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Tracing Whistler waves in near-Earth space

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Title:
Tracing Whistler waves in near-Earth space
Creator:
Maxworth, Ashanthi ( Author )
Golkowski, Mark ( Mentor )
Place of Publication:
Denver, CO
Publisher:
University of Colorado Denver
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Conference poster

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Collected for University of Curacao's Institutional Repository by the UFIR Self-Submittal tool. Submitted by Matthew Mariner.
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Department of Electrical Engineering, CU Denver Electromagnetics and Plasma Physics Group, University of Colorado Denver

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Full Text
University of Colorado
Denver
Tracing Whistler Waves in near- Earth Space
Ashanthi Maxworth, Prof. Mark Golkowski,
Department of Electrical Engineering, CU Denver Electromagnetics and Plasma Physics Group, University of Colorado Denver
What are Whistler Waves?
Low frequency signals 1 kHz 30kHz
Naturally generated mainly due to lightning
strikes.
Creates a whistling sound when passed
through speaker, hence the name.
Precipitation
Region
Loss Cone
Electrons
Near-Earth Space
Earths Ionosphere and Magnetosphere
are in Plasma State.
Sensitive to temperature, solar effects and
space whether

0
@4
Near Earth Space environment Plasma: the 4th state of matter



r?



Why are Whistler Waves Important?
Whistler waves belong to most intense electromagnetic
waves in near earth space environment._______
Lightning Studies and Protection
Study Radiation Belt Dynamics
Protection of Space Electronics
Protection of Global Communication
Systems
Ray Tracing in Warm Plasma
Traces the power flow of a wave propagation through near
earth space environments.
Whistler waves have complicated trajectories.
Considering temperature effects makes the ray tracing
more complicated.
Cold Plasma
Warm Plasma
x (SM coordinates, in earth radii)
Frequency: 2.1kHz
Black: Cold Plasma
Red: Te=1ev, Ti=1ev
x (SM coordinates, In earth radii)
x (SM coordinates, in earth radii)
Frequency: 3kHz
Black: Cold Plasma
Red: Te=0ev, Ti=1ev
Frequency: 9kHz
Black: Cold Plasma
Red: Te=1ev, Ti=0ev
How significant are the
temperature effects?
Temperature effects can change the
propagation path entirely.
With temperature effects, whistler waves
confine inside the magnetosphere without
reaching the earth.
f-3.5kHz \v = 3CP
f= 3.5kHz y = 55
x (SM coordinates, in earth radii)
x (SM coordinates, in earth radii)
x (SM coordinates, in earth radii)
Black: Cold Plasma
Red: warm plasma
earth
Summary
Whistler wave propagation in the near
space environment is a very important
phenomenon.
Near earth space environment is in plasma state.
Tracing the path of whistler waves has many
practical applications.
Temperature effects can change the ray path
significantly.
In our work we study the effect of temperature in
whistler wave tracing.
Main References
J. Bortnik, Precipitation of Radiation belt Electrons by Lightning Generated
Magneto-spherically reflecting Whistler Waves, Stanford University, 2005.
P. Kulkarni et al, Whistler Mode Illumination of the Plasmaspheric Resonant Cavity
via in situ Injection of ELF/VLF waves, J. of Geophysical Research, vol 111,
A10215, 2006.
P. Kulkarni et al, The Effect of Electron and Ion Temperature on the Refractive
Index Surface of 1-10kHz Whistler mode waves in the Inner Magnetosphere, J. ofy
Geophysical Research, doi: 10.1002/2014JA020669


Full Text

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What are Whistler Waves? Low frequency signals 1 kHz 30 kHz Naturally generated mainly due to lightning strikes Creates a whistling sound when passed through speaker, hence the name Why are Whistler Waves Important? How significant are the temperature effects? Near Earth Space are in Plasma State. Sensitive to temperature, solar effects and space whether Plasma: the 4 th state of matter Traces the power flow of a wave propagation through near earth space environments. Whistler waves have complicated trajectories. Considering temperature effects makes the ray tracing more complicated. Ray Tracing in Warm Plasma Tracing Whistler Waves in near Earth Space Ashanthi Maxworth Prof. Mark Golkowski Department of Electrical Engineering, CU Denver Electromagnetics and Plasma Physics Group, University of Colorado Denver Summary University of Colorado Denver Main References Near Earth Space environment Study Radiation Belt Dynamics Lightning Studies and Protection Protection of Space Electronics Protection of Global Communication Systems Cold Plasma Warm Plasma Temperature effects can change the propagation path entirely With temperature effects, whistler waves confine inside the magnetosphere without reaching the earth Whistler wave propagation in the near earth space environment is a very important phenomenon Near earth space environment is in plasma state Tracing the path of whistler waves has many practical applications Temperature effects can change the ray path significantly In our work we study the effect of temperature in whistler wave tracing J Bortnik of Radiation belt Electrons by Lightning Generated Magneto spherically reflecting Whistler Stanford University, 2005 P Kulkarni et al, Mode Illumination of the Plasmaspheric Resonant Cavity via in situ Injection of ELF/VLF J of Geophysical Research vol 111 A 10215 2006 P Kulkarni et al, Effect of Electron and Ion Temperature on the Refractive Index Surface of 1 10 kHz Whistler mode waves in the Inner J of Geophysical Research doi : 10 1002 / 2014 JA 020669 Whistler waves belong to most intense electromagnetic waves in near earth space environment. Frequency: 2.1kHz Black: Cold Plasma Red : Te =1ev, Ti =1ev Frequency: 3kHz Black: Cold Plasma Red : Te =0ev, Ti =1ev Frequency: 9kHz Black: Cold Plasma Red : Te =1ev, Ti =0ev Black: Cold Plasma Red : warm plasma