Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...366..343b&link_type=abstract
Astronomy and Astrophysics, v.366, p.343-350 (2001)
Astronomy and Astrophysics
Astrophysics
2
Space Vehicles, Planets And Satellites: Jupiter, Radio Continuum: Solar System
Scientific paper
During 1994 and into 1996, Ulysses was at distances of 5 AU or more from Jupiter and travelling from south to north of the ecliptic plane. At these distances, the jovian broadband radio emission (bKOM) was only received occasionally by the Unified Radio and Plasma Experiment (URAP) on board the Ulysses spacecraft. The signals were generally weak and much care is needed to find and to identify the events. It is found that the visibility and polarization of the bKOM appears to depend upon the jovicentric latitude of Ulysses (D_Uly) at the time of observation. All but two of the bKOM events observed when Ulysses was at northern jovicentric latitudes were predominantly right-hand (RH) polarized while events recorded when the spacecraft was at southerly jovicentric latitudes were all predominantly LH polarized, the change taking place somewhere between 3.9deg<= D_Uly<= 8.8deg, close to 0deg jovimagnetic latitude. Compared with previous observations of the bKOM, made by spacecraft considerably closer to Jupiter, the present occurrence probabilities were lower for the LH polarized events although the distribution was similar. For the RH polarized events, however, the distribution was different, the so-called main peak being absent or, perhaps, displaced towards a larger central meridian longitude. It is shown that, in a two-dimensional model, if cyclotron maser emission in a dipole magnetic field is assumed for Jupiter, the detection of bKOM at a given frequency by a spacecraft at a specified location, determines a unique value of beta for an assumed value of L and a given field model. This is not true for a three-dimensional model. The present results raise questions on the application of the cyclotron maser theory to bKOM emission.
Barrow Colin H.
Lecacheux Alain
Macdowall Robert J.
No associations
LandOfFree
Jovicentric latitude effect on the bKOM radio emission observed by Ulysses/URAP does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Jovicentric latitude effect on the bKOM radio emission observed by Ulysses/URAP, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Jovicentric latitude effect on the bKOM radio emission observed by Ulysses/URAP will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-921237