollmann, Anna Kotova, Elena A. Kronberg, Norbert Krupp, Go Murakami, Quentin Nenon, Tom Nordheim, Benjamin Palmaerts, Christina Plainaki, Jonathan Rae, Daniel Santos-Costa, Theodore Sarris, Yuri Shprits, Ali Sulaiman, Emma Woodfield, Xin Wu, Zonghua Yao
Summary: Jupiter's radiation belts are one of the most complex and energetic in the Solar System, posing unique challenges for exploration. Study of these belts provides opportunities for interdisciplinary research into high energy plasma physics processes and astrobiological implications. A dedicated multi-spacecraft mission to Jupiter is essential for advancing our understanding of radiation belt systems and exploring Jupiter's extended magnetosphere, moons, and rings.
EXPERIMENTAL ASTRONOMY
(2022)
Article
Astronomy & Astrophysics
P. Robert, M. W. Dunlop
Summary: This study utilizes 20-year data from the Cluster FGM magnetometer and spacecraft position to create a time-aligned database. By averaging and interpolating the data, a 3D grid of spatial extent can be formed, allowing the observation of the average behavior of the magnetic field and current density on a large scale. The grids also enable the measurement of the magnetic field at any point in space, providing the potential for ray tracing and empirical modeling of magnetic field lines.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Masatoshi Yamauchi, Johan De Keyser, George Parks, Shin-ichiro Oyama, Peter Wurz, Takumi Abe, Arnaud Beth, Ioannis A. Daglis, Iannis Dandouras, Malcolm Dunlop, Pierre Henri, Nickolay Ivchenko, Esa Kallio, Harald Kucharek, Yong C-M Liu, Ingrid Mann, Octav Marghitu, Georgios Nicolaou, Zhaojin Rong, Takeshi Sakanoi, Joachim Saur, Manabu Shimoyama, Satoshi Taguchi, Feng Tian, Takuo Tsuda, Bruce Tsurutani, Drew Turner, Thomas Ulich, Andrew Yau, Ichiro Yoshikawa
Summary: The White Paper highlights the importance of plasma-neutral gas interactions and emphasizes that addressing fundamental questions in this area is crucial for understanding atmospheric escape and the origin of biomolecules. It also suggests using a minimum core instrument package for investigations in various conditions, which should be included in all deep-space missions.
EXPERIMENTAL ASTRONOMY
(2022)
Article
Astronomy & Astrophysics
T. Alberti, W. Sun, A. Varsani, D. Heyner, S. Orsini, A. Milillo, J. A. Slavin, J. M. Raines, A. Aronica, H. -u. Auster, S. Barabash, E. De Angelis, I. Dandouras, R. Jarvinen, H. Jeszenszky, E. Kallio, A. Kazakov, G. Laky, S. Livi, V. Mangano, S. Massetti, M. Moroni, A. Mura, R. Noschese, C. Plainaki, F. Plaschke, I. Richter, R. Rispoli, R. Sordini, P. Wurz
Summary: This study uses SERENA/PICAM plasma observations and MPO-MAG magnetic field measurements to characterize the intermittent ion features observed in the solar wind upstream of Mercury, and validates the findings using Solar Orbiter observations at a larger distance.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Geosciences, Multidisciplinary
X. -c. Dong, M. W. Dunlop, C. Xiao, D. Wei, T. -y. Wang, J. -s. Zhao
Summary: Using data from Cluster and Swarm, we observed strong magnetic perturbations and mesoscale field-aligned current (FAC) structures in the high latitude polar cusp region during the 7 October 2015 storm. The observations provide evidence for the coupling of mesoscale FACs between the magnetosphere, ionosphere, and ground, driven by conditions suitable for inducing reconnection.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
X. Z. Li, Z. J. Rong, M. Fraenz, C. Zhang, L. Klinger, Z. Shi, J. W. Gao, M. W. Dunlop, Y. Wei
Summary: Using data from the Mars Atmosphere and Volatile EvolutioN mission, we studied the densities of H+, O+, and O-2(+) in the Martian magnetotail current sheet. We found that heavy ions dominate the current sheet when it is closer to the terminator, but H+ can sometimes dominate at downstream distances exceeding 0.75 Mars radii. The occurrence of dominant H+ weakly increases with solar wind density and dynamic pressure. Our results suggest that solar wind protons can enter the Martian tail and become the dominant ion species in the current sheet under high solar wind conditions.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Astronomy & Astrophysics
