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Local time dependence of Jovian radio emissions observed by Galileo
Author(s) -
Menietti J. D.,
Gurnett D. A.,
Kurth W. S.,
Groene J. B.
Publication year - 1999
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 - 10.1029/1999gl900047
Subject(s) - jovian , jupiter (rocket family) , local time , physics , galileo (satellite navigation) , substorm , range (aeronautics) , orbit (dynamics) , astronomy , midnight , magnetosphere , daytime , astrophysics , radio wave , geophysics , plasma , atmospheric sciences , geology , planet , geodesy , spacecraft , statistics , mathematics , saturn , materials science , quantum mechanics , aerospace engineering , engineering , composite material
Galileo has been in orbit around Jupiter since December 1995. All the orbits are equatorial and elliptical, with apogees between 60 R J –142 R J and perigees from 8–12 R J . Since orbit injection, the plasma wave instrument (PWS) has been collecting data over specific intervals of each of the orbits at all local times and a range of different radial distances. We present the results of a survey of the data for the frequency range 300 kHz to 5.6 MHz, which includes the hectometric (HOM) and low‐frequency decametric (DAM) emissions. The results indicate that both the HOM and DAM emission are more intense and occur more frequently in the midnight sector of Jupiter. This is in analogy to Earth and consistent with a magnetic substorm source for a portion of the radio emissions in this frequency range. Another peak in the power levels is observed on the Jovian dayside in the local time range 11 hrs.