An anomalous component of Neptune radio emission - Implications for the auroral zone

Details An anomalous component of Neptune radio emission - Implications for the auroral zone An anomalous component of Neptune radio emission - Implications for the auroral zone

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1401d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1401-1408.

Astronomy and Astrophysics

Astronomy

9

Auroral Zones, Neptune Atmosphere, Planetary Magnetospheres, Radio Astronomy, Radio Emission, Planetary Magnetic Fields, Planetary Rotation, Voyager 2 Spacecraft, Neptune, Radiowaves, Emissions, Anomalies, Auroras, Patterns, Symmetry, Spacecraft Observations, Voyager 2 Mission, Pra Instrument, Magnetosphere, Dipole Moment, Frequencies, Source, Origin, Magnetic Field, Diagrams, Polarization, Magnetic Pole

Scientific paper

The Voyager planetary radio astronomy experiment detected a bursty, narrow-band radio emission originating in Neptune's magnetosphere. The time of occurrence of nearly all of the episodes of this bursty radio emission can be explained on the basis of a radio source located just above and to the east of the south magnetic offset tilted dipole (OTD) tip (Farrell et al., 1990). However, several episodes of bursty emission do not occur at the usual frequency and planetaray rotation phase for emissions of this type. The occurrences of these rarely seen anomalous episodes are shifted systematically in planetary longitude so as to be consistent with a source of emission to the southwest of the southern magnetic OTD pole. Owing to the proximity of these sources to the magnetic polar region, they are associated with an active auroral region. Therefore, at least from the standpoint of the radio emission, the picture that emerges is of an auroral zone with two emission hot spots approximately diametrically east and west of the south magnetic pole. The possibility of a complete radio-active auroral oval is discussed.

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