Possible generation mechanisms of low-frequency waves (≲50 Hz) with application to the bow shock plasma

1979 ◽  
Vol 2 (6) ◽  
pp. 815-833
Author(s):  
N. D'Angelo
Keyword(s):  
Low Frequency ◽  
Bow Shock ◽  
Generation Mechanisms ◽  
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

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

scholarly journals Dispersion of low frequency plasma waves upstream of the quasi-perpendicular terrestrial bow shock

2013 ◽  
Vol 31 (8) ◽  
pp. 1387-1395 ◽  
Author(s):  
A. P. Dimmock ◽  
M. A. Balikhin ◽  
S. N. Walker ◽  
S. A. Pope
Keyword(s):  
Shock Front ◽  
Low Frequency ◽  
Theoretical Models ◽  
Wave Dispersion ◽  
Bow Shock ◽  
Energy Redistribution ◽  
Frequency Plasma ◽  
Streaming Flows ◽  
Low Frequency Waves

Abstract. Low frequency waves in the foot of a supercritical quasi-perpendicular shock front have been observed since the very early in situ observations of the terrestrial bow shock (Guha et al., 1972). The great attention that has been devoted to these type of waves since the first observations is explained by the key role attributed to them in the processes of energy redistribution in the shock front by various theoretical models. In some models, these waves play the role of the intermediator between the ions and electrons. It is assumed that they are generated by plasma instability that exist due to the counter-streaming flows of incident and reflected ions. In the second type of models, these waves result from the evolution of the shock front itself in the quasi-periodic process of steepening and overturning of the magnetic ramp. However, the range of the observed frequencies in the spacecraft frame are not enough to distinguish the origin of the observed waves. It also requires the determination of the wave vectors and the plasma frame frequencies. Multipoint measurements within the wave coherence length are needed for an ambiguous determination of the wave vectors. In the main multi-point missions such as ISEE, AMPTE, Cluster and THEMIS, the spacecraft separation is too large for such a wave vector determination and therefore only very few case studies are published (mainly for AMPTE UKS AMPTE IRM pair). Here we present the observations of upstream low frequency waves by the Cluster spacecraft which took place on 19 February 2002. The spacecraft separation during the crossing of the bow shock was small enough to determine the wave vectors and allowed the identification of the plasma wave dispersion relation for the observed waves. Presented results are compared with whistler wave dispersion and it is shown that contrary to previous studies based on the AMPTE data, the phase velocity in the shock frame is directed downstream. The consequences of this finding for both types of models that were developed to explain the generation of these waves are discussed.

Identification of low frequency waves in the vicinity of the terrestrial bow shock

2003 ◽  
Vol 51 (11) ◽  
pp. 693-702 ◽  
Author(s):  
M.A. Balikhin ◽  
O.A. Pokhotelov ◽  
S.N. Walker ◽  
M. Andre
Keyword(s):  
Low Frequency ◽  
Bow Shock ◽  
Low Frequency Waves

Ultra-low frequency foreshock waves at Venus and Mercury in a global hybrid simulation

2020 ◽  
Author(s):  
Riku Jarvinen ◽  
Esa Kallio ◽  
Tuija I. Pulkkinen
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Large Scale ◽  
Low Frequency ◽  
Hybrid Simulation ◽  
Bow Shock ◽  
Upstream Region ◽  
Ulf Waves ◽  
Solar Wind Interaction ◽  
Low Frequency Waves

<p>We study the solar wind interaction with Venus and Mercury in a 3-dimensional global hybrid simulation where ions are treated as particles and electrons are a charge-neutralizing fluid. We concentrate on the formation of large-scale ultra-low frequency (ULF) waves in ion foreshocks and their dependence on the solar wind and interplanetary magnetic field conditions. The ion foreshock forms in the upstream region ahead of the quasi-parallel bow shock, where the angle between the shock normal and the magnetic field is smaller than about 45 degrees. The magnetic connection with the bow shock allows backstreaming of the solar wind ions leading to the formation of the ion foreshock. This kind of beam-plasma configuration is a source of free energy for the excitation of plasma waves. The foreshock ULF waves convect downstream with the solar wind flow and encounter the bow shock. We compare the waves between Venus and Mercury, and analyze the coupling of the ULF waves with the planetary ion acceleration at Venus.</p> <p>References:</p> <p>Jarvinen R., Alho M., Kallio E., Pulkkinen T.I., 2020, Oxygen Ion Escape From Venus Is Modulated by Ultra-Low Frequency Waves, Geophys. Res. Lett., 47, 11, doi:10.1029/2020GL087462</p> <p>Jarvinen R., Alho M., Kallio E., Pulkkinen T.I., 2020, Ultra-low frequency waves in the ion foreshock of Mercury: A global hybrid modeling study, Mon. Notices Royal Astron. Soc., 491, 3, 4147-4161, doi:10.1093/mnras/stz3257</p>

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

scholarly journals On the existence of Alfvén waves in the terrestrial foreshock

2003 ◽  
Vol 21 (7) ◽  
pp. 1457-1465 ◽  
Author(s):  
J. P. Eastwood ◽  
A. Balogh ◽  
E. A. Lucek ◽  
C. Mazelle ◽  
I. Dandouras
Keyword(s):  
Low Frequency ◽  
Mhd Waves ◽  
Particle Interactions ◽  
Left Handed ◽  
Interplanetary Physics ◽  
Solar Wind Flow ◽  
Bow Shocks ◽  
Generation Mechanisms ◽  
The Waves ◽  
Low Frequency Waves

Abstract. The terrestrial foreshock is characterised by the existence of large amplitude ultra low frequency waves. The majority of such waves are observed to be left-handed in the spacecraft frame, but are in fact intrinsically right-handed and have been identified as fast-magnetosonic waves. More rarely observed are waves that are right-handed in the spacecraft frame. Cluster four spacecraft observations of such waves are presented and analysed using multi-spacecraft techniques; in particular the k-filtering/wave telescope technique is used. The waves are found to be left-handed and propagating sunwards in the plasma rest frame, and are, therefore, identified as Alfvénic. The convection of the waves anti-sunward in the solar wind flow causes the observed polarisation to be reversed. Generation mechanisms are discussed.Key words. Interplanetary physics (MHD waves and turbulence; planetary bow shocks) – Space plasma physics (wave particle interactions)

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