Low-frequency waves observed in the vicinity of the Earth's bow shock

1979 ◽  
Vol 2 (6) ◽  
pp. 789-814 ◽  
Author(s):  
V. Formisano
Keyword(s):  
Low Frequency ◽  
Bow Shock ◽  
Earth’S Bow Shock ◽  
Low Frequency Waves

WIND observation of gyrating-like ion distributions and low frequency waves upstream from the Earth's bow shock

1997 ◽  
Vol 20 (4-5) ◽  
pp. 703-706 ◽  
Author(s):  
K. Meziane ◽  
C. Mazelle ◽  
C. d'Uston ◽  
H. Rème ◽  
R.P. Lin ◽  
...  
Keyword(s):  
Low Frequency ◽  
Bow Shock ◽  
Wind Observation ◽  
Ion Distributions ◽  
Earth’S Bow Shock ◽  
Low Frequency Waves

Ultra low frequency waves at the Earth's bow shock

1995 ◽  
Vol 15 (8-9) ◽  
pp. 285-296 ◽  
Author(s):  
C.T Russell ◽  
M.H Farris
Keyword(s):  
Low Frequency ◽  
Bow Shock ◽  
Earth’S Bow Shock ◽  
Low Frequency Waves

Three-dimensional observations of gyrating ion distributions far upstream from the Earth's bow shock and their association with low-frequency waves

2001 ◽  
Vol 106 (A4) ◽  
pp. 5731-5742 ◽  
Author(s):  
K. Meziane ◽  
C. Mazelle ◽  
R. P. Lin ◽  
D. LeQuéau ◽  
D. E. Larson ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Low Frequency ◽  
Bow Shock ◽  
Ion Distributions ◽  
Earth’S Bow Shock ◽  
Low Frequency Waves

scholarly journals Helium in the Earth’s foreshock: a global Vlasiator survey

2020 ◽  
Author(s):  
Markus Battarbee ◽  
Xochitl Blanco-Cano ◽  
Lucile Turc ◽  
Primož Kajdič ◽  
Andreas Johlander ◽  
...  
Keyword(s):  
Specular Reflection ◽  
Cone Angle ◽  
Low Frequency ◽  
Bow Shock ◽  
Wave Interactions ◽  
Global Context ◽  
Ulf Wave ◽  
Ion Interactions ◽  
Earth’S Bow Shock ◽  
Low Frequency Waves

Abstract. The foreshock is a region of space upstream of the Earth's bow shock extending along the interplanetary magnetic field. It is permeated by shock-reflected ions and electrons, low-frequency waves, and various plasma transients. We investigate the extent of the He2+ foreshock using Vlasiator, a global hybrid-Vlasov simulation. We perform the first numerical global survey of the helium foreshock, and interpret some historical foreshock observations in a global context. The foreshock edge is populated by both proton and helium field-aligned beams, with the proton foreshock extending slightly further into the solar wind than the helium foreshock, and both extend well beyond the ULF wave foreshock. We compare our simulation results with MMS HPCA measurements, showing how the gradient of suprathermal ion densities at the foreshock crossing can vary between events. Our analysis suggests that the IMF cone angle and the associated shock obliquity gradient can play a role in explaining this differing behaviour. We also investigate wave-ion-interactions with wavelet analysis and show that the dynamics and heating of He2+ must result from proton-driven ULF waves. Enhancements in ion agyrotropy are found in relation to, e.g., the ion foreshock boundary, the ULF foreshock boundary, and specular reflection of ions at the bow shock. We show that specular reflection can describe many of the foreshock ion VDF enhancements. Wave-wave-interactions deep in the foreshock cause decoherence of wavefronts, allowing He2+ the be scattered less than protons.

Attenuation distance of low frequency waves upstream of the pre-dawn bow shock: GEOTAIL and ISEE 3 comparison

1995 ◽  
Vol 22 (2) ◽  
pp. 81-84 ◽  
Author(s):  
T. Sugiyama ◽  
T. Terasawa ◽  
H. Kawano ◽  
T. Yamamoto ◽  
S. Kokubun ◽  
...  
Keyword(s):  
Low Frequency ◽  
Bow Shock ◽  
Low Frequency Waves

Electron Scattering by Low-frequency Whistler Waves at Earth’s Bow Shock

2019 ◽  
Vol 886 (1) ◽  
pp. 53 ◽  
Author(s):  
M. Oka ◽  
F. Otsuka ◽  
S. Matsukiyo ◽  
L. B. Wilson ◽  
M. R. Argall ◽  
...  
Keyword(s):  
Electron Scattering ◽  
Low Frequency ◽  
Bow Shock ◽  
Whistler Waves ◽  
Earth’S Bow Shock

scholarly journals Low-frequency magnetic variations at the high-<i>β</i> Earth bow shock

2019 ◽  
Vol 37 (5) ◽  
pp. 877-889
Author(s):  
Anatoli A. Petrukovich ◽  
Olga M. Chugunova ◽  
Pavel I. Shustov
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Spatial Scales ◽  
Low Frequency ◽  
Background Field ◽  
Bow Shock ◽  
Stable Phase ◽  
Main Magnetic Field ◽  
Astrophysical Plasmas ◽  
Earth’S Bow Shock

Abstract. Observations of Earth's bow shock during high-β (ratio of thermal to magnetic pressure) solar wind streams are rare. However, such shocks are ubiquitous in astrophysical plasmas. Typical solar wind parameters related to high β (here β>10) are as follows: low speed, high density, and a very low interplanetary magnetic field of 1–2 nT. These conditions are usually quite transient and need to be verified immediately upstream of the observed shock crossings. In this report, three characteristic crossings by the Cluster project (from the 22 found) are studied using multipoint analysis, allowing us to determine spatial scales. The main magnetic field and density spatial scale of about a couple of hundred of kilometers generally corresponds to the increased proton convective gyroradius. Observed magnetic variations are different from those for supercritical shocks, with β∼1. Dominant magnetic variations in the shock transition have amplitudes much larger than the background field and have a frequency of ∼ 0.3–0.5 Hz (in some events – 1–2 Hz). The wave polarization has no stable phase and is closer to linear, which complicates the determination of the wave propagation direction. Spatial scales (wavelengths) of variations are within several tens to a couple of hundred of kilometers.

scholarly journals Upstream Ultra‐Low Frequency Waves Observed by MESSENGER's Magnetometer: Implications for Particle Acceleration at Mercury's Bow Shock

2020 ◽  
Vol 47 (9) ◽  
Author(s):  
N. Romanelli ◽  
G. DiBraccio ◽  
D. Gershman ◽  
G. Le ◽  
C. Mazelle ◽  
...  
Keyword(s):  
Particle Acceleration ◽  
Low Frequency ◽  
Bow Shock ◽  
Low Frequency Waves
Sign in / Sign up

Export Citation Format

Share Document