scholarly journals Van Allen Probes Observation of a Fundamental Poloidal Standing Alfvén Wave Event Related to Giant Pulsations

2018 ◽  
Vol 123 (6) ◽  
pp. 4574-4593 ◽  
Author(s):  
Kazue Takahashi ◽  
Seth G. Claudepierre ◽  
Robert Rankin ◽  
Ian R. Mann ◽  
Charles W. Smith
Keyword(s):  
Alfven Wave ◽  
Van Allen Probes ◽  
Wave Event ◽  
Giant Pulsations

Periodic modulation of the upper ionosphere by ULF waves as observed by SuperDARN radars and GPS/TEC technique

2020 ◽  
Author(s):  
Vyacheslav Pilipenko ◽  
Olga Kozyreva ◽  
Emma Bland ◽  
Lisa Baddeley
Keyword(s):  
Wave Interaction ◽  
Alfven Wave ◽  
Doppler Velocity ◽  
Electron Content ◽  
Ionospheric Layer ◽  
Total Electron ◽  
Responsible Mechanism ◽  
Wave Event ◽  
Magnetic Pulsations ◽  
Upper Ionosphere

<p>We compare the simultaneous magnetometer, SuperDARN radar, and GPS observations during Pc5 wave event on March 02, 2002. A possible correspondence between those instruments may help to determine the mechanism of the ionosphere modulation by magnetospheric disturbances. Transient Pc5 pulsations (2.6 mHz) in the morning sector, stimulated by the solar wind density jumps, have been detected simultaneously by ground magnetometers and the Kodiak and King Salmon SuperDARN radars.  Besides that, pulsations with the same periodicity have been found in the rate of total electron content (TEC), dTEC/dt (ROT), variations in several GPS radio paths. The ratio between the spectral amplitudes of the Doppler velocities and magnetic pulsations (X component) on the ground are Vx/Bx~7-12 (m/s)/nT and Vy/Bx~27 (m/s)/nT. The ratio between the oscillation amplitudes of ROT and ionospheric Doppler meridional (Vx) and azimuthal (Vy) velocities are ROT/Vx~0.02-0.07 (dTECu/min)/(m/s) and ROT/Vy~0.004 (dTECu/min)/(m/s). The correspondence between simultaneous periodic variations of the ionospheric Doppler velocity and geomagnetic field can be reasonably well interpreted quantitively on the basis of theory of Alfven wave interaction with the thin ionospheric layer. However, order-of-magnitudes estimates of possible TEC modulation mechanisms show that a responsible mechanism which can interpret the observed ratios has not been found yet. </p>

scholarly journals Van Allen probes, NOAA, GOES, and ground observations of an intense EMIC wave event extending over 12 h in magnetic local time

2015 ◽  
Vol 120 (7) ◽  
pp. 5465-5488 ◽  
Author(s):  
M. J. Engebretson ◽  
J. L. Posch ◽  
J. R. Wygant ◽  
C. A. Kletzing ◽  
M. R. Lessard ◽  
...  
Keyword(s):  
Local Time ◽  
Magnetic Local Time ◽  
Emic Wave ◽  
Van Allen Probes ◽  
Wave Event

Generation of the kinetic alfven wave and lower hybrid wave in space plasma

2001 ◽  
Vol 7 (2s) ◽  
pp. 59-66
Author(s):  
A.K. Yukhimuk ◽  
◽  
V.N. Fedun ◽  
Yu. Voitenko ◽  
E.K. Sirenko ◽  
...  
Keyword(s):  
Space Plasma ◽  
Alfven Wave ◽  
Lower Hybrid ◽  
Hybrid Wave ◽  
Lower Hybrid Wave ◽  
Kinetic Alfvén Wave ◽  
Kinetic Alfven Wave

The nonlinear interaction of the whistler wave with the inertial alfven wave in the magnetosphere of the Earth

