Evidence of auroral plasma cavities at Uranus and Neptune from radio burst observations

Details Evidence of auroral plasma cavities at Uranus and Neptune from radio burst observations Evidence of auroral plasma cavities at Uranus and Neptune from radio burst observations

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9619049f&link_type=abstract

Journal of Geophysical Research Supplement (ISSN 0148-0227), vol. 96, Oct. 30, 1991, p. 19,049-19,059.

Astronomy and Astrophysics

Astronomy

11

Auroral Zones, Neptune (Planet), Planetary Radiation, Radio Bursts, Uranus (Planet), Cyclotron Resonance, Magnetic Field Configurations, Magnetic Poles, Plasma Density, Voyager 2 Spacecraft

Scientific paper

Radio bursts originating from the stronger magnetic polar regions of both Uranus and Neptune were detected by the planetary radio astronomy experiment during the Voyager 2 encounters with the planets. It has previously been demonstrated that these bursts are beamed into a broad, hollow emission pattern from their auroral sources. It is now shown that the bursts at both planets also manifest similar detailed patterns, with the waves beamed into two separate and distinct radiation cones at intermediate wave frequencies. This double-cone emission pattern is predicted by relativistic cyclotron resonance theory, and application of this theory to the observed emission pattern yields the plasma density structure within the radio source region. Calculations indicate that at both Uranus and Neptune the plasma-to-cyclotron frequency ratio can drop well below 0.01 within the active region. Such low values indicate that the southern auroral zones at both planets contain an auroral plasma cavity that is similar to that found in earth's nightside auroral zone.

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