[IGPP Everyone] Reminder - Friday - Space Physics Seminar - Spring Quarter 2017 - Fri.4/7/17 - 3:30pm Geology 6704

[Marjorie Sowmendran]

R E M I N D E R – Friday - April 7, 2017


SPACE PHYSICS SEMINAR

DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES

DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES

UNIVERSITY OF CALIFORNIA, LOS ANGELES

(AOS M275C, EPSS M288C)



Magnetosonic waves: fascinating spectral structures and importance to radiation belt electron dynamics



                                                                                       Jinxing Li

Department of Atmospheric & Oceanic Sciences

 UCLA, Los Angeles, CA



Abstract


The fast magnetosonic waves are fascinating because they exhibit many kinds of structures in spectrum. Despite the harmonic structures and the rising-tone structures, we report a new form of “zipper-like” magnetosonic waves consisting of two bands of interleaved periodic rising-tone spectra observed by multiple missions. The two discrete bands are distinct in frequency and intensity, however, they maintain the same periodicity which varies in space and time, suggesting a nonlinear excitation or modulation mechanism which still remains to be fully understood. Strong magnetosonic waves were observed in the same region and at the same time periods as the radiation belt electron butterfly distributions, and as the magnetosonic waves expand in space, the butterfly distributions extend to the same region. Our simulations successfully reproduced the formation of electron butterfly distributions, which result from parallel acceleration caused by Landau resonant interaction. Multi-case studies show that magnetosonic waves can create electron butterfly distributions at energies from ~100 keV to multi-MeV, in a wide spatial range (L=1.2-4.8) of the radiation belts.



Friday, April 7, 2017

Room 6704 Geology

3:30 - 5:00 PM

In-Charge: C. T. Russell 



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