Results 221 to 230 of about 6,878 (250)

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 ...
Andrew Vu, Terry Z Liu, Hui Zhang
exaly   +2 more sources

A study of particle flows in hot flow anomalies

Planetary and Space Science, 2005
Abstract Hot flow anomalies (HFAs) are distinct disturbances of the solar wind flow observed often in the bow shock vicinity. Both experiment and theory suggest that these disturbances are created at the intersection of the bow shock and tangential discontinuity (TD) of the interplanetary magnetic field (IMF). The discontinuity is swept along the bow
A Koval, J Šafránková, Z Němeček
exaly   +2 more sources

Propagation characteristics of hot flow anomalies

2021
<p>Hot flow anomalies (HFAs), characterized by heated plasma and flow deflection, are frequently observed near Earth’s and other planetary bow shocks. There are two kinds of HFAs, classic HFAs formed by the interaction of tangential discontinuities (TD) and the bow shock, and spontaneous HFAs (SHFAs) which are not associated
Xiaoqiong Zhu, Mengmeng Wang, Quanqi Shi, Hui Zhang, Anmin Tian, Shutao Yao, Ruilong Guo, Ji Liu, Shichen Bai, Shuai Zhang, Wensai Shang, Zhe Niu   +11 more
openaire   +1 more source

The structure of hot flow anomalies in the magnetosheath

Advances in Space Research, 2002
Abstract The interaction of the solar wind with the Earth's magnetosphere creates a population of backstreaming ions. When a tangential discontinuity contacts the bow shock, these ions can be focused to the discontinuity region and create so-called Hot Flow Anomalies (HFAs) - diamagnetic cavities filled with hot, tenuous, and deflected plasma ...
J. Šafránková, L. Přech, Z. Němeček, D. Sibeck   +3 more
openaire   +1 more source

Cluster observations of hot flow anomalies

Journal of Geophysical Research: Space Physics, 2004
On 2 April 2002, Cluster entered the solar wind at high northern latitudes and observed a series of disturbances upstream of the bow shock. We suggest that these were signatures of a sequence of hot flow anomalies (HFAs), observed at different stages of development.
E. A. Lucek, T. S. Horbury, A. Balogh, I. Dandouras, H. Rème   +4 more
openaire   +1 more source

Spontaneous hot flow anomalies at Mars and Venus

Journal of Geophysical Research: Space Physics, 2017
AbstractWe report the first observations of Spontaneous Hot Flow Anomalies (SHFAs) at Venus and Mars, demonstrating their existence in the foreshocks of other planets beyond Earth. Using data from the ESA Venus Express and the NASA Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft, we present magnetic and plasma observations from events at both
Glyn Collinson, David Sibeck, Nick Omidi, Joseph Grebowsky, Jasper Halekas, David Mitchell, Jared Espley, Tielong Zhang, Moa Persson, Yoshifumi Futaana, Bruce Jakosky   +10 more
openaire   +1 more source

Hybrid simulation of the formation of a hot flow anomaly

Journal of Geophysical Research: Space Physics, 1991
Results are presented from two‐dimensional hybrid simulations of the interaction of a supercritical quasi‐perpendicular collisionless shock wave with current sheets embedded in the upstream flow. The current sheet normals are perpendicular to the shock normal.
V. A. Thomas, D. Winske, M. F. Thomsen, T. G. Onsager   +3 more
openaire   +1 more source

Magnetospheric Response to a Hot Flow Anomaly

1999
On July 24, 1996, Interball-1 was nominally located outside the dayside bow shock. For a few moments, the magnetopause moved outward to engulf the spacecraft. Wind observations provide no evidence for any corresponding perturbation in solar wind plasma parameters, although they do provide evidence for the passage of a tangential discontinuity.
D. G. Sibeck, N. L. Borodkova
openaire   +1 more source

Observational test of a hot flow anomaly formation mechanism

Journal of Geophysical Research: Space Physics, 1990
Hot flow anomalies (HFAs) are unique plasma structures observed in the vicinity of the Earth's bow shock. They are typically characterized by high temperature plasma which is strongly deflected relative to the solar wind and flanked by shock‐like density and magnetic field enhancements.
T. G. Onsager, M. F. Thomsen, J. T. Gosling, S. J. Bame   +3 more
openaire   +1 more source

Turbulent dynamics inside the cavity of hot flow anomaly

Planetary and Space Science, 2014
In this paper the turbulent dynamics of a hot flow anomaly (HFA) event is investigated. The HFAs are transient plasma disturbances generated by the interaction of the bow shock (BS) and a tangential discontinuity (TD) embedded in the solar wind. The typical changes of the plasma parameters inside HFAs (increased plasma temperature, low bulk velocity ...
P. Kovács, G. Facskó, I. Dandouras
openaire   +1 more source