Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2055s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2055
Physics
[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts
Scientific paper
Whistler mode emissions are very low frequency (VLF) waves in the Earth's magnetosphere that arise due to the interaction of whistler waves with radiation belt electrons. They have the characteristic feature of having typical frequencies of half the electron gyro-frequency at the geomagnetic equator with narrow band pulses lasting from milliseconds to a few seconds, and with saturation amplitudes of more than 30 dB. They also chirp in frequency. The amplification of these VLF waves has been studied both analytically and with simulations. However, while the analytic approaches have made use of the Hamiltonian equations for the electron motion, what has been missing is an analytical equation for the radiation field that brings closure to the problem of amplification of the whistler wave. Based on the similarities between free electron lasers (FELs) and whistler mode emissions, we present here a new set of closed relativistic equations. We show that these equations predict, through a cubic equation, whistler amplification levels well in agreement with those observed in the Earth's magnetosphere. We briefly discuss the implications of our formulation on the phenomenon of chirping of these modes. This research is supported by the DOE and NSF.
Bhattacharjee Anirban
Ng Cindy
Soto-chavez A.
No associations
LandOfFree
Whistler amplification: a free electron laser in the Earth's magnetosphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Whistler amplification: a free electron laser in the Earth's magnetosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Whistler amplification: a free electron laser in the Earth's magnetosphere will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1889402