2002 ◽  
Vol 8 (5-6) ◽  
pp. 96-101
Author(s):  
V.N. Fedun ◽  
◽  
A.K. Yukhimuk ◽  
A.D. Voitsekhovska ◽  
О.К. Cheremnykh ◽  
...  
Keyword(s):  
Nonlinear Interaction ◽  
Whistler Wave ◽  
Alfven Wave ◽  
Inertial Alfvén Wave ◽  
The Earth

Scattering of ordinary electromagnetic wave on the kinetic alfven wave

1999 ◽  
Vol 5 (1) ◽  
pp. 48-51
Author(s):  
A.K. Yukhimuk ◽  
◽  
V.A. Yukhimuk ◽  
O.G. Fal'ko ◽  
E.K. Sirenko ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Alfven Wave ◽  
Kinetic Alfvén Wave ◽  
Kinetic Alfven Wave

scholarly journals Electromagnetic power of lightning superbolts from Earth to space

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J.-F. Ripoll ◽  
T. Farges ◽  
D. M. Malaspina ◽  
G. S. Cunningham ◽  
E. H. Lay ◽  
...  
Keyword(s):  
Low Frequency ◽  
Optical Emission ◽  
High Energy ◽  
Very Low Frequency ◽  
Electromagnetic Power ◽  
Power Spectral ◽  
High Energy Tail ◽  
Van Allen Probes ◽  
Long Time ◽  
Low Frequency Waves

AbstractLightning superbolts are the most powerful and rare lightning events with intense optical emission, first identified from space. Superbolt events occurred in 2010-2018 could be localized by extracting the high energy tail of the lightning stroke signals measured by the very low frequency ground stations of the World-Wide Lightning Location Network. Here, we report electromagnetic observations of superbolts from space using Van Allen Probes satellite measurements, and ground measurements, and with two events measured both from ground and space. From burst-triggered measurements, we compute electric and magnetic power spectral density for very low frequency waves driven by superbolts, both on Earth and transmitted into space, demonstrating that superbolts transmit 10-1000 times more powerful very low frequency waves into space than typical strokes and revealing that their extreme nature is observed in space. We find several properties of superbolts that notably differ from most lightning flashes; a more symmetric first ground-wave peak due to a longer rise time, larger peak current, weaker decay of electromagnetic power density in space with distance, and a power mostly confined in the very low frequency range. Their signal is absent in space during day times and is received with a long-time delay on the Van Allen Probes. These results have implications for our understanding of lightning and superbolts, for ionosphere-magnetosphere wave transmission, wave propagation in space, and remote sensing of extreme events.

Alfvén wave forces, affecting the tokamak edge plasma in the presence of impurities or dust

1997 ◽  
Vol 4 (9) ◽  
pp. 3436-3438 ◽  
Author(s):  
V. S. Tsypin ◽  
S. V. Vladimirov ◽  
A. G. Elfimov ◽  
M. Tendler ◽  
A. S. de Assis ◽  
...  
Keyword(s):  
Edge Plasma ◽  
Alfven Wave ◽  
Wave Forces ◽  
Tokamak Edge

Resonances in submillimetric Alfvén wave propagation in Bismuth

1967 ◽  
Vol 5 (9) ◽  
pp. 719-722 ◽  
Author(s):  
D.L. Carter ◽  
J.C. Picard
Keyword(s):  
Wave Propagation ◽  
Alfven Wave

scholarly journals Numerical Simulations of a Gravity Wave Event over CCOPE. Part I: The Role of Geostrophic Adjustment in Mesoscale Jetlet Formation

1997 ◽  
Vol 125 (6) ◽  
pp. 1185-1211 ◽  
Author(s):  
Michael L. Kaplan ◽  
Steven E. Koch ◽  
Yuh-Lang Lin ◽  
Ronald P. Weglarz ◽  
Robert A. Rozumalski
Keyword(s):  
Numerical Simulations ◽  
Gravity Wave ◽  
Geostrophic Adjustment ◽  
Wave Event
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