Browsing by Author "Hasegawa, H."

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    Advanced Methods for Analyzing in-Situ Observations of Magnetic Reconnection
    (Springer Nature, 2024) Hasegawa, H.; Argall, M. R.; Aunai, N.; Bandyopadhyay, R.; Bessho, N.; Cohen, I. J.; Denton, R. E.; Dorelli, J. C.; Egedal, J.; Fuselier, S. A.; Garnier, P.; Génot, V.; Graham, D. B.; Hwang, K. J.; Khotyaintsev, Y. V.; Korovinskiy, D. B.; Lavraud, B.; Lenouvel, Q.; Li, T. C.; Liu, Y.-H.; Michotte de Welle, B.; Nakamura, T. K. M.; Payne, D. S.; Petrinec, S. M.; Qi, Y.; Rager, A. C.; Reiff, P. H.; Schroeder, J. M.; Shuster, J. R.; Sitnov, M. I.; Stephens, G. K.; Swisdak, M.; Tian, A. M.; Torbert, R. B.; Trattner, K. J.; Zenitani, S.; Rice Space Institute
    There is ample evidence for magnetic reconnection in the solar system, but it is a nontrivial task to visualize, to determine the proper approaches and frames to study, and in turn to elucidate the physical processes at work in reconnection regions from in-situ measurements of plasma particles and electromagnetic fields. Here an overview is given of a variety of single- and multi-spacecraft data analysis techniques that are key to revealing the context of in-situ observations of magnetic reconnection in space and for detecting and analyzing the diffusion regions where ions and/or electrons are demagnetized. We focus on recent advances in the era of the Magnetospheric Multiscale mission, which has made electron-scale, multi-point measurements of magnetic reconnection in and around Earth’s magnetosphere.
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    Cross-Scale Processes of Magnetic Reconnection
    (Springer Nature, 2023) Hwang, K.-J.; Nakamura, R.; Eastwood, J. P.; Fuselier, S. A.; Hasegawa, H.; Nakamura, T.; Lavraud, B.; Dokgo, K.; Turner, D. L.; Ergun, R. E.; Reiff, P. H.
    Various physical processes in association with magnetic reconnection occur over multiple scales from the microscopic to macroscopic scale lengths. This paper reviews multi-scale and cross-scale aspects of magnetic reconnection revealed in the near-Earth space beyond the general global-scale features and magnetospheric circulation organized by the Dungey Cycle. Significant and novel advancements recently reported, in particular, since the launch of the Magnetospheric Multi-scale mission (MMS), are highlighted being categorized into different locations with different magnetic topologies. These potentially paradigm-shifting findings include shock and foreshock transient driven reconnection, magnetosheath turbulent reconnection, flow shear driven reconnection, multiple X-line structures generated in the dayside/flankside/nightside magnetospheric current sheets, development and evolution of reconnection-driven structures such as flux transfer events, flux ropes, and dipolarization fronts, and their interactions with ambient plasmas. The paper emphasizes key aspects of kinetic processes leading to multi-scale structures and bringing large-scale impacts of magnetic reconnection as discovered in the geospace environment. These key features can be relevant and applicable to understanding other heliospheric and astrophysical systems.