Theodore E. Sarris, Stelios Tourgaidis, Panagiotis Pirnaris, Dimitris Baloukidis, Konstantinos Papadakis, Christos Psychalas, Stephan Christoph Buchert, Eelco Doornbos, Mark A. Clilverd, Pekka T. Verronen, David Malaspina, Narghes Ahmadi, Iannis Dandouras, Anna Kotova, Wojciech J. Miloch, David Knudsen, Nils Olsen, Octav Marghitu, Tomoko Matsuo, Gang Lu, Aurelie Marchaudon, Alex Hoffmann, Dulce Lajas, Anja Stromme, Matthew Taylor, Anita Aikio, Minna Palmroth, Roderick Heelis, Nickolay Ivchenko, Claudia Stolle, Guram Kervalishvili, Therese Moretto-Jorgensen, Robert Pfaff, Christian Siemes, Pieter Visser, Jose van den Ijssel, Han-Li Liu, Ingmar Sandberg, Constantinos Papadimitriou, Joachim Vogt, Adrian Blagau, Nele Stachlys
Summary: Daedalus MASE is an open-source package of scientific analysis tools for research in the Lower Thermosphere-Ionosphere (LTI), with the ability to assess mission performance and demonstrate closure of objectives. It provides various capabilities related to LTI science and modeling.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2023)
Review
Astronomy & Astrophysics
Theodoros Sarris, Minna Palmroth, Anita Aikio, Stephan Christoph Buchert, James Clemmons, Mark Clilverd, Iannis Dandouras, Eelco Doornbos, Lindsay Victoria Goodwin, Maxime Grandin, Roderick Heelis, Nickolay Ivchenko, Therese Moretto-Jorgensen, Guram Kervalishvili, David Knudsen, Han-Li Liu, Gang Lu, David M. Malaspina, Octav Marghitu, Astrid Maute, Wojciech J. Miloch, Nils Olsen, Robert Pfaff, Claudia Stolle, Elsayed Talaat, Jeffrey Thayer, Stelios Tourgaidis, Pekka T. Verronen, Masatoshi Yamauchi
Summary: The lower thermosphere-ionosphere (LTI) is a critical transition region between Earth's atmosphere and space. However, its complex interactions between neutral and charged constituents remain poorly characterized due to the lack of in situ measurements. The quantification of key processes in the 100-200 km altitude range is essential for improving atmospheric models and space weather prediction capabilities.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2023)
Article
Astronomy & Astrophysics
X. Tan, M. W. Dunlop, X. -c. Dong, Y. -y. Yang, Y. -s. Du, C. Shen, C. T. Russell, W. -l. Liu
Summary: We estimated the in situ current density of the Earth's ring current using the curlometer method and examined its morphology using the Magnetospheric Multiscale mission's high accuracy data. Statistical analysis of data from September 2015 to the end of 2016 revealed a near-equatorial morphology of the ring current in terms of radial distance and magnetic local time. We also discovered asymmetries in the inner and outer currents, suggesting peak and valley plasma pressure contributions.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Iannis Dandouras, Matt G. G. T. Taylor, Johan De Keyser, Yoshifumi Futaana, Ruth A. Bamford, Graziella Branduardi-Raymont, Jean-Yves Chaufray, Dragos Constantinescu, Elisabetta De Angelis, Pierre Devoto, Jonathan Eastwood, Marius Echim, Philippe Garnier, Benjamin Grison, David Hercik, Helmut Lammer, Andre Laurens, Francois Leblanc, Anna Milillo, Rumi Nakamura, Lubomir Prech, Elias Roussos, Stepan Stverak, Julien Forest, Arnaud Trouche, Sebastien L. G. Hess, Jean-Charles Mateo-Velez, James Carpenter, Josef Winter
Summary: The Lunar Orbital Platform - Gateway (LOP-Gateway), assembled and operated by NASA and international partner organizations, offers new opportunities for scientific research in the vicinity of the Moon. It provides a unique location to study the deep space plasma environment and its interaction with the lunar surface and exosphere. This paper explores the potential of externally mounted payloads on the Gateway for space plasma physics research and the impact of the space environment on an inhabited platform.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2023)
Article
Astronomy & Astrophysics
S. E. Milan, M. K. Mooney, G. E. Bower, M. G. G. T. Taylor, L. J. Paxton, I. Dandouras, A. N. Fazakerley, C. M. Carr, B. J. Anderson, S. K. Vines
Summary: We investigated a 15-day period in October 2011 and found weak cusp-aligned arc (CAA) emissions in the polar regions when the interplanetary magnetic field (IMF) clock angle was small. Simultaneous observations of ions and electrons showed that dense plasma was observed even far from the equatorial plane of the tail. We interpret the observations as evidence of trapped plasma on closed field lines, suggesting that the magnetosphere was almost entirely closed during these periods.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2023)