Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993raincreptr....s&link_type=abstract
Final Report, 4 Jun. 1992 - 9 Jul. 1993 Radiophysics, Inc., Boulder, CO.
Astronomy and Astrophysics
Astronomy
Magnetic Dipoles, Magnetic Fields, Mathematical Models, Neptune (Planet), Radio Astronomy, Radio Emission, Direction Finding, Frequencies, Line Of Sight, Magnetic Poles, Polar Regions, Voyager 2 Spacecraft
Scientific paper
Smooth broadband radio emission reached a maximum and then cut off as Voyager approached the north magnetic pole of Neptune. The time of each event depends on frequency, yielding information on radio source location, and emission angle. In a preliminary analysis L-shell and magnetic longitude define radio-source locations in a dipole field. The emission angle at each frequency is identified with the angle between the magnetic-field direction at the source and the line of sight to Voyager 2 at the time of emission maximum. At each value of L in the range 6 less than L less than 9, there is one source longitude for which emission angle varies smoothly from greater or equal to 90 deg at 40 kHz to as low as 20 deg at 462 kHz. A more complex magnetic-field model can give a qualitatively different result.
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