Magnetoinertial Oscillations of Jupiter's Inner Radiation Belt

Details Magnetoinertial Oscillations of Jupiter's Inner Radiation Belt Magnetoinertial Oscillations of Jupiter's Inner Radiation Belt

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...548..460l&link_type=abstract

The Astrophysical Journal, Volume 548, Issue 1, pp. 460-465.

Astronomy and Astrophysics

Astronomy

5

Acceleration Of Particles, Magnetohydrodynamics: Mhd, Planets And Satellites: Individual: Jupiter, Radiation Mechanisms: Nonthermal, Sun: Solar Wind, Waves

Scientific paper

Quasi-periodic 40 minute (QP-40) bursts of both relativistic electrons (energy E~10 MeV) and radio emissions (frequency ν<~700 kHz) from the south Jovian pole were detected by the instrument onboard the Ulysses spacecraft at high jovigraphic latitudes (~30-40 S°). We show here that Jupiter's inner radiation belt (IRB) may oscillate globally with a quasi-period of ~40 minutes or so and propose that, as results of asymmetries and small-scale circumpolar magnetic irregularities/anomalies, a fraction of relativistic electrons normally trapped within the IRB may go astray from a roughly circular zone surrounding the Jovian magnetic pole during certain phases of such IRB magnetoinertial oscillations. The escaped relativistic electrons rapidly convert their transverse motions to (anti)parallel motions along the magnetic field lines by the mirror force. The observed QP-40 radio bursts are closely associated with such QP-40 leaks of relativistic electrons in near-antiparallel motions. Our prediction for QP-40 magnetoinertial oscillations of the IRB can be tested by directly observing variations of IRB decimetric brightness using ground-based radio telescopes, especially upon the arrival of high-speed solar winds at Jupiter. Several relevant aspects of this scenario are also discussed.

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