A Searchlight Beam Model of Jupiter's Decametric Radio Emissions

Details A Searchlight Beam Model of Jupiter's Decametric Radio Emissions A Searchlight Beam Model of Jupiter's Decametric Radio Emissions

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm41b1673i&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM41B-1673

Mathematics

Probability

1

2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2756 Planetary Magnetospheres (5443, 5737, 6033), 2772 Plasma Waves And Instabilities (2471), 6220 Jupiter, 7534 Radio Emissions

Scientific paper

It has long been recognized that there is a marked long-term periodic variation in Jupiter's integrated radio occurrence probability. The period of the variation is on the order of a decade. Carr et al. [1970] showed that such variations are much more closely correlated with Jovicentric declination of the Earth (De). The range of the smoothed variation of De is from approximately +3.3 to -3.3 degrees. This De effect was extensively studied and confirmed by Garcia [1996]. It shows that the occurrence probability of the non-Io-A source is clearly controlled by De at 18, 20, and 22 MHz during the 1957-1994 apparitions. We propose a new model to explain the De effect. This new model shows that the beam structure of Jupiter radio emissions, which has been thought of like a hollow-cone, has a narrow beam like a searchlight, which can be explained by assuming that the three dimensional shape of the radio source expands along the line of the magnetic field. Various computer graphics illustrate the concept of this searchlight beam model.

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