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Source characteristics and locations of hectometric radio emissions from the northern Jovian hemisphere
Author(s) -
Reiner M. J.,
Fainberg J.,
Stone R. G.
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl00245
Subject(s) - jovian , physics , northern hemisphere , astronomy , southern hemisphere , polarization (electrochemistry) , latitude , astrophysics , torus , magnetosphere , plasma , atmospheric sciences , planet , saturn , chemistry , geometry , mathematics , quantum mechanics
Northern Jovian hectometric (HOM) radio emissions, detected from high Jovian latitudes by the Unified Radio and Plasma Wave (URAP) experiment on the Ulysses spacecraft, were observed at all Jovian longitudes. This emission was observed to be predominantly right‐hand circularly polarized, but some left‐hand circular polarization was observed implying the presence of O mode emissions from the northern Jovian hemisphere. Intense HOM emissions, with well‐defined directions and polarizations, were often confined to similar longitudinal regions where intense HOM emissions were previously observed at low latitudes. The present analysis confirms that these northern HOM sources lie in the Jovian polar regions on magnetic field lines that pass through the Io plasma torus. The observations may be consistent with emission from either a filled cone beam or a longitudinal distribution of thin hollow cones.