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Finding foreshocks in the damage zone
Science, 2017Geophysics![Figure][1] Damage done by a 2005 earthquake in Balakot, Pakistan PHOTO: AGENCJA FOTOGRAFICZNA CARO/ALAMY STOCK PHOTO Foreshocks are small earthquakes that precede much larger and more damaging earthquakes.
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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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Advances in Space Research, 1995
Plasma waves observed in the VLF range upstream of planetary bow shocks not only modify the particle distributions, but also provide important information about the acceleration processes that occur at the bow shock. Electron plasma oscillations observed near the tangent field line in the electron foreshock are generated by electrons reflected at the ...
E.W Greenstadt, G Le, R.J Strangeway
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Plasma waves observed in the VLF range upstream of planetary bow shocks not only modify the particle distributions, but also provide important information about the acceleration processes that occur at the bow shock. Electron plasma oscillations observed near the tangent field line in the electron foreshock are generated by electrons reflected at the ...
E.W Greenstadt, G Le, R.J Strangeway
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1985
ISEE particle and wave data are noted to furnish substantial support for the basic features of the velocity dispersed model at the foreshock boundary that was proposed by Filbert and Kellogg (1979). Among many remaining discrepancies between this model and observation, it is noted that unstable reduced velocity distributions have been discovered behind
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ISEE particle and wave data are noted to furnish substantial support for the basic features of the velocity dispersed model at the foreshock boundary that was proposed by Filbert and Kellogg (1979). Among many remaining discrepancies between this model and observation, it is noted that unstable reduced velocity distributions have been discovered behind
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A study of ULF wave foreshock morphology—I: ULF foreshock boundary
Planetary and Space Science, 1992Abstract We have used ISEE 1 and 2 magnetometer data to determine the forward boundary of the upstream ULF wave foreshock. We first examine the presence and absence of ULF waves immediately upstream from the bow shock. The statistical results show that the ULF foreshock starts at θBn ∼ 50° on the bow shock, and fills the entire upstream region ...
G. Le, C.T. Russell
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Foreshocks of strong earthquakes
Izvestiya, Physics of the Solid Earth, 2014The specific enhancement of ultra-low-frequency (ULF) electromagnetic oscillations a few hours prior to the strong earthquakes, which was previously mentioned in the literature, motivated us to search for the distinctive features of the mechanical (foreshock) activity of the Earth’s crust in the epicentral zones of the future earthquakes. Activation of
A. V. Guglielmi +3 more
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Foreshocks and earthquake prediction
Tectonophysics, 1975Abstract Results of a statistical investigation of the magnitude and time distributions of foreshocks in the area of Greece are reported. Further evidence is presented that the parameter b , in the frequency—magnitude relation, has a smaller value before than after the main shock, and that the time distribution of foreshocks follows a statistical ...
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Foreshock compressional boundary
Journal of Geophysical Research: Space Physics, 2009We 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 newly discovered boundary named the foreshock compressional boundary (FCB).
N. Omidi, D. G. Sibeck, X. Blanco‐Cano
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Solar wind deceleration in the foreshock as the source of the foreshock compressive structures
The foreshock is a turbulent region located upstream of the quasi parallel bow shock. It is dominated by waves and reflected back-streaming particles that interact with each other and result in the creation of different foreshock phenomena. Xirogiannopoulou et al.Niki Xirogiannopoulou +3 more
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