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  • English  (2)
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  • 1
    Publication Date: 2022-03-17
    Description: The magnetopause marks the outer edge of the Earth's magnetosphere and a distinct boundary between solar wind and magnetospheric plasma populations. In this study, we use global magnetohydrodynamic simulations to examine the response of the terrestrial magnetopause to fast-forward interplanetary shocks of various strengths and compare to theoretical predictions. The theory and simulations indicate the magnetopause response can be characterized by three distinct phases; an initial acceleration as inertial forces are overcome, a rapid compressive phase comprising the majority of the distance traveled, and large-scale damped oscillations with amplitudes of the order of an Earth radius. The two approaches agree in predicting subsolar magnetopause oscillations with frequencies 2–13 mHz but the simulations notably predict larger amplitudes and weaker damping rates. This phenomenon is of high relevance to space weather forecasting and provides a possible explanation for magnetopause oscillations observed following the large interplanetary shocks of August 1972 and March 1991.
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
    Publication Date: 2023-08-29
    Description: Turbulence and magnetic reconnection are both fundamental phenomena, occurring across a wide variety of plasma systems from the laboratory to space and astrophysical plasmas. The nonlinear dynamics within a turbulent system are well known to generate intense current sheets, which have long been thought to be locations where magnetic reconnection can occur. However, the complex magnetic topologies and small-scale nature of this “turbulence-driven” magnetic reconnection has traditionally made it challenging to study from both a numerical and observational perspective. Over the past 8 years, NASA’s Magnetospheric Multiscale (MMS) mission has been providing cutting-edge, high-time-resolution, multipoint measurements that are capable of directly observing turbulence-driven magnetic reconnection events in Earth’s turbulent magnetosheath in unprecedented detail. In this talk, we will discuss the observations that have been made of turbulence-driven reconnection with MMS, demonstrating how the properties of the turbulent environment can influence how magnetic reconnection proceeds – leading to so-called electron-only reconnection. We will further discuss the potential role of these magnetic reconnection events in the turbulent plasma and what the recent observations from Earth’s magnetosheath may reveal about turbulence-driven magnetic reconnection in other space and astrophysical plasma environments, such as the solar wind.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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