Bulletin of the American Physical Society
Mid-Atlantic Section Meeting 2021
Volume 66, Number 18
Friday–Sunday, December 3–5, 2021; Rutgers University, New Brunswick, New Jersey
Session E02: Magnetosphere |
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Chair: Lindsay Goodwin, New Jersey Institute of Technology Room: 201B |
Saturday, December 4, 2021 2:00PM - 2:36PM |
E02.00001: Nonlinear Whistler Wave Generation in Space Plasmas* Invited Speaker: A. Rualdo Soto-Chavez In this talk, I'll present recent results on whistler wave generation by nonlinear induced scattering. Nonlinear induced scattering is a process that allows transfer of energy from one unstable mode $\omega_{1\, }$into another stable mode $\omega_{2\, }$and the particles that can satisfy the resonant condition. In our particular example, the nonlinear induced scattering of the whistler waves is achieved via lower-hybrid (LH) beat-wave coupling with thermal electrons. The LH waves are generated first by a cold but energetic ring ion distribution that is unstable to these waves [1]. Thus, this process acts as a saturation mechanism for the linearly unstable LH modes. This fundamental and interesting nonlinear mechanism is at the heart of the upcoming SMART experiment where LH modes will be converted to whistler modes via weak turbulence [2]. We present 2D PIC simulations with parameters close to those found in plasmas of the Earth's ionosphere at \textasciitilde 500 km of altitude (where the SMART experiment will be performed). However, nonlinear induced scattering is a universal phenomenon in turbulent plasmas. We'll also discuss the linear instability of multiple ion rings leading to various beam and LH waves. \begin{enumerate} \item Soto, A. Rualdo, et al., \textit{Phys Plasmas, }\textbf{27}, 122112, (2020). https://doi.org/10.1063/5.0025379 \item Ganguli, G., et al. (2019). \textit{JGR: Space Physics}, \textit{124}. https://doi.org/10.1029/ 2019JA027372. Crabtree, C., et al. (2012). \textit{PoP} 19, https://doi.org/10.1063/1.3692092. \end{enumerate} * Supported by DARPA and NRL Base Program. \begin{center} DISTRIBUTION A. Approved for public release: distribution unlimited. \end{center} [Preview Abstract] |
Saturday, December 4, 2021 2:36PM - 3:12PM |
E02.00002: Interhemispheric Asymmetries in High-Latitude Magnetosphere-Ionosphere Coupling Processes Invited Speaker: Hyomin Kim Given that the polar regions are critical for geospace research, the interhemispheric conjugacy and asymmetries in the polar regions remain an area fraught with unknowns and open questions, representing a barrier to understanding the coupled Magnetosphere-Ionosphere-Thermosphere (MIT) system. These interhemispheric features may manifest in a number of ways, including auroral patterns, induced electrical currents, geomagnetic field geometry, ionospheric electrodynamics, ion-neutral coupling, temperature and winds in the neutral atmosphere, and more.~ The interhemispheric differences can be attributed to a number of natural circumstances and various external drivers that interfere with complex coupling processes of the MIT system and complicate their signatures significantly. The MIT coupling processes associated with the energy input from the heliospheric system and the resulting feedback from the geospace can be misestimated due to the asymmetry, which has been overlooked. The assumption that the north and south are mirrored does not address the discrepancy found in observations and modeling work. We report on interhemispheric observations of geomagnetic pulsations and ionospheric convection in association with solar wind transient phenomena. The interaction between the solar wind and the magnetosphere induces a variety of geospace responses including electric currents and geomagnetic pulsations. Single-hemispheric observations, however, do not provide sufficient information on solar wind-magnetosphere-ionosphere coupling processes and energy transport to the geospace system. To address this issue, the present study focuses primarily on interhemispherically asymmetric features in the coupling processes associated with foreshock transient events by utilizing a ground instrument network at magnetically conjugate locations in both hemispheres. We investigate possible external drivers that affect asymmetries (e.g., IMF orientation, solar irradiance, geomagnetic activity, ionospheric conductivity, etc.). The spatiotemporal and spectral differences between the Interhemispheric responses are also reported. ~ [Preview Abstract] |
Saturday, December 4, 2021 3:12PM - 3:24PM |
E02.00003: Interhemispheric Pc 1 wave propagation associated with foreshock transient events during quiet solar wind condition Sungjun Noh, Hyomin Kim, Ilya Kuzichev, Dogacan Ozturk, Zhonghua Xu, James Weygand, Hui Zhang, Andrew Vu, Michael Hartinger, Xueling Shi, Mark Engebretson, Andrew Gerrard Hot flow anomalies and foreshock bubbles are transient phenomena observed near the ion foreshock that are associated with solar wind discontinuity. It is well known that these foreshock transient events can trigger geomagnetic disturbances such as ULF waves. In this presentation, we report a series of foreshock transient events that occurred under quiet solar wind and geomagnetic conditions. In association with the foreshock transient events, Pc 1 waves were observed by a ground-based magnetometer network in both hemispheres with some time delay after each foreshock transient onset. Magnetospheric satellite observations support that these waves were not generated within the magnetosphere but near the magnetopause. In addition, Pc 1 waves show interhemispheric asymmetries in their amplitudes and onset times. Our study focuses mainly on the analysis of the ground observations and the wave propagation from the source to the ground. We also suggest possible scenarios to explain the observations. [Preview Abstract] |
Saturday, December 4, 2021 3:24PM - 3:36PM |
E02.00004: Interaction between small-scale magnetic flux rope in the solar wind and Earth's magnetosphere, and the effect on the geospace environment Youra Shin, Sungjun Noh, Nengyi Huang, George Bizos, Hameedullah Farooki, Manal Desai, Kyung-Eun Choi, Haimin Wang, Hyomin Kim Small-scale magnetic flux ropes (SMFRs) are structures of helical magnetic field lines commonly observed in the solar wind. Since it is widely known that rotating magnetic field structure is favorable for build-up, release and transport of free energy, the interaction between SMFRs and the Earth's magnetosphere may lead to transient energy transfer near the boundary (e.g., flux transfer event or FTE) via magnetic reconnection in the dayside which consequently causes energetic particle injection from the plasma sheet. However, the observational assessment of their effect on the geospace environment has not yet been extensively studied. We present a statistical survey of geospace response to SMFRs in the context of solar and geomagnetic activity during solar cycle 23 and 24. The SMFRs are identified using the data from the spacecraft in the solar wind between Sun and Earth (e.g., ACE and Wind). Magnetic field and plasma characteristics during passages of the SMFRs are also discussed using data from the several magnetospheric missions near/in the magnetosphere (e.g., MMS, Cluster, GOES and Van Allen Probes). [Preview Abstract] |
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