Results 51 to 60 of about 89 (66)
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Modeling the Expansion Speed of Foreshock Bubbles
Journal of Geophysical Research: Space Physics, 2023AbstractForeshock transients, including hot flow anomalies (HFAs) and foreshock bubbles (FBs), are frequently observed in the ion foreshock. Their significant dynamic pressure perturbations can disturb the bow shock, resulting in disturbances in the magnetosphere and ionosphere.
Terry Z Liu, Andrew Vu, Hui Zhang
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Comparison of MMS Observations of Foreshock Bubbles With a Global Hybrid Simulation
Journal of Geophysical Research: Space Physics, 2021AbstractWe present multi‐point observations of foreshock bubbles (FBs) for comparison with the predictions of hybrid simulations. The four Magnetospheric Multiscale (MMS) spacecraft observed a series of discontinuities in the region upstream from the bow shock on December 18, 2017. Two solar wind discontinuities were associated with fully developed FBs
S H Lee, D G Sibeck, N Omidi
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Foreshock Bubbles at Venus: Hybrid Simulations and VEX Observations
Journal of Geophysical Research: Space Physics, 2020AbstractIn the absence of a global magnetic field at Venus, its ionosphere is the obstacle to the flow of the solar wind resulting in the formation of a smaller bow shock and foreshock. Spacecraft observations and global hybrid (kinetic ions, fluid electrons) simulations have demonstrated that despite its smaller size, the foreshock at Venus has ...
N Omidi, Glyn Collinson, D G Sibeck
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Ion Acceleration by Foreshock Bubbles: Magnetospheric Multiscale Observations
Journal of Geophysical Research: Space Physics, 2023AbstractForeshock bubbles (FBs) occur when interplanetary magnetic field discontinuities encounter the Earth's foreshock. These transient (∼1 to 5 min) features exhibit depressed densities and magnetic field strengths, enhanced temperatures, and deflected plasma flows trailed by a region of enhanced plasma density and magnetic field strength.
S H Lee, D G Sibeck, N Omidi
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Journal of Geophysical Research: Space Physics, 2022
AbstractForeshock transients such as foreshock bubbles (FBs), hot flow anomalies (HFAs), and spontaneous hot flow anomalies (SHFAs) display heated, tenuous cores and large flow deflections bounded by compressional boundaries. THEMIS and Cluster observations show that some cores contain local density enhancements which can be studied to better ...
Andrew Vu, Terry Z Liu, Hui Zhang
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AbstractForeshock transients such as foreshock bubbles (FBs), hot flow anomalies (HFAs), and spontaneous hot flow anomalies (SHFAs) display heated, tenuous cores and large flow deflections bounded by compressional boundaries. THEMIS and Cluster observations show that some cores contain local density enhancements which can be studied to better ...
Andrew Vu, Terry Z Liu, Hui Zhang
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Journal of Geophysical Research: Space Physics, 2023
AbstractForeshock bubbles (FBs) are significant foreshock transients that can accelerate particles and disturb the magnetosphere‐ionosphere system. In the kinetic formation model, foreshock ions interact with the discontinuity by performing partial gyrations to generate currents that change the magnetic field topology around the discontinuity. However,
Andrew Vu, Terry Z Liu, Hui Zhang
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AbstractForeshock bubbles (FBs) are significant foreshock transients that can accelerate particles and disturb the magnetosphere‐ionosphere system. In the kinetic formation model, foreshock ions interact with the discontinuity by performing partial gyrations to generate currents that change the magnetic field topology around the discontinuity. However,
Andrew Vu, Terry Z Liu, Hui Zhang
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Foreshock bubbles and their global magnetospheric impacts
Journal of Geophysical Research, 2010We employ 2.5‐D electromagnetic, hybrid simulations that treat ions kinetically via particle‐in‐cell methods and electrons as a massless fluid to study the formation and properties of a new structure named the foreshock bubble upstream from the bow shock.
N Omidi, J P Eastwood, D G Sibeck
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Journal of Geophysical Research: Space Physics, 2022
AbstractHot flow anomalies (HFAs) and foreshock bubbles (FBs) are significant foreshock transients that can accelerate particles and disturb the magnetosphere‐ionosphere system. Yet, their early formation mechanisms are still not fully understood. To investigate the formation of tangential discontinuity (TD)‐driven FBs and HFAs, we use 2‐D local hybrid
Andrew Vu, Terry Z Liu, Hui Zhang
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AbstractHot flow anomalies (HFAs) and foreshock bubbles (FBs) are significant foreshock transients that can accelerate particles and disturb the magnetosphere‐ionosphere system. Yet, their early formation mechanisms are still not fully understood. To investigate the formation of tangential discontinuity (TD)‐driven FBs and HFAs, we use 2‐D local hybrid
Andrew Vu, Terry Z Liu, Hui Zhang
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MMS observations of wave activity in the particle foreshock bubble foreshock region
2020<p>Foreshock bubbles (FBs) are kinetic transient phenomena formed due to the interaction between IMF discontinuities and backstreaming energetic ions in Earth&#8217;s foreshock region. FBs can be driven by both rotational discontinuities and tangential discontinuities and are typically observed under higher solar wind ...
Mengmeng Wang, Quanqi Shi
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Properties of the whistler precursor upstream of the foreshock bubble shock: MMS observations
2021<p>Foreshock bubbles (FBs) are kinetic phenomena that can form when a rotational discontinuity or a tangential discontinuity interacts with backstreaming ions in the Earth&#8217;s foreshock region. The scale of FBs can be up to 10 R<sub>E</sub> and the expansion speeds can be more than 100 km/s.
Mengmeng Wang +5 more
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