Right-Hand Polarized 4f_ce Auroral Roar Emissions: 2. Nonlinear Generation Theory

Authors

P. H. Yoon
J. LaBelle
Allan T. Weatherwax, Merrimack CollegeFollow

Document Type

Article

Publication Title

Journal of Geophysical Research: Space Physics

Publisher

American Geophysical Union

Publication Date

8-2016

Abstract/ Summary

Auroral roar emissions are commonly interpreted as Z (or upper hybrid) mode naturally excited by precipitating auroral electrons. Subsequent conversion to escaping radiation makes it possible for these emissions to be detected on the ground. Most emissions are detected as having left-hand (L) circular (or ordinary O) polarization, but the companion paper presents a systematic experimental study on the rare occurrence of the right-hand polarized, or equivalently, extraordinary (X) mode 4f_ce emission. A similar observation was reported earlier by Sato et al. (2015). The suggested emission mechanism is the nonlinear coalescence of two upper hybrid roars at 2f_ce. The present paper formulates a detailed theory for such an emission mechanism.

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