Results 91 to 100 of about 94,773 (106)

THEMIS observations of tangential discontinuity-driven foreshock bubbles [PDF]

Geophysical Research Letters, 2015
AbstractForeshock bubbles (FBs), transient ion foreshock phenomena formed from highly concentrated suprathermal foreshock ions upstream of solar wind discontinuities, produce intense disturbances in the magnetosphere‐ionosphere system and can accelerate particles to even higher energies. Rotational discontinuities are known to drive FBs.
Vassilis Angelopoulos, Nojan Omidi
exaly   +2 more sources

Multipoint observations of the structure and evolution of foreshock bubbles and their relation to hot flow anomalies [PDF]

Journal of Geophysical Research: Space Physics, 2016
AbstractWhen backstreaming foreshock ions pass through approaching solar wind discontinuities, they may get concentrated upstream of the discontinuities and form foreshock bubbles (FBs). Because FBs result in very intense global pressure variations upstream of and inside Earth's magnetosphere, they are important for solar wind‐magnetosphere coupling ...
Vassilis Angelopoulos, Nojan Omidi
exaly   +2 more sources

Ion Acceleration by Foreshock Bubbles: Magnetospheric Multiscale Observations

Journal of Geophysical Research: Space Physics, 2023
AbstractForeshock 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, M. V. D. Silveira, A. Vu, S. K. Vines, I. J. Cohen, S. A. Fuselier, H. Wei, C. T. Russell, J. L. Burch   +10 more
openaire   +1 more source

Hybrid Simulations of a Tangential Discontinuity-Driven Foreshock Bubble Formation in Comparison With a Hot Flow Anomaly Formation

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
Hui Zhang, Peter Delamere, Peter A Bieniek   +2 more
exaly   +2 more sources

Foreshock bubbles and their global magnetospheric impacts

Journal of Geophysical Research: Space Physics, 2010
We 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.
Nojan Omidi, David G. Sibeck, Jonathan Eastwood   +2 more
exaly   +2 more sources

Comparison of MMS Observations of Foreshock Bubbles With a Global Hybrid Simulation

Journal of Geophysical Research: Space Physics, 2021
AbstractWe 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, M. V. D. Silveira, B. L. Giles, R. B. Torbert, C. T. Russell, H. Wei, J. L. Burch   +8 more
openaire   +1 more source

Statistical Study of Foreshock Bubbles, Hot Flow Anomalies, and Spontaneous Hot Flow Anomalies and Their Substructures Observed by MMS

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 ...
Hui Zhang, Craig Pollock, Terry Z Liu
exaly   +2 more sources

Parameter Dependencies of Early-Stage Tangential Discontinuity-Driven Foreshock Bubbles in Local Hybrid Simulations

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,
Hui Zhang, Peter Delamere, Terry Z Liu
exaly   +2 more sources

Global impacts of a Foreshock Bubble: Magnetosheath, magnetopause and ground-based observations [PDF]

Planetary and Space Science, 2015
Using multipoint observations we show, for the first time, that Foreshock Bubbles (FBs) have a global impact on Earth's magnetosphere. We show that an FB, a transient kinetic phenomenon due to the interaction of backstreaming suprathermal ions with a discontinuity, modifies the total pressure upstream of the bow shock showing a decrease within the FB's
S J Schwartz
exaly   +4 more sources

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’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
openaire   +1 more source