scholarly journals Auroral ion acceleration from lower hybrid solitary structures: A summary of sounding rocket observations

1999 ◽  
Vol 104 (A12) ◽  
pp. 28515-28534 ◽  
Author(s):  
K. A. Lynch ◽  
R. L. Arnoldy ◽  
P. M. Kintner ◽  
P. Schuck ◽  
J. W. Bonnell ◽  
...  
Keyword(s):  
Sounding Rocket ◽  
Ion Acceleration ◽  
Lower Hybrid ◽  
Solitary Structures

scholarly journals Observations of lower hybrid cavities in the inner magnetosphere by the Cluster and Viking satellites

2004 ◽  
Vol 22 (8) ◽  
pp. 2961-2972 ◽  
Author(s):  
A. Tjulin ◽  
M. André ◽  
A. I. Eriksson ◽  
M. Maksimovic
Keyword(s):  
Time Scales ◽  
Sounding Rocket ◽  
Lower Hybrid ◽  
High Altitudes ◽  
Frequency Range ◽  
General Shape ◽  
Lower Altitude ◽  
Inner Magnetosphere ◽  
Hybrid Frequency ◽  
The Individual

Abstract. Observations by the Viking and Cluster satellites at altitudes up to 35000km show that Lower Hybrid Cavities (LHCs) are common in the inner magnetosphere. LHCs are density depletions filled with waves in the lower hybrid frequency range. The LHCs have, until recently, only been found at altitudes up to 2000km. Statistics of the locations and general shape of the LHCs is performed to obtain an overview of some of their properties. In total, we have observed 166 LHCs on Viking during 27h of data, and 535 LHCs on Cluster during 87h of data. These LHCs are found at invariant latitudes from the auroral region to the plasmapause. A comparison with lower altitude observations shows that the LHC occurrence frequency does not scale with the flux tube radius, so that the LHCs are moderately rarer at high altitudes. This indicates that the individual LHCs do not reach from the ionosphere to 35000km altitude, which gives an upper bound for their length. The width of the LHCs perpendicular to the geomagnetic field at high altitudes is a few times the ion gyroradius, consistent with observations at low altitudes. The estimated depth of the density depletions vary with altitude, being larger at altitudes of 20000-35000km (Cluster, 10-20%), smaller around 1500-13000km (Viking and previous Freja results, a few percent) and again larger around 1000km (previous sounding rocket observations, 10-20%). The LHCs in the inner magnetosphere are situated in regions with background electrostatic hiss in the lower hybrid frequency range, consistent with investigations at low altitudes. Individual LHCs observed at high altitudes are stable at least on time scales of 0.2s (about the ion gyro period), which is consistent with previous results at lower altitudes, and observations by the four Cluster satellites show that the occurrence of LHCs in a region in space is a stable phenomenon, at least on time scales of an hour.

A review of lower hybrid solitary structures

2003 ◽  
Vol 31 (6) ◽  
pp. 1125-1177 ◽  
Author(s):  
P.W. Schuck ◽  
J.W. Bonnell ◽  
P.M. Kintner
Keyword(s):  
Lower Hybrid ◽  
Solitary Structures

scholarly journals Theory, simulation, and observation of discrete eigenmodes associated with lower hybrid solitary structures

1998 ◽  
Vol 103 (A4) ◽  
pp. 6935-6953 ◽  
Author(s):  
P. W. Schuck ◽  
C. E. Seyler ◽  
J.-L. Pinçon ◽  
J. W. Bonnell ◽  
P. M. Kintner
Keyword(s):  
Lower Hybrid ◽  
Solitary Structures

scholarly journals Observation and analysis of lower hybrid solitary structures as rotating eigenmodes

1997 ◽  
Vol 102 (A8) ◽  
pp. 17283-17296 ◽  
Author(s):  
J. L. Pinçon ◽  
P. M. Kintner ◽  
P. W. Schuck ◽  
C. E. Seyler
Keyword(s):  
Lower Hybrid ◽  
Solitary Structures

scholarly journals Formation of lower-hybrid solitary structures by modulational interaction between lower-hybrid and dispersive Alfvén waves

2009 ◽  
Vol 27 (3) ◽  
pp. 1027-1033 ◽  
Author(s):  
J. O. Hall ◽  
G. Stenberg ◽  
A. I. Eriksson ◽  
M. André
Keyword(s):  
Numerical Solutions ◽  
Modulational Instability ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Lower Hybrid ◽  
Plasma Parameters ◽  
Thermal Electron ◽  
Cavity Collapse ◽  
Solitary Structures ◽  
Modulational Interaction

Abstract. We investigate the possibility that lower-hybrid solitary structures (LHSS), which are frequently observed in the Earth's ionosphere and magnetosphere, are formed as a result of a modulational interaction between lower-hybrid and dispersive Alfvén waves of initially small amplitude. A large amplitude lower-hybrid pump wave can excite density structures with length scales transverse to the geomagnetic field of the order of the ion gyroradius via a modulational instability. The structure formation in the nonlinear stage of the instability is investigated by numerical solutions of the governing equations, using plasma parameters relevant for LHSS observations in the upper ionosphere and in the magnetosphere. The numerical solutions reveal that the lower-hybrid waves become self-localized inside cylindrically symmetric (with respect to the ambient magnetic field) density cavities, in qualitative agreement with observations. Our model includes thermal electron effects but shows no stabilization at the ion sound gyroradius, suggesting that any preference of observed LHSS for that perpendicular scale likely is due to processes arresting the cavity collapse.

Nonlinear kinetic model for lower-hybrid solitary structures

2007 ◽  
Vol 14 (8) ◽  
pp. 082901 ◽  
Author(s):  
D. Jovanović ◽  
P. K. Shukla ◽  
G. Morfill
Keyword(s):  
Kinetic Model ◽  
Lower Hybrid ◽  
Solitary Structures ◽  
Nonlinear Kinetic

The AMICIST auroral sounding rocket: A comparison of transverse ion acceleration mechanisms

1996 ◽  
Vol 23 (23) ◽  
pp. 3293-3296 ◽  
Author(s):  
K. A. Lynch ◽  
R. L. Arnoldy ◽  
P. M. Kintner ◽  
J. Bonnell
Keyword(s):  
Sounding Rocket ◽  
Ion Acceleration
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