Physics – Plasma Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmae11b..05y&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #AE11B-05
Physics
Plasma Physics
7500 Solar Physics, Astrophysics, And Astronomy, 7800 Space Plasma Physics, 7807 Charged Particle Motion And Acceleration
Scientific paper
We were able to generate the ring form in the laboratory by using two components fine particle plasmas (Dust Plasmas). This experiment will show one of the mechanisms of outer planets rings. The missions of Pioneer-10, 11, Voyager 1 and 2 revealed that micron and sub-micron size grains distribute spatially and that the Saturn rings were composed of small size dust particles. Dust particles are always charged by the influences of surrounding gaseous plasmas and UV radiations from the sun, so these particles are in the state of fine particle plasmas (dust plasmas). These particles prevail not only the influence of gravitational force only but the influence of electric and/or magnetic fields. This situation is believed and Mendis, Goertz et. al. investigated the dynamics of particles by introducing the gravitation and electrodynamics (gravito-electrodynamics). The gravitational force affects the influences charged and uncharged particles, equally. Charged particles (electric charge Q) are affected by F=Q(E+VXB), where V is particle velocity. Outer planets such as Saturn have magnetic fields like as earth, and these magnetized planets rotate around axis. The electric fields appear near a rotating magnetized sphere by an unipolar induction. Unipolar induction field E is given by E= -(wXr)XB using magnetic moment M of magnetized sphere at angular velocity w in a conducting medium (plasma). Within equatorial plane, B= - M/r3 and B=B0R3/r3, where R is the radius of planet and r is the distance from the center of the planet. This fields can be written as E=Pm/2r2T, by using Pm=4pr3B and T=2pw. The simulating condition can write as follows; where suffix S and M mean Saturn and miniature sphere, respectively. The created ring was located in the outskirts of the point from two to three times of sphere radius, and its thickness was very thin, and fine particle seem to rotate slowly around the sphere in same direction as rotation of sphere. The condition for creation was best fit with the estimated condition of simulation equation. Electric fields by unipolar induction is shown in Fig.2. It is clearly recognized that charged fine particles were trapped and co-rotated in the equatorial plane region. This fact indicates that the unipolar induction can play an important role for the ring creation of outer planets (Jupiter, Saturn, Uranus, and Neptune), in the early stage of solar system development.
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