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A theory for narrow-banded radio bursts at Uranus - MHD surface waves as an energy driverA possible scenario for the generation of the narrow-banded radio bursts detected at Uranus by the Voyager 2 planetary radio astronomy experiment is described. In order to account for the emission burstiness which occurs on time scales of hundreds of milliseconds, it is proposed that ULF magnetic surface turbulence generated at the frontside magnetopause propagates down the open/closed field line boundary and mode-converts to kinetic Alfven waves (KAW) deep within the polar cusp. The oscillating KAW potentials then drive a transient electron stream that creates the bursty radio emission. To substantiate these ideas, Voyager 2 magnetometer measurements of enhanced ULF magnetic activity at the frontside magnetopause are shown. It is demonstrated analytically that such magnetic turbulence should mode-convert deep in the cusp at a radial distance of 3 RU.
Document ID
19920050945
Document Type
Reprint (Version printed in journal)
Authors
Farrell, W. M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Curtis, S. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Desch, M. D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lepping, R. P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: A4, A
ISSN: 0148-0227
Subject Category
LUNAR AND PLANETARY EXPLORATION
Distribution Limits
Public
Copyright
Other